Document Detail


Suppression of LH secretion in food-restricted lactating females: effects of ovariectomy and bromocryptine treatment.
MedLine Citation:
PMID:  7561627     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
It has been shown that restricting food in lactating rats for the first 2 weeks postpartum at a level of 60% of the ad-libitum daily ration increases the length of lactational dioestrus by about 7 days but little is known about correlated changes in hormone levels. In the first experiment we report changes in LH, prolactin (PRL) and ACTH secretion in food-restricted and ad-libitum fed lactating rats at various stages of lactation. Our results demonstrate that food restriction during the first 2 weeks of lactation did not affect PRL or ACTH secretion, but decreased plasma LH levels despite comparable GnRH receptor density between food-restricted and ad-libitum fed females. In the second experiments we investigated a possible causal relationship between the increased secretion of progesterone seen in food-restricted females and the suppression of plasma LH levels, by determining the effects of bromocryptine treatment and ovariectomy on LH secretion in both ad-libitum fed and food-restricted lactating females. LH suppression in food-restricted lactating females was not affected by ovariectomy or bromocryptine treatment, although the latter treatment significantly increased GnRH receptor number. These data suggest that factors other than ovarian steroids, PRL or increased adrenocortical activity modulate LH secretion and the length of lactational dioestrus in food-restricted lactating females.
Authors:
C D Walker; J B Mitchell; B C Woodside
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of endocrinology     Volume:  146     ISSN:  0022-0795     ISO Abbreviation:  J. Endocrinol.     Publication Date:  1995 Jul 
Date Detail:
Created Date:  1995-10-25     Completed Date:  1995-10-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0375363     Medline TA:  J Endocrinol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  95-104     Citation Subset:  IM    
Affiliation:
Department of Psychiatry, McGill University, Montreal, Quebec, Canada.
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MeSH Terms
Descriptor/Qualifier:
Adrenocorticotropic Hormone / secretion
Animals
Bromocriptine / pharmacology*
Diestrus / physiology
Female
Food Deprivation / physiology*
Lactation / physiology*
Luteinizing Hormone / secretion*
Ovariectomy*
Pituitary Gland / metabolism
Progesterone / secretion
Prolactin / secretion
Rats
Rats, Wistar
Receptors, LHRH / metabolism
Chemical
Reg. No./Substance:
0/Receptors, LHRH; 25614-03-3/Bromocriptine; 57-83-0/Progesterone; 9002-60-2/Adrenocorticotropic Hormone; 9002-62-4/Prolactin; 9002-67-9/Luteinizing Hormone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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