1. Introduction
Natural product-based medication has been a source of treatment for various ailments for thousands of years [1]. Herbal medicines have long played a vital role in developing drugs to treat a variety of diseases. Currently, available medicines are distinctions or reproductions of constituents, combinations, and dilutions that exist in nature [2]. People’s interest in herbal medicines is currently increasing due to fewer or no side-effects [3]. Despite the minimal risk of adverse effects, the possibility of a medication interaction cannot be rejected. Another appealing attribute for accepting a comprehensive collection of herbal medications is cost-effectiveness. The use of herbal medicines is historical, but there is a space in ancient traditional practices fulfilled by alternative medicine and complementary medicines incorporating new technologies [4,5,6]. Therefore, we should continue to research new plant-based therapy from the vast reservoir of nature [7,8].
Tamaricaceae (Caryophyllales) is a family of around 80 rheophytes, halophytes, and xerophytes grown in semi-arid and dry regions, especially in central and southwest Asia [9,10]. It is a native plant of African and Asian countries used by the locals for medicinal purposes and is commonly called tamarisk [11,12]. This plant has needle-like leaves coated in salt secreted by the salt glands [13]. The leaf attachment on the stem and the shape of the androecium are the most significant distinguishing features of Tamarix species: shrubs and trees. Some morphological characteristics have intermediate states of Tamarix; therefore, it is the most taxonomically challenging genus among angiosperms [9,10]. The reported phytochemical work on Tamarix species has shown that the main chemical constituents are polyphenolic constituents such as flavonoids, tannins, and phenolic acids [12]. The phytochemical research revealed that all extracts were noticeably devoid of alkaloids, followed by the presence of tannins. In addition, different parts of the plant have reported flavonoids, steroids, cardiac glycosides, and derivatives of ellagic acid and gallic acid [14,15,16,17,18,19]. T. aphylla has long been used as an antipyretic, analgesic, antirheumatic, and anti-inflammatory. Gall extract has been used for throat infections and temporarily constricting the vaginal mucous membrane before intercourse [4,14,20,21,22]. The bark of this plant is used to cure skin-related diseases, and gall on the flowers is used for its astringent effect [23]. There are various folk uses such as carminative, eczema, antimicrobial, antioxidant, aphrodisiac, anthelmintic, diuretic, anti-hemorrhoid, antidiarrheal, and skin diseases. In addition, many other studies have exhibited activities toward inflammation, joint pain, and internal tumors [20,24]. A complete overview of the T. aphylla’s ethnobotanical, phytochemical, and pharmacological potential is shown in Figure 1.
In this work, we reviewed the available research on T. aphylla and determined whether modern investigation into the various properties such as antidiabetic, antibacterial, anti-inflammatory, wound-healing, antifungal, and anticholinesterase activities of this plant validates its use to treat these diseases. This article reviews past T. aphylla research findings and identifies knowledge gaps that need to be addressed to fully grasp the mechanism of action of T. aphylla extracts in the treatment of various illnesses. In addition, the review covers phytochemistry and toxicological studies, highlighting the need for more research to back up the existing data and find new applications for this intriguing plant.
2. Material Methods
In the current review article, the information was collected from a literature search using various computerized databases such as PubMed, Google Scholar, Scopus, ScienceDirect, and Saudi Digital Library. Keywords such as Tamarix aphylla, T. aphylla, Tamarisk, Tamarix spp, Tamarix ethnomedicinal use, and ethnopharmacological aspects were used to search literature. In addition, keywords antimicrobial activity, biological activity, pharmacological properties, antifungal, cytotoxicity, anti-inflammatory, phytochemistry, phytochemical components, toxicology, anticholinesterase activity, and anticholinesterase effect with respect to T. aphylla were used to search literature. Furthermore, different phrases such as “genus Tamarix in chronic diseases”, “Tamarix species in chronic disease”, “Tamarix aphylla in diabetic disease”, “Tamarix aphylla in cytotoxicity”, “analgesic activity of Tamarix aphylla”, “anticholinesterase activity of Tamarix aphylla”, “Tamarix aphylla role in inflammatory diseases”, “Tamarix aphylla role in periodontal disease”, “antifungal activity of Tamarix aphylla”, “antibacterial activity of Tamarix aphylla”, and “wound-healing activity of Tamarix aphylla” were used to search the literature related to chronic diseases. In addition, further information was retrieved from various botanical books.
3. Ethnopharmacology: Traditional Practices
T. aphylla (Tamaricaceae) is the most well-known Tamarix species, reaching up to 18 m (60 feet) high. This plant is known with different names such as saltcedar, Athel tree, Athel tamarisk, and Athel pine. It is a treasure of various regions of the world including Central Africa, the Middle East, and Asia. Species of Tamarix grow in dry and hot climates, while some of its species are also found in moderate temperatures [12,13,25]. Ethnopharmacological reports on T. aphylla are presented in Table 1.
Most ethnopharmacological studies were published in Pakistan. These studies have shown that T. aphylla is used to treat various infectious diseases, including dental infections, smallpox, leprosy, tuberculosis, colds, and coughs [26,27,28]. Many other communications from other parts of the world have established that T. aphylla has antidiabetic, antibacterial, anti-inflammatory, and antifungal properties, in addition to being effective in periodontal disease, along with anticholinesterase and wound-healing activities. These activities are due to the tremendous number of phenolic compounds with astringent effects. Tamarix aphylla, together with the Aerva javanica plant, was studied ethnobotanically, chemically, and biologically in the Asir region of Saudi Arabia. The study claimed that both plants had a high usage value (UV), indicating knowledge of the medical relevance and uses of these plants. In the plains and valleys (wadis) of the Asir region, T. aphylla is ubiquitous, natural, and well-grown. T. aphylla’s different parts were reported to be used in various ailments, including joint pain, skin issues, and kidney problems. Plants with a high UV reflect their extensive use by locals in the area with several therapeutic effects toward human health issues. As a result, the author reported that bioactive phytochemicals and other pharmacological actions should be investigated in these plants [29].
Islamic religious scripture, Holy Quran, recognizes T. aphylla with names such as Athel or Tarfaa. As a useful traditional phytotherapy for jaundice, T. aphylla leaf ash is mixed with water, which is filtered and boiled after half an hour. Salt is left behind after water evaporation, of which 0.5–1 g is consumed with Shurbat-e-Bazoori twice daily [23]. Traditionally, the plant is known as “Mayyin Khurd” in Unani, Macheeka in Ayurveda, and Sivappattushavukku in Siddha, among other names. According to the history of folk medicinal usage, the plant has been used for antirheumatic, analgesic, and antipyretic purposes [4]. The folkloric assertion shows the use of T. aphylla in fever, inflammation, and pain, in addition to antimicrobial, antidiarrheal, anti-hemorrhoid, and antioxidant activities, along with use in eczema and skin diseases, as well as an aphrodisiac, diuretic, carminative, and anthelmintic [21,23,24].To cure wounds, abscesses, and rheumatism, the leaves are boiled in water, and water is strained; then, hot leaves are tied with the affected area. This therapy is continued for a week. The galls are astringent, and their aqueous extract is used as a gargle to cure throat infections. An extract of the leaves is used to treat toothache [14,30]. Ethnobotanical uses include the treatment of ulcer, GIT disorders, epilepsy, hair loss, and various dermatological problems [31,32]. There is a definitive history of using root decoctions to cure contagious ailments, such as smallpox, tuberculosis, and leprosy. The tree’s young branch and leaf decoction are used for tetanus, spleen, and gynecological problems [33].
