Stimulation of Na(+)-K(+)-ATPase by thyrotropin in cultured thyroid follicular cells.

Stimulation of Na(+)-K(+)-ATPase by thyrotropin in cultured thyroid follicular cells.
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促甲状腺素对培养的甲状腺滤泡细胞中 Na( )-K( )-ATP 酶的刺激。

DOI:
10.1152/ajpcell.1995.268.5.c1252
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发表时间:
1995
期刊:
The American journal of physiology.
影响因子:
--
通讯作者:
Mercer,DW
Mercer,DW
中科院分区:
--
文献类型:
--
作者:
Pressley,TA;Higham,SC;Joson,LA;Mercer,DW

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促甲状腺激素(TSH;促甲状腺素)在甲状腺中产生多效性反应,加速滤泡上皮内代谢周转的几乎每个方面。本实验观察了促甲状腺激素(TSH)对大鼠甲状腺细胞系FRTL-5细胞Na(+)-K(+)-ATP酶表达的影响。TSH(10 mU/ml)产生了近两倍的丰度增加的mRNA编码的催化α 1-亚基在6小时内的治疗。由于有四种编码β 1亚基的mRNA,TSH的丰度显著增加,但这种调节是不协调的,某些物种的增加比其他物种更多。类似的mRNA丰度的增加被腺苷3 ',5'-环一磷酸第二信使系统的激活剂引起。与α 1-和β 1-mRNA相反,编码β 2-亚基的mRNA的丰度在6小时后与TSH相同,表明促甲状腺激素的作用不是普遍的或不加选择的。促甲状腺素还引起Na(+)-K(+)-ATP酶活性增加76%,48 h后泵介导的转运增加46%。这些研究表明,在激素合成过程中由TSH引发的代谢周转的变化包括N(+)-K+泵的上调。
Thyroid-stimulating hormone (TSH; thyrotropin) produces a pleiotropic response in the thyroid gland, accelerating nearly every aspect of metabolic turnover within the follicular epithelia. We examined the effects of TSH on expression of Na(+)-K(+)-ATPase in FRTL-5 cells, a cell line derived from rat thyroid. TSH (10 mU/ml) produced a nearly twofold increase in abundance of the mRNA encoding the catalytic alpha 1-subunit within 6 h of treatment. With the four mRNAs encoding the beta 1-subunit, TSH produced a striking increase in abundance, but this regulation was discoordinate, and some species increased more than others. Similar increases in mRNA abundance were elicited by activators of the adenosine 3',5'-cyclic monophosphate second messenger system. In contrast to the alpha 1- and beta 1-mRNAs, the abundance of the mRNA encoding the beta 2-subunit was unchanged with TSH after 6 h, indicating that the effects of thyrotropin were not universal or indiscriminate. Thyrotropin also caused a 76% increase in Na(+)-K(+)-ATPase activity and a 46% increase in pump-mediated transport after 48 h. These studies suggest that the changes in metabolic turnover initiated by TSH during hormone synthesis include upregulation of the N(+)-K+ pump.
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