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  • Title: Thyroid hormone differentially affects mRNA levels of Ca-ATPase isozymes of sarcoplasmic reticulum in fast and slow skeletal muscle.
    Author: Simonides WS, van der Linden GC, van Hardeveld C.
    Journal: FEBS Lett; 1990 Nov 12; 274(1-2):73-6. PubMed ID: 2147661.
    Abstract:
    mRNA levels for the type I and type II isoforms of sarcoplasmic reticulum (SR) Ca-ATPase were determined in soleus (SOL) and extensor digitorum longus (EDL) muscle of euthyroid (normal), hypothyroid, and hyperthyroid rats. Total Ca-ATPase mRNA content of hyperthyroid muscle was 1.5-fold (EDL) and 6-fold (SOL) higher compared to hypothyroid muscle, with corresponding increases in total SR Ca-ATPase activity. EDL contained only type II Ca-ATPase mRNA. In SOL type I mRNA was the major form in hypothyroidism (98%), but the type II mRNA content was stimulated 150-fold by T3, accounting for 50% of the Ca-ATPase mRNA in hyperthyroidism.
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