Tamarix aphylla grows widely in diverse parts of the world; therefore, its vernacular names differ: German, Tamariske; Spanish, Taray; French, Tamaris; Arabic, Abal, Tarfaa, Ghaz, and Athel; Afrikaans, Woestyntamarisk; English, Athel pine, saltcedar, Tamarix, tamarisk, desert Tamarix, Athel tamarisk, and Athel tree [42,43,44].
4. Phytochemistry
This section of the review describes the structures of many secondary metabolites of T. aphylla and the functions of these metabolites in plants and humans. These compounds can be divided into four major biosynthetic classes: phenylpropanoids, terpenoids, alkaloids, and polyketides. The study of phytochemicals has led to drug discovery. The available literature on T. aphylla focuses on the characterization and isolation of particular parts of this plant [14,18,45,46]. A combination of phenolic chemicals characterizes this plant material [47]. There are several uses of T. aphylla, and its preparations are used as natural remedies to treat many diseases. Unfortunately, most of the studies have not thoroughly investigated the phytochemicals of T. aphylla. Most research has been conducted on the structural characterization and isolation of chemical components, including gallic acid, ellagic acid, and flavonoids [14,18,45,47,48,49]. Tannins and flavonoid-rich sources have been found in T. aphylla leaves [50].
Flavonoids and alkaloids extracted from T. aphylla have been examined for antibacterial activity. Phytochemical screening of most extracts of T. aphylla has exhibited the presence of tannins and a lack of alkaloids. Bioactive mixtures and metabolites have been found, such as cardiac glycosides, flavonoids, terpenoids, and steroids. Gallic and ellagic acid are derivatives of this plant species [15,16,17,19]. The leaves and stems of T. aphylla have a comparable phytochemical composition. Nevertheless, quantitative analyses have indicated that the leaves have a considerably greater quantity of polyphenols than the stems [17]. A floral extract of T. aphylla yielded isoferulic acid, 3-O-beta-glucopyranoside, glycosylated isoferulic acid, and novel phenolics such as dehydrodigallic acid dimethyl ester and tamarixetin 3,3’-disodium sulfate. According to the spectral data, their structures were developed [18]. Various studies have shown structural derivatives among hydrolyzable tannins [51]. T. aphylla galls, on the other hand, generate the ellagitannin tamarixellagic acid [49]. According to a study, under an abiotic stress environment, a halophytic plant stimulates oxidative stress reactive oxygen species in hostile conditions. Therefore, time and collection area are factors that may significantly change the amounts of secondary metabolites [17,49,52]. Table 2 lists a few important secondary metabolites of T. aphylla.
5. Pharmacological Efficacy of Tamarix aphylla
5.1. Anti-Inflammatory Activity
Inflammation is the body’s reaction to fight burns, injuries, toxic stimuli, and infections that emerge as anorexia, fever, and edema. Inflammation is the body’s first defense reaction that removes undesirable effects and commences the healing operations. This protective system is crucial for a healthy and normal physiological state. Inflammation can be acute or chronic [58,59]. Removing the damaged stimuli is the treatment of acute inflammatory conditions; however, unchecked acute inflammation can lead to chronic inflammation. A chronic inflammatory response can cause serious health problems, such as neurological and cardiovascular diseases and cancer [60]. Alzheimer’s disease, cardiovascular disease, metabolic disorders, allergies, malignancies, and autoimmune illnesses all have chronic inflammation as a contributing factor [61]. Anti-inflammatory medications, both nonsteroidal and steroidal, are the most prescribed treatments. In most documented cases, the long-term use of these medicines is hampered by their side-effects, necessitating the therapeutic use of less toxic solutions with fewer unpleasant responses [62,63]. Consequently, there is a requirement for effective, safe, and cost-effective alternative therapies.
Herbal therapy has been used to treat various ailments since ancient times, including chronic inflammatory diseases. Medicinal plants contain anti-inflammatory properties and have limited or no adverse effects [3]. T. aphylla is generally safe and harmless to humans. However, inflammation is a significant development in many illnesses [64]. Consequently, there is a persistent need to learn more about the benefits of natural medications in treating inflammatory diseases to expand our scientific awareness. Tamarix species possess various compounds such as phenolic acids, tannins, sulfur-containing compounds, and flavonoids, which have been used since ancient times to cure chronic inflammatory disorders [11,12]. T. aphylla is an encouraging herbal medication with a wide range of metabolites, many medical uses, and pharmacological assurance. The aqueous ethanolic extract of T. aphylla galls has been shown to have anti-inflammatory and antipyretic properties [4]. The inflammatory pathway and probable role of T. aphylla as an anti-inflammatory drug are illustrated in Figure 2.
An investigation was carried out to examine the modulatory effect of T. aphylla, in which bioassay-guided isolation was carried out on several inflammatory indicators such as TNF-α and ROS, proliferation of lymphocyte T cells, and proinflammatory cytokines. The aqueous extract of T. aphylla suppressed intracellular ROS production, NO generation, and T-cell proliferation. The most effective inflammatory markers were the liquid–liquid fractional method partitioned aqueous ethanolic crude extract and n-BuOH and DCM extracts. In addition, 3,5-dihydroxy-4-methoxy benzoic acid methyl ester from the DCM extracts suppressed the generation of ROS and TNF-α. Furthermore, all mediators examined demonstrated inhibitory action in the presence of kaempferol. Therefore, T. aphylla constituents might be used as anti-inflammatory medications [63].
5.2. Wound-Healing Activity
The sequence of interconnected processes that replace damaged tissue at the injury site with newly produced tissue is called wound healing. Regular biological action is attained through four remarkably programmed stages: hemostasis, inflammation, proliferation, and remodeling. All four stages must happen in a certain time frame with a proper sequence to heal the wound. Many factors affect the process of wound healing, such as infection, oxygenation, sex hormones, age, stress, obesity, alcoholism, nutrition, smoking, and diabetes [65]. Various studies have proven that natural products affect all these factors. Natural therapeutics promote wound healing and fix impaired wounds with lessened side effects. Natural products have been used since ancient times to heal wounds due to their pharmacological importance, such as antibacterial, anti-inflammatory, and cell-stimulating potential [66]. The effectiveness of these natural products has been examined through in vitro, in vivo, and human studies. Skin wound healing is a perplexing biological activity and a coordinated cellular and biochemical sequence. Combining herbal materials with advanced drugs has improved regeneration [67].
T. aphylla’s anti-inflammatory and wound-healing properties are reported in Islamic literature and other resources from far-flung regions of Saudi Arabia. In the Al-Qassim region of Saudi Arabia, dried powders of all plant parts are used for 1 week to treat camel skin disorder (allergic or mycotic dermatitis) [68]. Burnt smoke from the dried pulverized plant leaves has history as an injury-healing agent and a dental painkiller [30]. It was found that boiling plant leaves and tying them to afflicted skin manages abscesses and rheumatism, in addition to wound healing [23]. An animal study examined an ethanolic extract of T. aphylla for wound-healing activity. A linear incision and a circular excision were employed to assess wound healing. Total protein estimation, antioxidant activity, lipid peroxides, uronic acid, hexosamine, and the tensile strength of tissue from incision wounds were examined. The period of epithelialization and TNF-α concentration of the wound tissues were also assessed in this study. Compared to conventional medication, the extract treatment groups exhibited considerable antibacterial activity. Results of the study showed that T. aphylla extract substantially enhanced the collagen content and remarkably increased tensile strength. T. aphylla extract has been shown to prevent oxidative damage, speed up healing activity, and have potent antioxidant properties. The epithelialization duration of the treated wounds was reduced by 40%. The study’s findings showed that the ethanolic extract of T. aphylla has strong wound-healing ability [69]. Another study investigated the wound-healing potential of T. aphylla extract by adopting the induced paw edema model in Wistar rats. In addition, the gel base of a T. aphylla extract, namely, Carbapol-934, was employed to investigate carrageen-induced anti-inflammatory properties. This examination showed that T. aphylla has wound-healing, anti-inflammatory, and antioxidant properties [70]. There is an urgent need to determine the actual mechanism of action, the safety, and the adverse effects of T. aphylla and its secondary metabolites; furthermore, there is a demand for revamped purification techniques, innovative extraction methods, and quality control evaluation with treatment regimes. Although T. aphylla is less expensive than current therapies, it is susceptible to geographic location, season, and batch-to-batch fluctuation, resulting in unanticipated allergic responses and adverse effects. The possible mechanism of T. aphylla wound-healing activity is shown in Figure 3.
