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Infrarenal heterotopic cardiac isografts maintain structural and functional integrity. We have used this transplantation model to further explore the mechanisms of thyroid hormone-induced cardiac hypertrophy. Thyroid hormone administration, 1-thyroxine (T4) 10 micrograms/animal per d, led to a significant 30% increase in total heart weight and a 40% increase in the myosin content of the in situ heart when compared with control. In contrast, T4 treatment was without effect on the heart weight, protein content, rate of protein synthesis, or calculated myosin content of the heterotopic, nonworking heart. Heterotopic hearts demonstrated a significant decrease in the percentage of the V1 myosin isoenzyme from 95% to 61%. This shift occurred in euthyroid animals but was prevented by T4 treatment. These results suggest that thyroxine-induced cardiac hypertrophy is mediated indirectly via changes in cardiac work. Myosin isoenzyme expression can be altered by changes in work load but is still responsive to increased levels of thyroid hormone.


I Klein, C Hong


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Citations to this article in year 2009 (2)

Title and authors Publication Year
Divergent regulation of cardiac KCND3 potassium channel expression by the thyroid hormone receptors alpha1 and beta1
N Gassanov, F Er, G Michels, N Zagidullin, MC Brandt, UC Hoppe
The Journal of Physiology 2009
Thyroid hormones and the cardiovascular system: Pathophysiology and interventions
G Cini, A Carpi, J Mechanick, L Cini, M Camici, F Galetta, R Giardino, MA Russo, G Iervasi
Biomedicine & Pharmacotherapy 2009