Abstract:
:Evidence that transforming growth factor-beta (TGF beta) is produced by porcine thecal cells and acts upon porcine granulosa cells suggests that this peptide may be a local regulator of follicular function in this species. The objective of the present study was to investigate the effects of TGF beta on steroidogenesis in thecal cells from 4-6 mm follicles of prepubertal gilts. In this culture system, cells undergo functional luteinization such that production of androstenedione, the major steroid product in 24 h incubations, declines, and in the presence of luteinizing hormone (LH) (250 ng/ml) and insulin (1 micrograms/ml), progesterone production increases over a 3-day culture period. TGF beta (0.1-10 ng/ml) had no effect on production of androstenedione from endogenous precursors in the presence or absence of LH, although there was a slight inhibition of androstenedione production in the presence of exogenous progesterone (up to 23%). As the cells luteinized in culture, the increase in progesterone production in response to LH increased (day 1, 4.4-fold; day 3, 13-fold). TGF beta at concentrations as low as 0.1 ng/ml caused marked (up to 90%) inhibition of LH-stimulated progesterone production in day 3 cultures. In the presence of TGF beta (10 ng/ml), the response to LH was completely abolished, and the response to dibutyryl cAMP was considerably attenuated (25% of controls). Since the primary site of action of TGF beta appeared to be distal to cAMP formation, the effect of TGF beta on conversion of exogenous 22-hydroxy-cholesterol and pregnenolone to progesterone was determined in day 3 cultures. 22-Hydroxycholesterol and pregnenolone restored progesterone production to at least 80% and 89% of controls, respectively. While the primary inhibitory action of TGF beta appears to be exerted distal to cAMP formation, neither cholesterol sidechain cleavage nor the 3 beta-hydroxysteroid dehydrogenase: delta 5-delta 4 isomerase reactions are primary targets of this factor. Together with evidence of thecal production of TGF beta, the results of this study indicate that this peptide may be an autocrine regulator of thecal steroidogenesis.
journal_name
Mol Cell Endocrinoljournal_title
Molecular and cellular endocrinologyauthors
Engelhardt H,Tekpetey FR,Gore-Langton RE,Armstrong DTdoi
10.1016/0303-7207(92)90131-okeywords:
subject
Has Abstractpub_date
1992-05-01 00:00:00pages
117-26issue
1-2eissn
0303-7207issn
1872-8057journal_volume
85pub_type
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journal_title:Molecular and cellular endocrinology
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doi:10.1016/0303-7207(96)03842-7
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journal_title:Molecular and cellular endocrinology
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更新日期:1993-08-01 00:00:00
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更新日期:2004-07-30 00:00:00
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更新日期:1981-08-01 00:00:00
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journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
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更新日期:1993-02-01 00:00:00
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journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
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更新日期:1990-01-22 00:00:00
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pub_type: 杂志文章
doi:10.1016/s0303-7207(97)04026-4
更新日期:1997-04-04 00:00:00
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journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
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更新日期:1979-05-01 00:00:00
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pub_type: 杂志文章
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更新日期:1975-05-01 00:00:00
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pub_type: 杂志文章
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更新日期:1976-08-01 00:00:00
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pub_type: 杂志文章
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更新日期:2002-03-28 00:00:00
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pub_type: 杂志文章
doi:10.1016/0303-7207(91)90010-p
更新日期:1991-11-01 00:00:00
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journal_title:Molecular and cellular endocrinology
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更新日期:2005-10-20 00:00:00
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pub_type: 杂志文章,评审
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更新日期:2006-05-16 00:00:00
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journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(93)90045-l
更新日期:1993-07-01 00:00:00
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pub_type: 杂志文章,评审
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更新日期:2001-06-10 00:00:00
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journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
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更新日期:1988-12-01 00:00:00
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journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
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更新日期:2007-03-15 00:00:00
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journal_title:Molecular and cellular endocrinology
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更新日期:1979-08-01 00:00:00
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journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
doi:10.1016/0303-7207(82)90110-1
更新日期:1982-07-01 00:00:00
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更新日期:2016-03-05 00:00:00
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更新日期:2015-01-05 00:00:00
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更新日期:2010-06-30 00:00:00
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journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章
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更新日期:1979-08-01 00:00:00
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pub_type: 杂志文章,评审
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更新日期:2010-11-25 00:00:00
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journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.mce.2003.12.020
更新日期:2004-12-30 00:00:00
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journal_title:Molecular and cellular endocrinology
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更新日期:2020-12-01 00:00:00
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journal_title:Molecular and cellular endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.mce.2008.04.002
更新日期:2008-10-10 00:00:00