5.3. Antibacterial Activity
In tropical and subtropical areas, human diseases, particularly those involving microorganisms such as bacteria, fungus, viruses, and nematodes, inflict significant harm. Over the last two decades, there has been a surge in interest in natural products as potential sources of novel antimicrobial agents. Consequently, various extracts from conventional herbal drugs have been examined to discover numerous pharmacological benefits [71,72,73]. Moreover, there is a need for novel herbal extracts and natural medicines that might effectively resist bacteria [71,74]. The antibacterial properties of plant phytochemicals have demonstrated their therapeutic usefulness in treating bacterial infections [75,76]. Therefore, documentation of the constituents and antibacterial activity of medicinal plants is precious since it may be utilized to conduct additional research to develop innovative antibacterial treatments.
Therefore, it is necessary to explore the phytochemical constituents of T. aphylla to treat infections [77]. This section aims to explore the antibacterial activities of extracts and secondary metabolites of T. aphylla to bridge existing research gaps, to provide suggestions based on the current understanding of T. aphylla’s advantages, and to advise more scientific research for innovative antibacterial treatments. All the secondary metabolites of T. aphylla listed in this review have medicinal properties, thus authenticating their usage [78]. For future study and the formation of new antibiotics to fight resistant pathogenic bacteria, all related studies of T. aphylla are discussed.
The antibacterial activity of a methanolic extract of T. aphylla bark against microbial strains in a study provided scientific evidence for the use of its phytoconstituents as an antimicrobial treatment. Halophytic species with stimulant and hepatotoxic properties are used to treat liver-related ailments. Halophytic species suppressed all bacterial strains, leaving Listeria monocytogenes, and studies have shown that polar methanolic fractions are more effective than polar chloroform fractions [79]. A study was conducted to test the antibacterial activity against 10 pathogenic bacteria implicated in severe ailments affecting humans and animals. Fresh and disease-free T. aphylla leaves were accumulated from Saudi Arabia’s various geographical locations. The antibacterial screening effectiveness of T. aphylla leaves against multidrug-resistant human infections was studied in vitro. The antibacterial effects of the methanol and ethanol leaf extracts were different and showed varying inhibitory effects against the examined pathogenic strains, ranging from modest inhibition (4 ± 0.6 mm) to high inhibition (20.7 ± 1.3 mm). There were no significant variations in the lowest inhibitory concentrations of ethanol and methanol extracts. T. aphylla contains antibacterial biomolecules that might be used to combat multidrug-resistant human infections [80]. The methanolic extract of T. aphylla and its phytochemical constituents were explored in vitro for antibacterial activity against various microbial strains. The disc diffusion assay with 25, 50, 75, and 100 mg/mL stock solutions was employed to examine the antibacterial activity toward Escherichia coli, Bacillus subtilis, Salmonella typhi, and Staphylococcus aureus, in addition to antifungal activity toward strains such as Aspergillus flavus and Candida albicans. The extract’s inhibitory efficacy in millimeters was calculated by measuring the zone of growth inhibition surrounding the discs and comparing it to the reference medication. The study showed that T. aphylla bark extract has a more significant inhibition zone at higher concentrations [81]. These compelling results can motivate health workers to use bioactive materials and phytoconstituents.
Biofilms are multispecies bacterial colonies that invade the oral cavity as plaque, causing dental cavities and periodontal disease [82]. In one study, three herbs were examined to determine their effectiveness against pinpointed dental biofilm-forming bacteria. Pathogenic strains that form dental biofilms were isolated, grown, and evaluated using PCR-based 16S ribosomal RNA (or 16S rRNA) nucleotide sequences. T. aphylla L., Melia azadirachta L., and Acacia arabica were the three crucial medicinal plants investigated to determine their antibacterial activity toward biofilm-forming strains. The findings showed that extracts of these three medicinal plants can be utilized against pathogenic bacteria that cause dental biofilms, and pharmaceutical companies should include them in dental care products [27]. The leaves of T. aphylla have been characterized as a rich source of tannins and flavonoids [50]. Kaempferol is a phytochemical found in T. aphylla. It has several therapeutic properties such as anticancer and antioxidant activities, while its usage is limited because of low permeability and poor solubility [83]. Kaempferol and resveratrol are two phenolic compounds that have shown antimicrobial activity. Therefore, researchers have employed two methods, time to kill and checkerboard, to evaluate this property. Studies showed that both compounds inhibited growth in MHB (Muller–Hilton broth) and milk according to the time-to-kill method [84]. In another study, T. aphylla suppressed the increase in microorganisms such as S. aureus and P. aeruginosa [69]. The possible antibacterial mechanism of T. aphylla is shown in Figure 4.
5.4. Antifungal Activity
Fungal infections are among the most dangerous diseases, killing around 1.5 million humans each year worldwide [85]. Infection of the skin ranks fourth among all fungal illnesses, and it also accounts for the bulk of deaths [86,87]. In the last several years, there has been an increase in the frequency of fungal illnesses and the resistance of specific fungus species to various fungicides used in medicine. Furthermore, fungi are among the most underappreciated diseases, while the reality is that amphotericin B and alternative commercially available antifungal therapies are still considered the gold standard. However, antifungal medicines have various side-effects such as toxicity, effectiveness, price, and extensive usage, resulting in resistant strains [88]. Resistance to antifungal medications has become a common issue because of their overuse. Therefore, plant-based therapies have piqued the interest of experts as a potential therapy for fungal infections [5]. The plant world has long been a hotbed for numerous natural chemicals with unique structures, which has piqued researchers’ curiosity in studying various plant species to this day. Numerous studies have shown that plants are a source of bioactive secondary metabolites, such as alkaloids, terpenoids, and saponins, all of which have demonstrated antifungal activities [89]. Traditional systems of medicine have also reported that medicinal herbs are fruitful candidates for treating animal and human mycoses. Furthermore, they can be used to develop novel antifungal drugs [88]. Accordingly, this section aims to explain the current situation regarding T. aphylla and its antifungal compounds, which may help to develop more effective antifungal medicines in the future.
