Developmental and hormonal regulation of mRNAs for insulin-like growth factor II and steroidogenic enzymes in human fetal adrenals and gonads.

Developmental and hormonal regulation of mRNAs for insulin-like growth factor II and steroidogenic enzymes in human fetal adrenals and gonads.
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人胎儿肾上腺和性腺中胰岛素样生长因子 II 和类固醇生成酶 mRNA 的发育和激素调节。

DOI:
10.1089/dna.1988.7.9
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发表时间:
1988
期刊:
DNA (Mary Ann Liebert, Inc.)
影响因子:
--
通讯作者:
Miller,WL
Miller,WL
中科院分区:
--
文献类型:
--
作者:
Voutilainen,R;Miller,WL

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胰岛素样生长因子II(IGF-II)在人胎儿性腺和肾上腺中受到发育和激素的调节。IGF-II在人胎儿肾上腺RNA中的丰度最高,其次是胎肝、睾丸、胎盘和卵巢。胎儿睾丸IGF-IImRNA随着胎龄的增加而显著下降,与我们之前测量的类固醇生成酶P450scc(胆固醇侧链裂解酶)和P450Cl7(17α-羟基酶/17,20裂解酶)的mRNAs平行(J.内分泌激素。梅塔布。63、1145、1986)。0.5mMcAMP可使培养的胎儿睾丸细胞P450scc和P450cl7mRNAs的丰度分别增加2.5倍(p<0.01)和9.2倍(p<0.001),但不影响IGF-II的mRNAs丰度。这表明IGF-II基因在胎儿睾丸中的调控与在胎儿肾上腺、胎盘或成人颗粒细胞中不同,我们先前已经证明,ACTH、cAMP和促性腺激素分别增加IGF-II mRNA的积累(proc。娜塔莉。阿卡德。SCI。美国84、1590、1987)。外源性添加IGF-I和IGF-II对ACTH刺激的胎儿肾上腺细胞中P450cl7或P450c21(21-羟基酶)的mRNAs无影响,但可降低IGF-IImRNA。因此,IGFS似乎对IGF-II mRNA的积累具有短环反馈抑制作用。
Insulin-like growth factor II (IGF-II) is regulated developmentally and hormonally in human fetal gonads and adrenals. The abundance of IGF-II mRNA is greatest in RNA from human fetal adrenals, followed by fetal liver, testis, placenta, and ovaries. Fetal testicular IGF-II mRNA decreases significantly with increasing gestational age, in parallel with our previous measurements of the mRNAs for the steroidogenic enzymes P450scc (cholesterol side-chain cleavage enzyme) and P450cl7 (17α-hydroxylase/17,20 lyase) (J. Clin. Endocrinol. Metab. 63, 1145, 1986). The abundances of P450scc and P450cl7 mRNAs in cultured fetal testis cells rose 2.5-fold (p< 0.01) and 9.2-fold (p< 0.001), respectively, in response to 0.5 mMcAMP, but the abundance of IGF-II mRNA was not affected. This suggests that the IGF-II gene is regulated differently in fetal testes than it is in fetal adrenals, placenta, or adult granulosa cells, where we have previously shown that ACTH, cAMP, and gonadotropins, respectively, increase IGF-II mRNA accumulation (Proc. Natl. Acad. Sci. USA 84, 1590, 1987). Exogenously added IGF-I and IGF-II had no effect on mRNAs for P450cl7 or P450c21 (21-hydroxylase), but decreased IGF-II mRNA in ACTH-stimulated fetal adrenal cells. Thus, the IGFs appear to exert short-loop feedback inhibition on accumulation of IGF-II mRNA.
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