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Activation of Autophagy Ameliorates Cardiomyopathy in Mybpc3-Targeted Knockin Mice.

ABSTRACT: BACKGROUND:Alterations in autophagy have been reported in hypertrophic cardiomyopathy (HCM) caused by Danon disease, Vici syndrome, or LEOPARD syndrome, but not in HCM caused by mutations in genes encoding sarcomeric proteins, which account for most of HCM cases. MYBPC3, encoding cMyBP-C (cardiac myosin-binding protein C), is the most frequently mutated HCM gene. METHODS AND RESULTS:We evaluated autophagy in patients with HCM carrying MYBPC3 mutations and in a Mybpc3-targeted knockin HCM mouse model, as well as the effect of autophagy modulators on the development of cardiomyopathy in knockin mice. Microtubule-associated protein 1 light chain 3 (LC3)-II protein levels were higher in HCM septal myectomies than in nonfailing control hearts and in 60-week-old knockin than in wild-type mouse hearts. In contrast to wild-type, autophagic flux was blunted and associated with accumulation of residual bodies and glycogen in hearts of 60-week-old knockin mice. We found that Akt-mTORC1 (mammalian target of rapamycin complex 1) signaling was increased, and treatment with 2.24 mg/kg·d rapamycin or 40% caloric restriction for 9 weeks partially rescued cardiomyopathy or heart failure and restored autophagic flux in knockin mice. CONCLUSIONS:Altogether, we found that (1) autophagy is altered in patients with HCM carrying MYBPC3 mutations, (2) autophagy is impaired in Mybpc3-targeted knockin mice, and (3) activation of autophagy ameliorated the cardiac disease phenotype in this mouse model. We propose that activation of autophagy might be an attractive option alone or in combination with another therapy to rescue HCM caused by MYBPC3 mutations.

SUBMITTER: Singh SR

PROVIDER: S-EPMC5679453 | biostudies-other | 2017 Oct

REPOSITORIES: biostudies-other

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Activation of Autophagy Ameliorates Cardiomyopathy in <i>Mybpc3</i>-Targeted Knockin Mice.

Singh Sonia R SR Zech Antonia T L ATL Geertz Birgit B Reischmann-Düsener Silke S Osinska Hanna H Prondzynski Maksymilian M Krämer Elisabeth E Meng Qinghang Q Redwood Charles C van der Velden Jolanda J Robbins Jeffrey J Schlossarek Saskia S Carrier Lucie L

Circulation. Heart failure 20171001 10

<h4>Background</h4>Alterations in autophagy have been reported in hypertrophic cardiomyopathy (HCM) caused by Danon disease, Vici syndrome, or LEOPARD syndrome, but not in HCM caused by mutations in genes encoding sarcomeric proteins, which account for most of HCM cases. <i>MYBPC3</i>, encoding cMyBP-C (cardiac myosin-binding protein C), is the most frequently mutated HCM gene.<h4>Methods and results</h4>We evaluated autophagy in patients with HCM carrying <i>MYBPC3</i> mutations and in a <i>Myb ...[more]

PMID: 29021349

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Project description:ObjectivesWe investigated the effect of reducing mitochondrial oxidative stress by the mitochondrial-targeted antioxidant peptide SS-31 in hypertensive cardiomyopathy.BackgroundOxidative stress has been implicated in hypertensive cardiovascular diseases. Mitochondria and nicotinamide adenine dinucleotide phosphate (NADPH) oxidase have been proposed as primary sites of reactive oxygen species (ROS) generation.MethodsThe mitochondrial targeted antioxidant peptide SS-31 was used to determine the role of mitochondrial oxidative stress in angiotensin II (Ang)-induced cardiomyopathy as well as in Gαq overexpressing mice with heart failure.ResultsAng induces mitochondrial ROS in neonatal cardiomyocytes, which is prevented by SS-31, but not the nontargeted antioxidant N-acetyl cysteine (NAC). Continuous administration of Ang for 4 weeks in mice significantly increased both systolic and diastolic blood pressure, and this was not affected by SS-31 treatment. Ang was associated with up-regulation of NADPH oxidase 4 (NOX4) expression and increased cardiac mitochondrial protein oxidative damage, and induced the signaling for mitochondrial biogenesis. Reducing mitochondrial ROS by SS-31 substantially attenuated Ang-induced NOX4 up-regulation, mitochondrial oxidative damage, up-regulation of mitochondrial biogenesis, and phosphorylation of p38 mitogen-activated protein kinase and prevented apoptosis, concomitant with amelioration of Ang-induced cardiac hypertrophy, diastolic dysfunction, and fibrosis, despite the absence of blood pressure-lowering effect. The NAC did not show any beneficial effect. The SS-31 administration for 4 weeks also partially rescued the heart failure phenotype of Gαq overexpressing mice.ConclusionsMitochondrial targeted peptide SS-31 ameliorates cardiomyopathy resulting from prolonged Ang stimulation as well as Gαq overexpression, suggesting its potential clinical application for target organ protection in hypertensive cardiovascular diseases.

Dataset Information

Activation of Autophagy Ameliorates Cardiomyopathy in Mybpc3-Targeted Knockin Mice.

Publications

Activation of Autophagy Ameliorates Cardiomyopathy in <i>Mybpc3</i>-Targeted Knockin Mice.

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