A study was conducted to determine the effectiveness of ethanolic extracts of T. aphylla (2000 ppm, 1000 ppm, and 500 ppm) against six pathogenic fungi: Fusarium oxysporum, Aspergillus niger, Aspergillus fumigatus, Aspergillus flavus, Saccharomyces cerevisiae, and Penicillium notatum. Five different solvents (methanol, ethanol, acetone, chloroform, and distilled water) were used. The percentage suppression of fungus growth was shown to be dose-dependent. Terbinafine (synthetic drug) was administered in typical dosages with distilled water to test its effect against the various fungi. Terbinafine constrained the increase in A. flavus, A. fumigatus, A. niger, F. oxysporum, P. notatum, and S. cerevisiae at concentrations of 65 ± 0.58, 72 ± 1.00, 70 ± 1.15, 59 ± 1.00, 60 ± 0.58, and 80 ± 0.58 (µg/mL of PDA medium), respectively. The most effective solvent was chloroform, which prevented 97.68% ± 0.58% growth of F. oxysporum, 9.37% ± 0.33% growth of A. niger, 92.68% ± 3.33% growth of S. cerevisiae, 91.46% ± 2.08% growth of A. fumigatus, 88.48% ± 0.88% growth of A. flavus, and 87.95% ± 1.15% growth of P. notatum. Outcomes were statistically correlated to a negative control group, and most effects were highly significant (p ≤ 0.000). The stem–bark extract of T. aphylla showed the highest percentage of suppression with chloroform, followed by ethanol, acetone, methanol, and distilled water [90]. The methanolic extract of the bark of T. aphylla was examined in a study to counter bacterial pathogens in vitro to validate as Staphylococcus aureus, Bacillus subtilis, Escherichia coli, and Salmonella typhi, and fungal strains Candida albicans and Aspergillus flavus were tested using the disc diffusion assay with 25, 50, 75, and 100 mg/mL stock solutions prepared in dimethyl sulfoxide. The extract’s inhibitory impact in millimeters was calculated by measuring the zone of growth inhibition surrounding the discs and comparing it to the reference medication. T. aphylla bark established a marked zone of inhibition at higher concentration for most fungal and bacterial strains. According to the findings, T. aphylla produces bioactive and phytochemical substances used in healthcare [81]. However, there is a scarcity of research and comprehensive reviews on T. aphylla as an alternative to antifungal medications. There is a need to study the structure–activity relationship, molecular mechanism, and potential synergistic effects of components of T. aphylla. These findings suggest the need for further research on T. aphylla to manage antifungal diseases.
5.5. Periodontal Disease
After dental caries, periodontitis is the second most prevalent dental disease worldwide [91,92]. It is caused by forming an organized biofilm of bacterial strain, so-called dental plaque, in the subgingival area, affixed to host tissues and cells. This ultimately results in loss of supporting tooth structure [93,94]. The most common cause of periodontal diseases is infection and inflammation of the alveolar bone and gingiva, which supports the tooth in the socket [95]. Gingivitis is a disease of the gums in which they become red and swollen with a high bleed tendency without loss of supporting tooth structure [96,97,98]. Adults are more likely to get periodontal disease, mainly slow and moderately progressive periodontitis. Biofilms are multispecies bacterial colonies that invade the oral cavity as plaque, causing dental cavities and periodontal disease [99]. In a study, three herbs were examined to determine the effectiveness against pinpointed dental biofilm-forming bacteria. Pathogenic strains that form dental biofilm were isolated, grown, and evaluated using PCR-based 16S ribosomal RNA (or 16S rRNA) nucleotide sequences [27].
T. aphylla, Melia azadirachta, and Acacia arabica were the three crucial medicinal plants investigated to determine their antibacterial activity against biofilm-forming strains. The findings showed that extracts of these three medicinal plants can be utilized against pathogenic bacteria that cause dental biofilms. Phylogenetic examinations explored 19 strains linked to Firmicutes, Actinobacteria, and Proteobacteria. Eleven of the 19 isolates were discovered to have a strong biofilm-forming potential, and an antibiotic activity assay revealed that the chosen herbs suppressed their development. Therefore, the findings showed that extracts of these medicinal plants can be utilized to guard against pathogenic bacteria that cause dental biofilms. Therefore, pharmaceutical companies should include them in dental care products [27]. Periodontal disease and the probable role of T. aphylla are illustrated in Figure 5.
5.6. Anticholinesterase Activity
Anticholinesterases are a class of medicines that inhibit acetylcholinesterase from destroying the neurotransmitter acetylcholine in the nervous system. Acetylcholine is a neurotransmitter that operates in the parasympathetic nervous system. It is part of the autonomic nervous system due to which smooth muscle contraction, secretion, and blood vessel dilation occur. Anticholinesterase prevents acetylcholine from being destroyed, allowing elevated levels of the neurotransmitter to accumulate at the spots of the mechanism. As a result, it provokes the parasympathetic nervous system, drops the heart rate, decreases blood pressure, stimulates secretion, and activates smooth muscle compression. The most beneficial application of anticholinesterase as a family of medications is in the treatment of Alzheimer’s disease, where decreased acetylcholine transmission contributes to the illness’s neuropathology [100].
Major constituents of T. aphylla include polyphenols, triterpenes, tamarixellagic acid, and dehydrotrigallic and dehydrodiagllic acids [12,101]; they have a potential role in preventing chronic and degenerative diseases. Traditional medicine uses Tamarix species as a stimulant of perspiration, an astringent, and a diuretic. The biological activities of several T. aphylla extracts were investigated in comparative research. At the measured concentration of 1110.00 g/mL and under the assay conditions, inhibitory percentages of 21.00%, 11.20%, and 9.16% were established for AcOEt, EtOH, and MeOH leaf extracts, respectively, with modest activity against AChE. Stem extracts were prepared using the same solvents and revealed inhibitory percentages of 16.19% (AcOEt), 17.45% (EtOH), and 10.20% (MeOH). In the case of butyrylcholinesterase (BuChE), T. aphylla extracts were ineffective in terms of inhibition. When it came to inhibiting AChE and BuChE, the examined extracts were less effective than the positive control galantamine, which was evaluated under identical circumstances (IC50 = 1.95 and 4.71 μg/mL, respectively). The absence of action against BuChE and the modest activity of the studied extracts against AChE can be explained by the potential antagonism of physiologically active p-coumaric acid (only detected in the AcOEt extract), with high anti-ChE activity against both BuChE and AChE [102]. There are many other unidentified compounds, but polar MeOH and EtOH extracts are rich in ellagic and gallic acids, which have been proclaimed as effective blockers of AChE [46]. Mahfoudhi et al. exhibited that activity toward superoxide anion radicals (O2−), DPPH radicals, and nitric oxide radicals (•NO) was accomplished in a concentration-dependent mode. T. aphylla also had modest anti-acetylcholinesterase activity but no anti-butyrylcholinesterase effects. MeOH extracts had IC50 values ranging from 8.41 to 24.81 g/mL against α-glucosidase [54].
5.7. Analgesic Activity
Pain is an unpleasant sensation because of actual or prospective tissue injury. The experience of pain is produced in the early stages via direct activation of sensory nerve fibers. Contrastingly, inflammatory mediators are the main cause of trouble in the later stages. Contemporary anti-inflammatory and antipain medications are helpful, but they have serious side-effects including anemia, ulcers, endocrine disruption, and osteoporosis. On the other hand, numerous prospective phytoconstituents from herbs have shown analgesic activities; therefore, people are more interested in medicinal plants than synthetic medicines. In addition, these plants generally have adequate biological activity with fewer adverse effects [103].
In this section, we review the analgesis activity of T. aphylla. The findings of this section allow identifying T. aphylla and its secondary metabolites, which can be helpful in clinically advanced herbal drugs as analgesics with fewer adverse effects and improved bioavailability. One study examined the analgesic effect of an aqueous ethanol (70:30) extract of T. aphylla aerial parts prepared using cold maceration. The study investigated analgesic efficacy in mice using eddy’s hot plate method, formalin-induced paw licking, and the acetic acid-induced writhing. When compared to the normal control, the aqueous ethanol extract of T. aphylla inhibited 42% (p < 0.005) of acetic acid-induced writhing, 63% (p < 0.005) of formalin-induced paw licking, and 42% (p < 0.005) of response time. Outcomes of the examination showed that the aqueous ethanolic extract of T. aphylla has promising analgesic properties [21]. The results of this study encourage the application of T. aphylla to alleviate fever and pain. Moreover, more examinations are required to establish the cellular mechanisms and classify the constituents of structurally effective substances for standardization. Another study was conducted in Khartoum, Sudan, for 6 months. The Phyto-342 components of T. aphylla were detected using standard techniques from the laboratory sheet. Animal models specified in conventional methods evaluated the percentage of granuloma tissue, inhibition percentage of edema, stabilizing ability of membrane, and analgesic effectiveness. In addition, 100 mg/kg and 200 mg/kg dose regimens of T. aphylla considerably enhanced the reaction time and lowered the body temperature (p < 0.05) of rats compared to acetylsalicylic acid. Furthermore, the ethanolic extract of T. aphylla has shown membrane-stabilizing and analgesic properties [104].
