Published online before print May 15, 2003, doi: 10.1161/01.RES.0000077045.84609.9F
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Submitted on December 27, 2002
Revised on May 1, 2003
Accepted on May 5, 2003
NFATc3 and NFATc4 Are Required for Cardiac Development and Mitochondrial Function
Paul B. Bushdid ;
From the Divisions of Molecular Cardiovascular Biology (P.B.B., H.O., J.D.M., K.E.Y.) and Developmental Biology (R.R.W.), Children's Hospital Medical Center Cincinnati, Cincinnati, Ohio.
* To whom correspondence should be addressed. E-mail: yutzey{at}chmcc.org.
Activation of the nuclear factor of activated T-cell (NFAT) family of transcription factors is associated with changes in gene expression and myocyte function in adult cardiac and skeletal muscle. However, the role of NFATs in normal embryonic heart development is not well characterized. In this report, the function of NFATc3 and NFATc4 in embryonic heart development was examined in mice with targeted disruption of both nfatc3 and nfatc4 genes. The nfatc3-/-nfatc4-/- mice demonstrate embryonic lethality after embryonic day 10.5 and have thin ventricles, pericardial effusion, and a reduction in ventricular myocyte proliferation. Cardiac mitochondria are swollen with abnormal cristae, indicative of metabolic failure, but hallmarks of apoptosis are not evident. Furthermore, enzymatic activity of complex II and IV of the respiratory chain and mitochondrial oxidative activity are reduced in nfatc3-/-nfatc4-/- cardiomyocytes. Cardiac-specific expression of constitutively active NFATc4 in nfatc3-/-nfatc4-/- embryos prolongs embryonic viability to embryonic day 12 and preserves ventricular myocyte proliferation, compact zone density, and trabecular formation. The rescued embryos also maintain cardiac mitochondrial ultrastructure and complex II enzyme activity. Together, these data support the hypothesis that loss of NFAT activity in the heart results in a deficiency in mitochondrial energy metabolism required for cardiac morphogenesis and function.
Key words: nuclear factors of activated T cells • heart development • mitochondria
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