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The effect of insulin and insulin-like growth factors on the expression of steroidogenic enzymes in a human ovarian thecal-like tumor cell model.

Abstract：

OBJECTIVE:To determine the effects of insulin and insulin-like growth factors (IGF-I and IGF-II) on steroidogenesis and steroidogenic enzyme expression in a human ovarian thecal-like tumor cell culture model system. DESIGN:Human ovarian thecal-like tumor cells treated with forskolin and insulin IGF-I or IGF-II were evaluated for media accumulation of P and androstenedione (A) as well as 3 beta-hydroxysteroid dehydrogenase (3 beta HSD) and cytochrome P450 17 alpha-hydroxylase (P450c17) enzyme activity. Northern analysis of cytochrome P450 side chain cleavage (P450scc), P450c17, and 3 beta HSD messenger RNA (mRNA) also was performed. RESULTS:Basal hormone secretion, enzyme activity, and mRNA levels were not affected by treatment with insulin or the IGFs. Forskolin treatment stimulated steroid production, enzyme activity, and mRNA content. Forskolin-stimulated P secretion was augmented 30% by treatment with insulin and IGFs, whereas 3 beta HSD activity was augmented twofold to threefold. Forskolin stimulated A and P450c17 activity were enhanced by treatment with insulin and the IGFs. In forskolin-treated cells. P450c17 and P450scc mRNA levels were not affected by insulin (100 nM) or IGF (10 nM) treatment; however, 3 beta HSD mRNA levels were augmented by treatment with insulin and IGFs. CONCLUSIONS:We observed that forskolin-stimulated human ovarian thecal-like tumor cell steroidogenesis, P450c17, and 3 beta HSD activity, as well as mRNA content for P450scc, 3 beta HSD, and P450c17. Insulin and the IGFs augmented forskolin-stimulated production of P and the expression of 3 beta HSD, with little effect on A production, P450scc, or P450c17 expression.

journal_name

Fertil Steril

journal_title

Fertility and sterility

authors

McGee EA,Sawetawan C,Bird I,Rainey WE,Carr BR

doi

10.1016/s0015-0282(16)58032-7

subject

Has Abstract

pub_date

1996-01-01 00:00:00

pages

87-93

issue

1

eissn

0015-0282

issn

1556-5653

pii

S0015-0282(16)58032-7

journal_volume

65

pub_type

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