5.8. Antidiabetic Activity
According to the WHO, 220 million humans are affected by diabetes; this number is anticipated to be double by 2030 [105]. However, glucose is an important energy source for the cells that make up tissues and muscles, and it fuels the brain [106,107,108]. How the body uses glucose (blood sugar) is the cause of various diseases. The state of hyperglycemia is called diabetes mellitus [109]. This ailment hits the cardiovascular system, nervous system, kidneys, and eyes [110]. Inflammation is due to the triggering of various immune cells leading to the death of pancreatic beta cells death via several inflammatory cytokines, thus resulting in insulin resistance [111]. Reactive oxygen species and oxidative stress are major causes of diabetes [112]. Diabetes is a severe metabolic condition that is treated using a variety of medicinal herbs in traditional medicine [113]. The main objective of all diabetes care is to keep blood glucose levels stable. Traditional medicine and natural products have the potential for developing therapeutics against chronic inflammatory diseases. Many drugs are obtained from these herbs with limited adverse effects or no side-effects [64]. They are efficient herbal medications and natural antioxidants because they include antidiabetic chemicals, including alkaloids, phenolics, tannins, and flavonoids, reducing glucose absorption in the intestine or improving pancreatic tissue performance by boosting its performance in terms of insulin production [113]. This portion of the review aims to gather existing knowledge on T. aphylla regarding its antidiabetic potential with future research directions.
T. aphylla is used as a carminative, diuretic, and anti-inflammatory herbal remedy. A study was carried out to investigate the antihyperglycemic activity of T. aphylla leaves in STZ-NIC-stimulated diabetes in Wistar Albino rats. T. aphylla’s methanol extract was examined to determine its acute toxicity. Different doses (100 mg, 250 mg, and 400 mg/kg body weight per day) of T. aphylla leaves extract were administered for 21 days to diabetic Wistar rats. Multiple parameters were examined, such as hemoglobin, glycosylated hemoglobin, and fasting blood glucose levels. A total of 50 male Wistar rats, aged 8–10 weeks and weighing 220–320 g, participated in this examination. All rats stayed in an airy room with a humidity of 40–50% and a temperature of 25 ± 2 °C in a 12 h light/dark cycle. For 2 weeks before the experiment and throughout the experiment, rats were fed regular laboratory food and had an available water supply. Rats were fasted for 12 h before receiving a diabetic injection. A single intraperitoneal (i.p.) injection of STZ (65 mg/kg body weight (b.w.)) freshly dissolved in ice-cold saline was used to induce diabetes [114]. An equal volume of normal saline was injected into control animals. Nicotinamide (180 mg/kg, i.p.) was dissolved in normal saline and given 15 min before STZ administration [115]. High pancreatic insulin release could be the cause of deadly hypoglycemia. At the end of STZ treatment over the next 24 h, a 10% glucose solution was fed to rats to subdue drug stimulated hypoglycemia [7]. In an acute toxicity investigation, animals given a methanol extract of T. aphylla showed no change in their behavior pattern [8]. Male Wistar mice were used in the experiment [116]. There was no evidence of death in the extract-treated mice, and their performance looked to be normal. Up to the 1500 mg/kg dosage, no mortality or toxic response was observed until the end of the day. Blood glucose levels were assessed in normal control and experimental animals on days 1, 3, 7, 14, and 21 of the therapy. Compared to normal rats, STZ-NIC-stimulated diabetic rats exhibited a considerable rise in blood glucose levels. In the analysis of diabetic control, i.p. management of T. aphylla (400 mg/kg body weight) substantially reduced FBS (fasting blood sugar). The 21 days of therapy using T. aphylla were examined in terms of glycosylated hemoglobin and hemoglobin levels in usual and STZ-stimulated diabetic rats. Analysis of normal control and diabetic rats showed a substantial drop in hemoglobin and a rise in HbA1c. In contrast to diabetic control rats, i.p. T. aphylla improved hemoglobin and lowered HbA1c. Compared to the normal control rats, STZ treatment led to changes in HbA1c, hemoglobin, and blood glucose. The results showed that T. aphylla leaf extract lowers blood glucose levels in people with diabetes. Furthermore, it can avoid diabetes complications caused by high blood glucose levels [8].
Antidiabetic properties are linked to the presence of terpenoids, flavonoids, coumarins, and a host of different secondary plant metabolites of T. aphylla [117]. Galls of T. aphylla comprise polyphenols, such as gallic acid, ellagic acid, isoferulic acid, dehydrodigallic acid, and juglanin, as well as flavonoids such as isoquercitrin, quercetin glucoside, and its methyl derivatives tamarixetin and tamarixin [4]. Gallic acid (GA) is a phytochemical with several biological functions, and it offers antioxidant and anti-advanced glycation properties. It also inhibits angiotensin-converting enzyme [118]. Another study examined the combined effect of metformin with secondary metabolites such as gallic acid in improving antioxidant activity and glucose metabolism in diabetic rats. The pancreas and liver of diabetic rats were examined after administering metformin and GA. Outcomes showed that metformin and GA decreased the levels of IL-6 and TNF-α, and the expression of ATF4. Results of the study validated that the combination of GA and metformin is more effective than metformin alone [119]. Furthermore, another study validated that andrographolide and gallic acid synergistically reduce the level of blood glucose [120]. Therefore, GA meets the criteria for being investigated as a therapeutic candidate in diabetic nephropathy, one of the most severe complications of diabetes. GA therapy significantly increased albumin and protein levels while reducing plasma creatinine and blood urea nitrogen levels. GA also enhanced creatinine clearance. According to oxidative stress markers, GA treatment in mice exhibited significantly lessened oxidative stress in the kidney. In diabetic nephropathy, it also lowered TGF-β1 levels in the blood and renal tissue. According to the findings, T. aphylla is a good source of GA, which can be utilized successfully in treating diabetic nephropathy [118].
A flower extract of T. aphylla yielded tamarixetin 3,3′-disodium sulfate and glycosylated isoferulic acid [18]. An examination was carried out to determine the free-radical scavenging and antiglycation properties of isoferulic acid (IFA). IFA’s free-radical scavenging activity was calculated employing DPPH, FRAP, and metal adsorption assays. Various spectroscopic techniques were used to measure the antiglycation activity of IFA. The research outcomes displayed the effect of IFA on ROS and glycation via a structural transformation of HAS (human serum albumin). A comparison of the antioxidant properties of IFA with GA, employing many biochemical and biophysical methods, showed that IFA has ideal properties [121].
