Effect of thyroid hormones on the gene expression of calcium transport systems in rat muscles.
It has been previously shown that modification of thyroid hormone levels have a profound impact on cardiac function, predominantly through a direct regulation of the sarcoplasmic reticulum protein levels. Nevertheless, little is known about the regulation of calcium transport systems in skeletal muscle due to the altered concentration of thyroid hormones. Thus, the goal of our study was to find out whether altered thyroid status could change the gene expression of the Na(+)/Ca(2+) exchanger (NCX), the inositol 1,4,5-trisphosphate (IP(3)) receptors and ryanodine receptors (RyRs) in slow and fast skeletal muscles of rats. A hyperthyroid state was maintained in rats by triiodothyronine (T(3)) administration, while methimazole was employed for inducing hypothyroidism. After a period of 2-10 months of T(3) treatment we observed a significant increase in mRNA levels of the NCX, RyRs and IP(3) receptors. This increase was more pronounced in the slow soleus than in the fast extensor digitorum longus (EDL) muscle. It is tempting to speculate that thyroid hormones also alter calcium concentration and thus influence the process of excitation-contraction coupling in the skeletal muscle.
Hudecova
Sona
S
Institute of Molecular Physiology and Genetics, Slovak Academy of Sciences, Vlarska 5, 833 34 Bratislava, Slovak Republic.
Vadaszova
Adriana
A
Soukup
Tomas
T
Krizanova
Olga
O
D000818:Animals; D005260:Female; D005786:Gene Expression Regulation; D015544:Inositol 1,4,5-Trisphosphate / Q000032:analysis; D018482:Muscle, Skeletal / Q000378:metabolism*; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats; D017208:Rats, Wistar; D019837:Ryanodine Receptor Calcium Release Channel / Q000235:genetics*; D019831:Sodium-Calcium Exchanger / Q000235:genetics*; D013963:Thyroid Hormones / Q000502:physiology*; D014284:Triiodothyronine / Q000494:pharmacology
D012333:RNA, Messenger; D019837:Ryanodine Receptor Calcium Release Channel; D019831:Sodium-Calcium Exchanger; D013963:Thyroid Hormones; D014284:Triiodothyronine; D015544:Inositol 1,4,5-Trisphosphate