Thyroid hormone inhibits proliferation of fetal cardiac myocytes in vitro

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37 Scopus citations


Thyroid hormone (T3) is a key regulator of fetal organ maturation. Premature elevations of thyroid hormone may lead to a 'mature' cardio-phenotype. Thyroid hormone win stimulate maturation of ovine fetal cardiomyocytes in culture by decreasing their proliferative capacity. Group 1 fetal cardiomyocytes (∼ 135 days gestation) were incubated with T3 (1.5, 3, 10, and 100 nM) and bromodeoxyuridine (BrdU; 10 μM) for 24 and 48 h. Group 2 cardiomyocytes were cultured with T3 alone for later protein analysis of cell cycle regulators. At all concentrations, T3 decreased BrdU uptake fourfold in serum media (P<0.001 versus serum, n=5). Following serum-free (SF) T3 treatment, BrdU uptake was inhibited when compared with serum (P<0.001 versus serum, n=5). p21 expression increased threefold (P<0.05 versus serum free, n=4) and cyclin D1 expression decreased twofold (P<0.05 versus serum, n=4) in T3-treated cardiomyocytes. (1) T3 inhibits fetal cardiomyocyte proliferation, while (2) p21 protein levels increase, and (3) cyclin D1 levels decrease. Thus, T3 may be a potent regulator of cardiomyocyte proliferation and maturation in the late gestation fetus.

Original languageEnglish (US)
Pages (from-to)R1-R8
JournalJournal of Endocrinology
Issue number2
StatePublished - Feb 2007

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology


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