There is a constant rise in blood glucose in type 2 DM due to the breakdown of starchy foods by glucose absorption and α-amylase in the small intestine by α-glucosidase [122]. Suppression of α-glucosidase activity has been linked to a reduction in plasma glucose levels and suppression of postprandial hyperglycemia. Consequently, it represents a successful remedial approach to treat type 2 DM by lowering glucose levels in the blood [123]. In contrast, α-glucosidase blockers, such as voglibose, acarbose, and miglitol, lead to gastrointestinal adverse effects such as diarrhea and flatulence. As a result, it is critical to discover indigenous natural resources free of or with fewer adverse effects [124]. A study was carried out by Mahfoudhi et al. in which MeOH extracts from the leaves and stems of T. aphylla were examined to inhibit α-glucosidase actions. T. aphylla inhibited α-glucosidase in a concentration-dependent manner, with 91.98% and 88.73% inhibition at concentrations of 113.64 and 28.41 g/mL, respectively. In this study, IC50 values were found for leaves (24.81 μg/mL) and stem (8.41 μg/mL). These results were lower than those reported for acarbose (IC50 = 300 g/mL), the positive control. The inhibition by T. aphylla extracts was significantly higher compared to other botanicals employed in diabetic medication, such as Glycyrrhiza uralensis (IC50 = 20.1 mg/mL) [125] and Viscum album (IC50 = 11.7 mg/mL) [54,126]. It has been reported in previous studies that quercetin, ellagic acid, and kaempferol inhibited α-glucosidase [127,128]. Therefore, it can be concluded that T. aphylla’s MeOH extracts exhibited higher antidiabetic properties due to the presence of quercetin, ellagic acid, and kaempferol. It can also be concluded that α-glucosidase displays suppressive properties, whereas T. aphylla exhibits antioxidant properties. As a result, T. aphylla might be beneficial in the therapy of DM. Furthermore, T. aphylla works by blocking a pathology-related enzyme and strengthening the patients’ antiradical defenses [54]. The proposed mechanism underlying the glucosidase-inhibitory properties of T. aphylla is shown in Figure 6.
Separating the active components of T. aphylla and the molecular interactions of its constituents for investigation of their therapeutic effects requires more research. As a result, we must keep looking for new and, if possible, more effective antidiabetic properties of T. aphylla, and its vast reservoirs of phytoconstituents might represent an excellent alternative. Despite this, there is little research on the plant’s antidiabetic properties.
5.9. Cytotoxic Activity
Natural materials have been recognized as possible sources of human medicines since ancient times. Over 50% of all pharmaceutical drugs are still natural ingredients [129,130]. Currently, natural sources such as plants, microorganisms, and sea creatures account for more than 60% of commercially accessible anticancer medicines [131,132,133,134]. A total of 3000 plant species have been utilized to treat various kinds of cancer [132,135]. Every year, many chemical entities are introduced to the market or undergo clinical studies [129]. Plant bioactive compounds and phytochemicals can prevent more than 20% of cancer diagnoses and 200,000 cancer-related deaths per year. Several plants are being studied for cancer prevention due to their lesser toxicity, safety, and antioxidant qualities [80,132,136]. Since the 1940s, natural products or derivatives of natural products have accounted for 48.6% of the 175 small compounds authorized for cancer treatment [137]. Therefore, it is essential to obtain valuable and harmless unique agents with cytotoxic properties with minimal or no adverse effects on normal cells, along with extraordinary potency at various sites, as well as low cost and acceptance in the community. Consequently, conducting various in vitro, in vivo, and clinical examinations is also necessary [138].
It is essential to test cytotoxicity to establish the safety profile of T. aphylla and obtain active constituents [139]. To investigate the cytotoxic impact, fresh and disease-free leaves of T. aphylla were collected from several geographical sites in Saudi Arabia. In vitro, the anticancer and cytotoxic effects of T. aphylla leaves were examined, employing MCF (breast adenocarcinoma cells) as carcinoma cells and Vero cells as normal cells. The 50% cytotoxicity concentration denoting the concentration leading to a 50% reduction in cell viability was investigated. The result of the MTC colorimetric test was determined to be 2000 g/mL. A mild cytotoxic effect was observed at high concentrations of leaf extract of T. aphylla on the Vero cell line with a 50% cytotoxicity concentration >100 g/mL. In a concentration-dependent manner, the methanolic extract inhibited MCF cancer cells. The findings of the cytotoxicity test of T. aphylla leaf methanolic extracts on Vero cells indicated that this plant is potentially nontoxic. As a result, the findings of this investigation suggested that T. aphylla’s cytotoxic strength should be considered a potential applicant for future testing in vivo and in vitro against various additional cell types. This is in line with earlier research on the intriguing anticancer properties of Tamarix species [80]. Antiproliferative effectiveness was found against MCF-7 cells using the leaf extract of T. aphylla; thus, it should be employed in future antiproliferative studies. GC–MS and GC methods were used to examine the antiproliferative activity of the essential oil composition of aerial parts of T. aphylla aqueous extract (AE) and ethanol extract (EE), as well as to investigate potential cytotoxicity against pancreatic carcinoma, colorectal adenocarcinoma, human breast adenocarcinoma (MCF-7), and normal human fibroblasts. It was found in the GC–MS analysis of T. aphylla EO that the principal component was 6,10,14-trimethyl-2-pentadecanone in terms of predominance and richness among non-terpenoid nonaromatic hydrocarbons (52.39%). Biological results showed that T. aphylla extracts exhibit cytotoxicity in a dose-dependent manner against most tested cell lines. Nevertheless, potent effects were recorded against MCF-7 cells with IC50 values of 2.17 ± 0.10 and 26.65 ± 3.09 μg/mL for T. aphylla EE and AE, respectively. T. aphylla AE has exhibited a comparable cytotoxic profile to control drug cisplatin (IC50 value of 1.17 ± 0.13 μg/mL), along with a complete safety profile against normal fibroblast cells (IC50 of T. aphylla AE versus cisplatin: 79.99 ± 4.90 versus 9.08 ± 0.29 μg/mL). In addition, at concentrations less than 30 g/mL, the AE showed no antiproliferative potential against Panc-1 or Caco-2 cancer cell lines. This study concluded that T. aphylla extracts might be cytotoxic agents with selective cytotoxicity profiles and high safety [140]. Another study used the brine shrimp method to examine the cytotoxic property of methanol extracts of T. aphylla leaves. This method showed a 70% mortality rate to T. aphylla extract at a 500 μg/mL concentration [141]. The cytotoxic potential of T. aphylla bark extract against human erythrocytes was assessed. T. aphylla bark extract exhibited 3.48 ± 1.08 hemolytic activity compared to the positive control. The studied T. aphylla extracts had a lower hemolytic potential, making them safe in pharmaceutical applications [142]. Many studies reported a high content of polyphenols, tannins, and flavonoids [143,144,145]. Various phenolic compounds isolated from Tamaricaceae were tested against different cancer cell lines for their cytotoxic effects [146]. Tamarixetin was discovered to be cytotoxic to leukemia cells [147]. In a time- and dose-dependent manner, this compound suppressed proliferation, caused apoptosis, and stopped cell-cycle progression [148]. Ellagitannins have also exhibited anticancer and antiangiogenic properties mediated by the host [149]. As shown by TLC tests, secondary metabolites and phenolic fractions may account for the higher cytotoxic property found in various studies of the extracts of T. aphylla [140]. T. aphylla extracts have shown antiproliferative activities against MCF-7 cancer cell lines, which could be the basis to attract future research to develop novel cancer therapies. The reported analgesic activity mechanism, anticholinesterase action, cytotoxicity against different cell lines, and antifungal activity against different fungal strains of T. aphylla are shown in Figure 7.
