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An autocrine progesterone positive feedback loop mediates oxytocin upregulation in bovine granulosa cells during luteinization.
被引:42
作者:
Lioutas, C
Einspanier, A
Kascheike, B
Walther, N
Ivell, R
机构:
[1] UNIV HAMBURG, INST HORMONE & FERTIL RES, IHF, D-22529 HAMBURG, GERMANY
[2] GERMAN PRIMATE CTR, DEPT REPROD BIOL, GOTTINGEN, GERMANY
关键词:
D O I:
10.1210/en.138.11.5059
中图分类号:
R5 [内科学];
学科分类号:
1002 ;
100201 ;
摘要:
During luteinization of bovine granulosa cells in vitro in the presence of insulin, or insulin plus forskolin, there is a massive upregulation not only of progesterone production, but also of the gene for the peptide hormone oxytocin, with secretion of the peptide into the medium. By using the progesterone receptor antagonists, RU486 or onapristone, we have shown that this upregulation of the oxytocin gene is mediated by an autocrine loop involving endogenous progesterone and the progesterone receptor in the granulosa cells. The inhibition of oxytocin gene expression by the anti-gestagens can be reversed by medroxyprogesterone acetate but not by dexamethasone, showing that the effect is due to the endogenous progesterone. Since oxytocin also appears to be involved in a positive feedback loop regulating steroid output, these results show that endogenous progesterone itself is a key feedback element in the cascade of events termed luteinization, and that possibly anti-gestagens can influence ovarian function in vivo by directly disrupting this process.
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页码:5059 / 5062
页数:4
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