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Thyroid hormones differentially affect sarcoplasmic reticulum function in rat atria and ventricles

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Abstract

The present study was undertaken to compare the effects of hypothyroidism and hyperthyroidism on sarcoplasmic reticulum (SR) Ca2+-pump activity, together with assessment of the functional role of SR in providing activator Ca2+ under these altered thyroid states. In response to a shift from hypothyroid to hyperthyroid state, a 10 fold and 2 fold increase in SR Ca2+-pump activity in atria and ventricles, respectively, were observed. This was associated with the 8-9 fold increases in atrial contractility (+dT/dt) and relaxation (-dT/dt), but only with a 3-4 fold increase in their ventricular counterparts. Also, the recirculation fraction of activator Ca2+ (RFA) increased to a far greater extent in atria (4 fold) than in papillary muscles, and the relative increment in inhibition of developed tension by ryanodine became 3 times larger in atria than in papillary muscles. A positive force-frequency relationship (FFR) was observed in hypothyroid atria, whereas the hyperthyroid atria, hypothyroid and hyperthyroid papillary muscles showed a negative FFR. These results suggest the greater role of transsarcolemmal (SL) Ca2+ and smaller role of SR Ca2+ in activating contraction in hypothyroid atria compared to other preparations. Thyroid hormones decrease the contribution of SL and increase that of SR in providing activator Ca2+ to the greater extent in atria than in ventricles. This effect of thyroid hormones is based on larger stimulation of SR Ca2+-pump in atria compared to ventricles.

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Authors and Affiliations

  1. Department of Pathophysiology, University of Tartu, EE2400, Tartu, Estonia

    Allen Kaasik, Ave Minajeva, Kalju Paju, Margus Eimre & Enn K. Seppet

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  1. Allen Kaasik
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  2. Ave Minajeva
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Kaasik, A., Minajeva, A., Paju, K. et al. Thyroid hormones differentially affect sarcoplasmic reticulum function in rat atria and ventricles. Mol Cell Biochem 176, 119–126 (1997). https://doi.org/10.1023/A:1006887231150

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