FOXO3a transcriptionally upregulated PARKIN, which attenuated angiotensin II-induced cardiac hypertrophy and improved cardiac function by restoring mitophagy.
Does PARKIN overexpression prevent Angiotensin II-induced cardiac hypertrophy in preclinical models?
The study reveals a novel mechanism where FOXO3a-dependent PARKIN expression protects against cardiac hypertrophy by restoring mitophagy, suggesting a potential therapeutic target for heart failure.
BACKGROUND: Sustained cardiac hypertrophy often develops maladaptive myocardial remodeling, and eventually progresses to heart failure and sudden death. Therefore, maladaptive hypertrophy is considered as a critical therapeutic target for many heart diseases. Mitophagy, a crucial mechanism in mitochondria quality control and cellular homeostasis, has been implicated in diverse cardiac disorders such as myocardial infarction, diabetic cardiomyopathy, cardiac hypertrophy and heart failure. However, what role mitophagy plays in heart diseases remains an enigma. PARKIN functions as an E3 ubiquitin protein ligase and mediates mitophagy cascades. It is still unclear whether PARKIN participates in the regulation of cardiac hypertrophy. RESULTS: PARKIN was downregulated in cardiomyocytes and hearts under hypertrophic stress. Enforced expression of PARKIN inhibited Ang II-induced cardiomyocyte hypertrophy. Compared to wide-type mice with Ang II-induced cardiac hypertrophy, Parkin transgenic mice subjected to Ang II administration showed attenuated cardiac hypertrophy and improved cardiac function. In addition, mitophagy machinery was impaired in response to Ang II, which was rescued by overexpression of PARKIN. PARKIN exerted the anti-hypertrophy effect through restoring mitophagy. In further exploring the underlying mechanisms, we found that PARKIN was transcriptionally activated by FOXO3a. FOXO3a promoted mitophagy and suppressed cardiac hypertrophy by targeting Parkin. CONCLUSIONS: The present study reveals a novel cardiac hypertrophy regulating model composed of FOXO3a, PARKIN and mitophagy program. Modulation of their levels may provide a new approach for preventing cardiac hypertrophy and heart failure.
Sun et al. (Mon,) conducted a other in Cardiac hypertrophy. PARKIN and FOXO3a overexpression vs. Wild-type mice or negative control adenovirus was evaluated on Cardiac hypertrophy and mitophagy markers. FOXO3a transcriptionally upregulated PARKIN, which attenuated angiotensin II-induced cardiac hypertrophy and improved cardiac function by restoring mitophagy.