Xiuya Li
Jie Huang
Chen Xu
Qianqian Liang
Kehan Ren
Aobing Bai
Chao Lu
Ruizhe Qian
Ning Sun
1 Department of Physiology and Pathophysiology, State Key Laboratory of Medical Neurobiology, School of Basic Medical Sciences, Fudan University, Shanghai 200032, China;
2 Department of Pathology, School of Basic Medical Sciences, Fudan University, Shanghai 200032, China;
3 Shanghai Key Lab of Birth Defect, Children's Hospital of Fudan University, Shanghai 201102, China;
4 Shanghai Key Laboratory of Clinical Geriatric Medicine, Fudan University, Shanghai 200032, China;
5 Research Center on Aging and Medicine, Fudan University, Shanghai 200032, China
Funds: This work was supported by the National Natural Science Foundation of China (NSFC No. 81322003, No. 31571527, N.S.
No. 31501098, Q.L.
No. 81570771 and 31871189, RZ.Q.), the Science and Technology Commission of Shanghai Municipality (No. 17XD1400300, No. 17JC1400200), the National Key R&D Program of China 2018YFC2000202, and the Haiju program of National Children's Medical Center EK1125180102. We apologize to people whose work was relevant to but not cited in this study due to limited space.
No. 81870600, C.L.
No. 81500241, C.X.
Received Date: 2019-11-03
Rev Recd Date:2020-03-18
Abstract
Abstract
Dysregulation of circadian rhythms associates with cardiovascular disorders. It is known that deletion of the core circadian gene Bmal1 in mice causes dilated cardiomyopathy. However, the biological rhythm regulation system in mouse is very different from that of humans. Whether BMAL1 plays a role in regulating human heart function remains unclear. Here we generated a BMAL1 knockout human embryonic stem cell (hESC) model and further derived human BMAL1 deficient cardiomyocytes. We show that BMAL1 deficient hESC-derived cardiomyocytes exhibited typical phenotypes of dilated cardiomyopathy including attenuated contractility, calcium dysregulation, and disorganized myofilaments. In addition, mitochondrial fission and mitophagy were suppressed in BMAL1 deficient hESC-cardiomyocytes, which resulted in significantly attenuated mitochondrial oxidative phosphorylation and compromised cardiomyocyte function. We also found that BMAL1 binds to the E-box element in the promoter region of BNIP3 gene and specifically controls BNIP3 protein expression. BMAL1 knockout directly reduced BNIP3 protein level, causing compromised mitophagy and mitochondria dysfunction and thereby leading to compromised cardiomyocyte function. Our data indicated that the core circadian gene BMAL1 is critical for normal mitochondria activities and cardiac function. Circadian rhythm disruption may directly link to compromised heart function and dilated cardiomyopathy in humans.Keywords: circadian gene BMAL1,
human embryonic stem cells,
cell differentiation,
cardiomyocytes,
dilated cardiomyopathy,
mitochondria
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