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• W2999692384 abstract "ABSTRACT Aims The abundance of beta3-adrenergic receptors (β3-ARs) is upregulated in diseased human myocardium. We previously showed that cardiac-specific expression of β3-AR inhibits the hypertrophic response to neurohormonal stimulation. Here, we further analyzed signalling pathways involved in the anti-hypertrophic effect of β3-AR. Methods In vitro hypertrophic responses to phenylephrine (PE) were analyzed in neonatal rat ventricular myocytes (NRVM) infected with a recombinant adenovirus expressing the human β3-AR (AdVhβ3). We confirmed results in mice with cardiomyocyte-specific moderate expression of human β3-AR (β3-TG) and WT littermates submitted to thoracic transverse aortic constriction (TAC) for 9 weeks. Results We observed a colocalization of β3-AR with the AMP-activated protein kinase (AMPK) both in neonatal rat andin adult mouse cardiomyocytes. Treatment of NRVM with PE induced hypertrophy and a decrease in phosphorylation of Thr172-AMPK (/2, p=0.0487) and phosphorylation of Ser79- acetyl-CoA carboxylase (ACC) (/2.6, p=0.0317), inducing an increase in phosphorylated Ser235/236 S6 protein (x2.5, p=0.0367) known to be involved in protein synthesis. These effects were reproduced by TAC in WT mice, but restored to basal levels in β3-AR expressing cells/mice. siRNA targeting of AMPK partly abrogated the anti-hypertrophic effect of β3-AR in response to PE in NRVM (x1.3, p<0.0001). Concomitant with hypertrophy, autophagy measured by microtubule-associated protein 1 light chain 3 (LC3)-II/LC3-I ratio and p62 abundance was decreased by PE in NRVM (/2.6, p=0.0010 and x3, p=0.0016, respectively) or TAC in WT mice (/5.4, p=0.0159); and preserved in human β3-AR expressing cells and mice, together with reduced hypertrophy. Conclusions Cardiac-specific moderate expression of β3-AR inhibits the hypertrophic response in part through AMPK activation followed byinhibition of protein synthesis and preservation of autophagy. Activation of the cardiac β3-AR pathway may provide future therapeutic avenues for the modulation of hypertrophic remodelling." @default.
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• W2999692384 date "2020-01-14" @default.
• W2999692384 modified "2023-10-14" @default.
• W2999692384 title "Beta-3 Adrenoreceptors protect from hypertrophic remodelling through AMP-Activated Protein Kinase and Autophagy" @default.
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• W2999692384 doi "https://doi.org/10.1101/2020.01.14.905893" @default.
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