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Hypoxic regulation of hand1 controls the fetal-neonatal switch in cardiac metabolism.

Abstract：

:Cardiomyocytes are vulnerable to hypoxia in the adult, but adapted to hypoxia in utero. Current understanding of endogenous cardiac oxygen sensing pathways is limited. Myocardial oxygen consumption is determined by regulation of energy metabolism, which shifts from glycolysis to lipid oxidation soon after birth, and is reversed in failing adult hearts, accompanying re-expression of several "fetal" genes whose role in disease phenotypes remains unknown. Here we show that hypoxia-controlled expression of the transcription factor Hand1 determines oxygen consumption by inhibition of lipid metabolism in the fetal and adult cardiomyocyte, leading to downregulation of mitochondrial energy generation. Hand1 is under direct transcriptional control by HIF1α. Transgenic mice prolonging cardiac Hand1 expression die immediately following birth, failing to activate the neonatal lipid metabolising gene expression programme. Deletion of Hand1 in embryonic cardiomyocytes results in premature expression of these genes. Using metabolic flux analysis, we show that Hand1 expression controls cardiomyocyte oxygen consumption by direct transcriptional repression of lipid metabolising genes. This leads, in turn, to increased production of lactate from glucose, decreased lipid oxidation, reduced inner mitochondrial membrane potential, and mitochondrial ATP generation. We found that this pathway is active in adult cardiomyocytes. Up-regulation of Hand1 is protective in a mouse model of myocardial ischaemia. We propose that Hand1 is part of a novel regulatory pathway linking cardiac oxygen levels with oxygen consumption. Understanding hypoxia adaptation in the fetal heart may allow development of strategies to protect cardiomyocytes vulnerable to ischaemia, for example during cardiac ischaemia or surgery.

journal_name

PLoS Biol

journal_title

PLoS biology

authors

Breckenridge RA,Piotrowska I,Ng KE,Ragan TJ,West JA,Kotecha S,Towers N,Bennett M,Kienesberger PC,Smolenski RT,Siddall HK,Offer JL,Mocanu MM,Yelon DM,Dyck JR,Griffin JL,Abramov AY,Gould AP,Mohun TJ

doi

10.1371/journal.pbio.1001666

subject

Has Abstract

pub_date

2013-09-01 00:00:00

pages

e1001666

issue

eissn

1544-9173

issn

1545-7885

pii

PBIOLOGY-D-13-00164

journal_volume

pub_type

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Hypoxic regulation of hand1 controls the fetal-neonatal switch in cardiac metabolism.