P38? and ? promote heart hypertrophy by targeting the mTOR-inhibitory protein DEPTOR for degradation.

ABSTRACT: Disrupted organ growth leads to disease development. Hypertrophy underlies postnatal heart growth and is triggered after stress, but the molecular mechanisms involved in these processes are largely unknown. Here we show that cardiac activation of p38? and p38? increases during postnatal development and by hypertrophy-inducing stimuli. p38?/? promote cardiac hypertrophy by phosphorylating the mTORC1 and mTORC2 inhibitor DEPTOR, which leads to its degradation and mTOR activation. Hearts from mice lacking one or both kinases are below normal size, have high levels of DEPTOR, low activity of the mTOR pathway and reduced protein synthesis. The phenotype of p38?/?(-/-) mice is reverted by overactivation of mTOR with amino acids, shRNA-mediated knockdown of Deptor, or cardiomyocyte overexpression of active p38? and p38?. Moreover, in WT mice, heart weight is reduced by cardiac overexpression of DEPTOR. Our results demonstrate that p38?/? control heart growth by modulating mTOR pathway through DEPTOR phosphorylation and subsequent degradation.

SUBMITTER: Gonzalez-Teran B 

PROVIDER: S-EPMC5476828 | biostudies-other | 2016 Jan

REPOSITORIES: biostudies-other