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Objective   To study the role of autophagy in angiotensin II-induced cardiac hypertrophy in C57BL/6 mice.Methods   We randomly assigned 10 C57BL/6 mice into the control and angiotensin II (Ang II) groups (n = 5 in each group). Ang II group mice were injected with Ang II (3 mg/kg/day). Cardiac structure, myocardial pathological changes, mitochondrial structure, autophagosomes, mitochondrial membrane potential (MMP), and myocardial apoptosis were examined. Phosphatase and tensin homolog (PTEN)-induced putative kinase 1 (PINK1), Parkin, and microtubule-associated protein1A/1B-light chain 3 (LC3) II protein expression levels and mRNA expression of atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP) were examined.Results   The heart weight/body weight ratio, posterior wall of the left ventricle, myocardial apoptosis (%), relative number of autophagosomes, ANP and BNP mRNA levels, and PINK1, Parkin, and LC3 II protein levels were significantly higher in the Ang II group than in the control group. The MMP and left ventricular ejection fraction were significantly lower in the Ang II group than in the control group. There was disordered arrangement of cardiomyocytes and mitochondria, and obvious mitochondrial swelling, cardiomyocyte hypertrophy, and fibrosis in the Ang II group.Conclusion   PINK1/PARKIN-mediated autophagy is involved in Ang II-induced cardiac hypertrophy by affecting myocardial apoptosis and mitochondrial function.

journal of international medical research

Involvement of phosphatase and tensin homolog-induced putative kinase 1/Parkin-mediated autophagy in angiotensin II-induced cardiac hypertrophy in C57BL/6 mice