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© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

The Greater Mekong Subregion (GMS) is the epicenter of antimalarial drug resistance. We determined in vitro susceptibilities to 11 drugs of culture-adapted Plasmodium falciparum isolates from adjacent areas (Laiza and Muse) along the China–Myanmar border. Parasites from this region were highly resistant to chloroquine and pyrimethamine but relatively sensitive to other antimalarial drugs. Consistently, the Dd2-like pfcrt mutations were fixed or almost fixed in both parasite populations, and new mutations mediating piperaquine resistance were not identified. Similarly, several mutations related to pfdhfr and pfdhps were also highly prevalent. Despite their geographical proximity, malaria parasites from Laiza showed significantly higher in vitro resistance to artemisinin derivatives, naphthoquine, pyronaridine, lumefantrine, and pyrimethamine than parasites from Muse. Likewise, the pfdhfr N51I, pfdhps A581G, pfmrp1 H785N, and pfk13 F446I mutations were significantly more frequent in Laiza than in Muse (p < 0.05). For the pfmdr1 mutations, Y184F was found only in Laiza (70%), whereas F1226Y was identified only in Muse (31.8%). Parasite isolates from Laiza showed a median RSA value of 5.0%, significantly higher than the 2.4% in Muse. Altogether, P. falciparum parasite populations from neighboring regions in the GMS may diverge substantially in their resistance to several antimalarial drugs. This information about different parasite populations will guide antimalarial treatment policies to effectively manage drug resistance during malaria elimination.

Details

Title
Different In Vitro Drug Susceptibility Profile of Plasmodium falciparum Isolates from Two Adjacent Areas of Northeast Myanmar and Molecular Markers for Drug Resistance
Author
Duan, Mengxi 1 ; Bai, Yao 1 ; Deng, Shuang 2 ; Ruan, Yonghua 2 ; Zeng, Weilin 1 ; Li, Xiaosong 1 ; Wang, Xun 1 ; Zhao, Wei 1 ; Zhao, Hui 1 ; Sun, Kemin 1 ; Zhu, Wenya 1 ; Wu, Yiman 1 ; Miao, Jun 3   VIAFID ORCID Logo  ; Myat Phone Kyaw 4 ; Yang, Zhaoqing 1 ; Cui, Liwang 3   VIAFID ORCID Logo 

 Department of Pathogen Biology and Immunology, Kunming Medical University, Kunming 650500, China 
 Department of Pathology, Kunming Medical University, Kunming 650500, China 
 Department of Internal Medicine, Morsani College of Medicine, University of South Florida, 3720 Spectrum Boulevard, Suite 304, Tampa, FL 33612, USA 
 Myanmar Health Network Organization, Yangon 11181, Myanmar 
First page
442
Publication year
2022
Publication date
2022
Publisher
MDPI AG
e-ISSN
24146366
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2756818321
Copyright
© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.