6. Toxicity
Natural medicinal plants are important because they are rich in diverse phytochemical components. In addition to being extensively accessible and commercially useful, these phytochemical substances have pharmacological effects in treating various medical situations. Plant phytochemical substances have been investigated in numerous experiments to discover the molecular basis of their interaction with medicines and illnesses [150]. However, plants are potentially toxic due to their chemical components; as a result, certain plants employed in traditional medicine are intrinsically harmful [151,152,153]. T. aphylla (L. Karst) methanol extract was examined for acute toxicity. In the three test groups, a leaf extract of T. aphylla was administered intraperitoneally with doses of 100 mg, 250 mg, and 400 mg/kg body weight to the mice of every group per day. The control group was administered saline; mice were examined in terms of the following factors for 2 h: (a) behavioral determinants: agitation, alertness, dread, and irritability; (b) neurological determinants: reaction, impulsive action, touch reaction, gait, and pain response; (c) autonomic determinants: urination and excretion. They were monitored for mortality or lethality after 24 h. In an acute toxicity investigation, the methanol extract of T. aphylla-treated mice did not lead to changes in behavioral pattern. Male Wistar mice were used in the experiment. There was no evidence of death in the extract-treated mice, and their performance looked to be normal. No toxicity or mortality was observed at the end of the day after administering 1500 mg/kg; therefore, T. aphylla’s extracts are nontoxic [8]. The results of another toxicological study on T. phylla extract at various doses up to 2000 mg/kg did not show any adverse effect [70]. Another study of T. aphylla extract showed a protective effect against DOX cardiotoxicity [154]. Toxicity was negligible in T. aphylla from Saudi Arabia and Pakistan [144]. Table 3 presents the results of various preclinical studies.
7. Concluding Remarks
This review covered the recent literature related to the ethnobotanical uses, phytochemical compounds, pharmacological effects, and toxicology of T. aphylla. The findings of this work establish the connection between T. aphylla in the traditional medication system and its impact on other biological properties such as antibacterial, anti-inflammatory, antidiabetic, analgesic, wound healing, antifungal, and anticholinesterase activities. The leaves and stem/bark seem to be the most effective plant parts of T. aphylla as these parts showed several therapeutic activities. However, there is a need to study the isolation and characterization of phytoconstituents, as well as the molecular mechanism of components from these plant parts of T. aphylla. Different chemical compounds such as polyphenols, flavonoids, and tannins account for the various biological activities of T. aphylla. Isolation of secondary metabolites and their examinations in vitro and in vivo to test various pharmacological activities could attract future research and drug discovery.
However, nonclinical studies have shown that the T. aphylla has significant antimicrobial, antioxidant, and cytotoxic activities. Thus, more extraction, isolation, and purification studies are needed to develop potential drugs to treat various ailments. The findings of many studies exhibited that the leaf extract of T. aphylla is nontoxic with no reported mortality, while toxicity of T. aphylla was found to be negligible in studies from Saudi Arabia and Pakistan. The pharmacological properties of T. aphylla, according to study findings, support its traditional applications. Clinical trials establishing the health benefits were not found; therefore, high-quality preclinical studies and well-designed clinical studies are needed to confirm the efficacy and safety of T. aphylla in people.
Moreover, herbal supplements have not received the same scientific scrutiny and are not as strictly regulated as medications. Natural products are regulated by the US Food and Drug Administration (FDA), but not as strictly as prescription or over-the-counter (OTC) drugs. Natural products should be free of contaminants and must meet specific quality standards. Some herbs can cause serious side-effects when mixed with aspirin, blood thinners, and blood pressure medications. Many herbal supplements can affect the success of surgery. Some may decrease the effectiveness of anesthesia or cause dangerous complications, such as bleeding. Few natural products have been tested in children or have established safe doses. Moreover, older adults may metabolize medications differently. Therefore, it is essential to learn about the potential benefits and side-effects of herbal supplements before they are prescribed in the clinic.
Conceptualization and methodology, S.W., S.A.A. and S.S.A.; writing—original draft preparation, S.W., S.S.A., G.D., U.H., W.A. and M.A.; writing—review and editing, S.W., S.A.A., A.A., G.K. and R.V. All authors have read and agreed to the published version of the manuscript.
Please add: This research was funded by Deanship of Scientific Research, King Khalid University, Abha, Saudi Arabia, through the small Research Group Program grant number RGP.1/336/42.
The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University, Abha, Saudi Arabia for funding this work through the Small Research Group Project under grant number RGP.1/336/42.
The authors declare no conflict of interest.
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Enlarge this image.Figure 1. Overview of the T. aphylla ethnobotanical, phytochemical, and pharmacological potential.
Enlarge this image.Figure 2. Inflammatory pathway and the probable role of T. aphylla as an anti-inflammatory agent. ROS: Reactive oxygen species, TNF-α: Tumor necrosis factor alpha, NO: Nitric oxide, IL-1: Interleukin-1, IL-6: Interleukin-6.
Enlarge this image.Figure 4. Possible antibacterial mechanism of T. aphylla against clinically important pathogens.
Enlarge this image.Figure 6. The proposed mechanism underlying the glucosidase-inhibitory properties of T. aphylla.
Enlarge this image.Figure 7. Analgesic, anticholinesterase, cytotoxicity, and antifungal activity of T. aphylla.
T. aphylla’s ethnomedicinal usage in many places around the world.
| Geographical Location | Parts of the Plant Used | Indication | Route of Administration | Results | References |
|---|---|---|---|---|---|
| Southeastern Morocco | Leaf | Hypertension | S/Decoction | Information was collected from the respondents of Errachidia province regarding the plants used for hypertension, one of which was T. aphylla. | [ |
| The central region of Abyan governorate, Yemen | Bark and leaf | Abdominal pain, hair loss, cough, and asthma | S, Lo/Infusion, decoction | Ethnobotanical survey of medicinal plants showed that residents of Yemen use T. aphylla for abdominal pain, hair loss, cough, and asthma. | [ |
| Northwestern part of Pakistan | Whole plant | Abscesses and wounds, rheumatism, jaundice, bad evils | S, Lo/Decoction of ash, ash, boiled leaves | T. aphylla is one of the plants enlisted in the Holy Quran, Islamic literature, and Ahadith with ethnobotanical relevance. | [ |
| District Sargodha, Punjab, Pakistan | Bark | Measles, aphrodisiac | S/Powdered with oil, smoke | T. aphylla is one of the most used timber species in district Sargodha. | [ |
| Peshawar Valley of Pakistan | Bark and leaf | Paralysis, abdominal pain, tetanus, rheumatism, and wound healing | S, Lo/Powder extract | Ethnobotanical study on medicinal plants exhibited that residents of Peshawar use T. aphylla in various diseases. | [ |
| District Karak, Pakistan | Leaf | Animal pain killer for wounds, in bird flu | S/Smoke | This study showed the ethnoveterinary use of T. aphylla. | [ |
| Pakistan | Fruit | Diabetes | S/Decoction | T. aphylla can be used as antidiabetic medication. | [ |
| Karamar Valley, Swabi, Pakistan | Bark | Jaundice, rheumatism, infection of gums and teeth | ND | T. aphylla’s extract showed activity against the biofilm-causing bacteria in periodontal diseases. | [ |
| Chenab riverine area, Punjab province, Pakistan | Leaf and bark | Cough and cold, eye infection, |
S, Lo/ |
Local people employ T. aphylla to cure various ailments in numerous regions of Pakistan. | [ |
| Rajhan Pur, Punjab, |
Root, leaf | All contagious diseases, jaundice, smallpox, leprosy, tuberculosis | ND | A field survey showed various uses of T. aphylla in multiple diseases. | [ |
| Central Sahara | Shoots | Aid to menstruation, |
S/Decoction | Results showed that people traditionally use T. aphylla as a potential traditional healer. | [ |
| Jordan, North Badia | Leaf | Fever | S/Decoction | T. aphylla is an effective medication in pain and inflammations. | [ |
Abbreviations: T: Tamarix, L: leaf, B: bark, F: fruit, G: gall, R: root, SH: shoots, WP: whole plant, S: systemic, Lo: local, ND: not defined.
