Acetylcholine Attenuates Hypoxia/Reoxygenation Injury by Inducing Mitophagy Through PINK1/Parkin Signal Pathway in H9c2 Cells.

Abstract:

:Acetylcholine (ACh) protected against cardiac injury via promoting autophagy and mitochondrial biogenesis, however, the involvement of mitophagy in ACh-elicited cardioprotection remains unknown. In the present study, H9c2 cardiomyocytes were subjected to hypoxia/reoxygenation (H/R) and ACh treatment during reoxygenation. Mitophagy markers PTEN-induced kinase 1 (PINK1) and Parkin translocation were examined using western blot and confocal fluorescence microscopy. Mitochondrial membrane potential and reactive oxygen species (ROS) were detected with fluorescence staining. We found that H/R-treated cells exhibited reduced levels of PINK1 and Parkin in mitochondria, accompanied with decreased autophagy flux (reduced LC3-II/LC3-I and increased p62). Conversely, ACh increased PINK1 and Parkin translocation to mitochondria and enhanced autophagy proteins. Confocal imaging of Parkin and MitoTracker Green-labeled mitochondria further confirmed ACh-induced mitochondrial translocation of Parkin, which was reversed by M2 receptor antagonist methoctramine and M2 receptor siRNA, suggesting ACh could induce mitophagy by M2 receptor after H/R. Mitophagy inhibitor 3-methaladenine abolished ACh-induced mitoprotection, manifesting as aggravated mitochondrial morphology disruption, ATP and membrane potential depletion, increased ROS overproduction, and apoptosis. Furthermore, PINK1/Parkin siRNA attenuated the protective effects of ACh against ATP loss and oxidative stress due to mitochondrial-dependent injury. Taken together, ACh promoted mitochondrial translocation of PINK1/Parkin to stimulate cytoprotective mitophagy via M2 receptor, which may provide beneficial targets in the preservation of cardiac homeostasis against H/R injury.

journal_name

J Cell Physiol

authors

Sun L,Zhao M,Yang Y,Xue RQ,Yu XJ,Liu JK,Zang WJ

doi

10.1002/jcp.25215

subject

Has Abstract

pub_date

2016-05-01 00:00:00

pages

1171-81

issue

5

eissn

0021-9541

issn

1097-4652

journal_volume

231

pub_type

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