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© 2018. This work is published under http://creativecommons.org/licenses/by-nc/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Background

24‐dehydrocholesterol reductase (Dhcr24) catalyzes the last step of cholesterol biosynthesis, which is required for normal development and anti‐apoptotic activities of tissues. We found that Dhcr24 expression decreased in the cTnTR141W dilated cardiomyopathy (DCM) transgenic mice. Therefore, we tested whether rescued expression of Dhcr24 could prevent the development of DCM and its possible mechanism.

Methods

Heart tissue specific transgenic overexpression mice of Dhcr24 was generated, then was crossed to cTnTR141W mouse to obtain the double transgenic mouse (DTG). The phenotypes were demonstrated by the survival, cardiac geometry and function analysis, as well as microstructural and ultrastructural observations based on echocardiography and histology examination. The pathway and apoptosis were analysed by western blotting and TUNEL assay in vivo and in vitro.

Results

We find that Dhcr24 decreased in hearts tissues of cTnTR141W and LMNAE82K DCM mice. The transgenic overexpression of Dhcr24 significantly improves DCM phenotypes in cTnTR141W mice, and activates PI3K/Akt/HKII pathway, followed by a reduction of the translocation of Bax and release of cytochrome c, caspase‐9 and caspase‐3 activation and myocyte apoptosis. Knockdown the expression of Dhcr24 reduces the activation of PI3K/Akt/HKII pathway and inhibition of the mitochondrial‐dependent apoptosis. The anti‐apoptotic effect of Dhcr24 could be completely removed by the inhibition of PI3K pathway and partly removed by the HKII inhibitor in H9c2 cell line.

Conclusion

Compensatory expression of Dhcr24 protect against DCM through activated PI3K/Akt/HKII pathway and reduce Bax translocation. This is the first investigation for the molecular mechanism of Dhcr24 participate in development of DCM.

Details

Title
Dhcr24 activates the PI 3K/Akt/ HKII pathway and protects against dilated cardiomyopathy in mice
Author
Dong, Wei 1 ; Fei‐fei Guan 1 ; Zhang, Xu 1 ; Gao, Shan 1 ; Liu, Ning 1 ; Chen, Wei 1 ; Lian‐feng Zhang 1 ; Lu, Dan 1 

 Key Laboratory of Human Disease Comparative Medicine, NHFPC, Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences & Comparative Medical Center, Peking Union Medical College, Beijing, China 
Pages
40-52
Section
ORIGINAL ARTICLES
Publication year
2018
Publication date
Mar 2018
Publisher
John Wiley & Sons, Inc.
e-ISSN
25762095
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2262103390
Copyright
© 2018. This work is published under http://creativecommons.org/licenses/by-nc/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.