Document Detail

Ovine fetal adrenal maturation at term and during fetal ACTH administration: evidence that the modulating effect of cortisol may involve cAMP.
MedLine Citation:
PMID:  3024788     Owner:  NLM     Status:  MEDLINE    
Exogenous ACTH1-24 promotes adrenal maturation in fetal sheep, and this effect appears to be modulated in part by cortisol (Challis et al. 1985). We have examined whether similar changes in adrenal metabolism of progesterone occur with ACTH-induced labour as at spontaneous term and whether the site of cortisol modulation is on adrenal steroidogenesis or at the level of cAMP generation. Chronically catheterized fetal sheep were infused in utero for 100 h between days 127 and 131 of pregnancy with P-ACTH, P-ACTH + metopirone, P-ACTH + metopirone + cortisol, or saline. After 100 h the metabolism of [3H]progesterone was measured in adrenal homogenates. Similar incubations were performed with adrenal tissue from fetal sheep at day 130 of pregnancy and at spontaneous labour. In the treatment groups of sheep, cAMP output by dispersed adrenal cells in response to ACTH added in vitro was also determined. Similar qualitative patterns of [3H]progesterone metabolism were found in adrenal homogenates after in vivo ACTH or at term. At both times there was an increase in cortisol and in total 17 alpha-hydroxycorticosteroid accumulation and also evidence for increased activity of 11 beta-hydroxylase enzyme. The formation of total 17 alpha-hydroxycorticosteroids was not affected significantly by concurrent treatment in vivo with metopirone +/- cortisol. The accumulation of cAMP in vitro was increased after in vivo ACTH, attenuated after ACTH + metopirone, but statistical significance over controls was restored after ACTH + metopirone + cortisol treatment. We conclude that ACTH-induced labour and spontaneous parturition in sheep is associated with qualitatively similar changes in progesterone metabolism by the fetal adrenal gland.(ABSTRACT TRUNCATED AT 250 WORDS)
J R Challis; S J Lye; J Welsh
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Canadian journal of physiology and pharmacology     Volume:  64     ISSN:  0008-4212     ISO Abbreviation:  Can. J. Physiol. Pharmacol.     Publication Date:  1986 Aug 
Date Detail:
Created Date:  1987-01-30     Completed Date:  1987-01-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372712     Medline TA:  Can J Physiol Pharmacol     Country:  CANADA    
Other Details:
Languages:  eng     Pagination:  1085-90     Citation Subset:  IM    
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MeSH Terms
17-Hydroxycorticosteroids / biosynthesis
Adrenal Glands / embryology*,  metabolism
Adrenocorticotropic Hormone / pharmacology*
Cosyntropin / pharmacology
Cyclic AMP / metabolism
Gestational Age
Hydrocortisone / metabolism,  pharmacology
Metyrapone / pharmacology
Progesterone / metabolism*
Subcellular Fractions / metabolism
Reg. No./Substance:
0/17-Hydroxycorticosteroids; 16960-16-0/Cosyntropin; 50-23-7/Hydrocortisone; 54-36-4/Metyrapone; 57-83-0/Progesterone; 60-92-4/Cyclic AMP; 9002-60-2/Adrenocorticotropic Hormone

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