Some of the primary and secondary metabolites of T. aphylla.
| Phytochemical Category | Phytochemical Name | Structure | Part/Extract | References |
|---|---|---|---|---|
| Aromatic hydrocarbon |
Fructose | [Image omitted. Please see PDF.] | G, Gu/EtAc | [ |
| Glucose | [Image omitted. Please see PDF.] | G, Gu/EtAc | [ |
|
| Raffinose | [Image omitted. Please see PDF.] | G/EtAc | [ |
|
| Ribose | [Image omitted. Please see PDF.] | G/EtAc | [ |
|
| Sucrose | [Image omitted. Please see PDF.] | G/EtAc | [ |
|
| Xylose | [Image omitted. Please see PDF.] | G, Gu/EtAc | [ |
|
| Flavonoids | Apigenin | [Image omitted. Please see PDF.] | SS, L, B, EtOH | [ |
| Isoquercetin | [Image omitted. Please see PDF.] | G/EtAc | [ |
|
| Isorhamnetin | [Image omitted. Please see PDF.] | L, S, B/EtOH, aqueous | [ |
|
| Juglanin | [Image omitted. Please see PDF.] | G/EtAc | [ |
|
| Kaempferide | [Image omitted. Please see PDF.] | Ap/EtOH | [ |
|
| Kaempferol | [Image omitted. Please see PDF.] | L and S/MeOH, EtOH | [ |
|
| Luteolin | [Image omitted. Please see PDF.] | L and S, EtOH | [ |
|
| Quercetin | [Image omitted. Please see PDF.] | SS, L/EtOH | [ |
|
| Quercetin dimethyl ether | [Image omitted. Please see PDF.] | L/Aqueous | [ |
|
| Quercetin-3-rhamnoside | [Image omitted. Please see PDF.] | F/EtOH | [ |
|
| Quercetin 3-O-galactoside | [Image omitted. Please see PDF.] | L and S/MeOH, EtOH | [ |
|
| Phenolic acid | Caffeic acid | [Image omitted. Please see PDF.] | L and S, EtOH | [ |
| Dehydrodigallic acid | [Image omitted. Please see PDF.] | G, EtAc | [ |
|
| Dehydrotrigallic acid | [Image omitted. Please see PDF.] | G/aqueous ethanolic acid | [ |
|
| Ellagic acid | [Image omitted. Please see PDF.] | G, debarked heartwood | [ |
|
| Gallic acid | [Image omitted. Please see PDF.] | L, debarked heartwood | [ |
|
| Isoferulic acid | [Image omitted. Please see PDF.] | Debarked heartwood, G, EtAc | [ |
|
| p-Coumaric acid | [Image omitted. Please see PDF.] | L and S/EtOH, |
[ |
|
| Syringic acid | [Image omitted. Please see PDF.] | L, debarked heartwood/aqueous | [ |
|
| Phenolic glycoside | Dehydrodigallic-xanthone | [Image omitted. Please see PDF.] | G/Aq-EtOH | [ |
| Dehydrotrigallic-xanthone | [Image omitted. Please see PDF.] | G/Aq-EtOH | [ |
Abbreviations: G: gall, L: leaf, S: stem, F: flower, B: bark, Sh: shoot, Ap: aerial parts, Pet: petroleum, EO: essential oil, Gu: gum, R: root, Aq: aqueous, EtOH: ethanol, MeOH: methanol, EtAc: ethyl acetate.
Characteristics of included preclinical studies.
| Pharmacological Activity | Plant Part | Solvent for Extraction | Model/Induction/Agent/ |
Dosage or Concentration | Sample Size/Pathogens | Results | References |
|---|---|---|---|---|---|---|---|
| Antidiabetic | Leaf | MeOH | In vivo study, diabetic Wistar rats (induced by nicotinamide + STZ) | 100, 250, 400 mg/kg/ |
50 male Wistar rats | Outcomes showed nontoxic and antidiabetic properties | [ |
| Antidiabetic | Leaf, stem | MeOH | In vitro study, |
1–1000 μg/mL | - | Antidiabetic properties were shown | [ |
| Antipyretic, analgesic, and anti-inflammatory properties | Aerial parts | Aqueous ethanolic extract | In vivo, |
100 mg/kg/day | Swiss albino male mice (20–30 g), three groups of six mice | Outcomes revealed antipyretic and analgesic activities with lessened anti-inflammatory action | [ |
| Anti-inflammatory and wound healing | Leaf | EtOH | In vivo, |
15%, 25% in gel base | Wistar rats (180–200 g) | Outcomes showed gel usefulness | [ |
| Antimicrobial | Leaf, stem, |
Diverse extracts | In vitro study, micro-titer assay, agar well diffusion method | 1 mg/mL | - | Helpful against 11 biofilm-forming strains | [ |
| Leaf | MeOH extract | In vitro: |
0.86–30 mg/ mL | - | No considerable antibacterial effect | [ |
|
| Antifungal | Leaf | MeOH extract | In vitro: dilution of agar tubes | 67 μL (200 μg/mL) | - | T. aphylla |
[ |
| Stem, |
Crude ethanolic extracts | In vitro | Concentrations 500 ppm, 1000 ppm, and 2000 ppm | Six pathogenic fungi | Maximum inhibition has been shown by T. aphylla | [ |
|
| Bark | MeOH | In vitro: disc diffusion assay | 25, 50, 75, and 100 mg/mL | Aspergillus flavus and Candida albicans | T. aphylla inhibited most fungal strains at higher concentrations | [ |
|
| Toxicity | Leaf | MeOH | In vivo, |
500–2100 mg/kg/day | 50 male, Wistar rats (220–320) g | Nontoxic | [ |
| Toxicity | Leaf | EtOH | In vivo, |
Doses administered: 50, 100, 300, 1000, and 2000 mg/kg body weight | Wistar rats | No toxicity was reported up to 2000 mg/kg body weight | [ |
| Toxicity | Leaf | MeOH | In vivo | 50–500 mg/ mL | Brine shrimp | Brine shrimp showed a 70% mortality rate | [ |
| Wound healing | Leaf | EtOH | In vivo, |
15%, 25% in gel base | Wistar rats | T. aphylla leaf extract possesses wound-healing properties | [ |
| Periodontal disease | Bark, stem, leaves | Methanol, ethanol, acetone, and water extracts | In vitro, phylogenetic analysis | - | Pathogenic bacteria from dental biofilms. | T. aphylla showed potent antibiofilm activity | [ |
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; Shahabe Saquib Abullais 2 ; Das, Gotam 3
; Umme Hani 4 ; Ahmad, Wasim 5
; Amir, Mohd 6
; Ayaz, Ahmad 5 ; Kandasamy, Geetha 7 ; Vasudevan, Rajalakshimi 8 1 Department of Pharmacognosy, College of Pharmacy, King Khalid University, Abha 61421, Saudi Arabia;
2 Department of Periodontics and Community Dental Sciences, College of Dentistry, King Khalid University, Abha 61421, Saudi Arabia;
3 Department of Prosthodontics, College of Dentistry, King Khalid University, Abha 61421, Saudi Arabia;
4 Department of Pharmaceutics, College of Pharmacy, King Khalid University, Abha 62529, Saudi Arabia;
5 Department of Pharmacy, Mohammed Al-Mana College for Medical Sciences, Safaa, Dammam 34222, Saudi Arabia;
6 Department of Natural Products and Alternative Medicines, College of Clinical Pharmacy, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia;
7 Department of Clinical Pharmacy, College of Pharmacy, King Khalid University, Abha 61421, Saudi Arabia;
8 Department of Pharmacology, College of Pharmacy, King Khalid University, Abha 61421, Saudi Arabia;