Hormonal regulation of iodothyronine 5'-deiodinase in rat brown adipose tissue.

Hormonal regulation of iodothyronine 5'-deiodinase in rat brown adipose tissue.
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大鼠棕色脂肪组织中碘甲状腺原氨酸 5-脱碘酶的激素调节。

DOI:
10.1152/ajpendo.1986.251.6.e639
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发表时间:
1986
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Larsen,PR
Larsen,PR
中科院分区:
--
文献类型:
--
作者:
Silva,JE;Larsen,PR

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去甲肾上腺素、异丙肾上腺素、胰岛素和胰高血糖素会增加完整大鼠棕色脂肪组织 (BAT) 中的 II 型(低 Km)碘甲腺原氨酸 5'-脱碘酶 (5'-D)。放线菌酮或放线菌素 D 可阻断去甲肾上腺素后的增加,表明这种作用需要新的 mRNA 合成。给予胰岛素后 BAT 5'-D 增加 3 至 10 倍也被放线菌酮阻断。所有刺激剂的作用都会因禁食或链脲佐菌素诱发的糖尿病而减弱。虽然所有这些激素都有可能刺激 BAT 5'-D,但剂量反应关系表明去甲肾上腺素和胰岛素是最有效的。这些和我们早期的研究显示甲状腺和生长激素对 BAT 5'-D 的额外影响表明这种酶的复杂调节,表明其作用产生的三碘甲状腺原氨酸在该组织的产热反应中具有重要作用。
Norepinephrine, isoproterenol, insulin, and glucagon increase the type II (low Km) iodothyronine 5'-deiodinase (5'-D) in the brown adipose tissue (BAT) of intact rats. Cycloheximide or actinomycin D blocks the increase after norepinephrine, suggesting new mRNA synthesis is required for this effect. The 3- to 10-fold increase in BAT 5'-D after insulin administration was also blocked by cycloheximide. The effects of all stimulators are blunted by fasting or streptozotocin-induced diabetes. While all these hormones have the potential for stimulating BAT 5'-D, the dose-response relationships suggest that norepinephrine and insulin are the most potent. These and our earlier studies showing additional effects of thyroid and growth hormones on BAT 5'-D point to the complex regulation of this enzyme, suggesting that the triiodothyronine produced from its action has an important role in the thermogenic response of this tissue.
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