Document Detail

Co-localization and distribution of corticotrophin-releasing hormone, arginine vasopressin and enkephalin in the paraventricular nucleus of sheep: a sex comparison.
MedLine Citation:
PMID:  15837136     Owner:  NLM     Status:  MEDLINE    
The paraventricular nucleus (PVN) is integral to regulation of the hypothalamo-pituitary-adrenal (HPA) axis and contains cells producing corticotrophin-releasing hormone (CRH), arginine vasopressin (AVP) and enkephalin. We used immunohistochemistry to map these peptides and to resolve the extent of co-localization within PVN cells in intact and gonadectomized male and female sheep. Immunoreactive (ir) CRH, AVP and enkephalin cells were mapped in two rams and two ewes at 180 mum intervals throughout the rostro-caudal extent of the PVN. Similar distributions of AVP-ir cells occurred in both sexes whereas CRH-ir and enkephalin-ir cells extended more rostrally in rams. In groups (n=4) of intact and gonadectomized sheep of both sexes, co-localization and distribution of neuropeptides was influenced by sex and gonadectomy. Males had more AVP and CRH cells than females. Intact animals had more AVP cells than gonadectomized animals. There were no differences between groups in the number or percentage of cells that stained for both CRH and AVP or in the number of cells that stained for both CRH and enkephalin. Differences were observed in the percentage of enkephalin cells that contained CRH with males having a greater percentage of co-localized cells than did females. Differences were also observed in the number and percentage of cells that stained for both enkephalin and AVP; the number of cells that stained for both neuropeptides was greater in males than in females and greater in intact animals than in gonadectomized animals. Differences were observed in the percentage of AVP cells that contained enkephalin, and in the percentage of enkephalin cells that contained AVP with males having a greater percentage of co-localized cells than did females. We conclude that sex and gonadal status affect peptide distribution in the PVN of the sheep which may provide an anatomical basis for sex differences in HPA axis responses to stress.
E T A Rivalland; J Iqbal; I J Clarke; A I Turner; A J Tilbrook
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Neuroscience     Volume:  132     ISSN:  0306-4522     ISO Abbreviation:  Neuroscience     Publication Date:  2005  
Date Detail:
Created Date:  2005-04-19     Completed Date:  2005-08-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7605074     Medline TA:  Neuroscience     Country:  United States    
Other Details:
Languages:  eng     Pagination:  755-66     Citation Subset:  IM    
Department of Physiology, Monash University, Clayton, Victoria 3800, Australia.
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MeSH Terms
Arginine Vasopressin / metabolism*
Cell Count / methods
Corticotropin-Releasing Hormone / metabolism*
Enkephalins / metabolism*
Immunohistochemistry / methods
Neurons / metabolism*
Paraventricular Hypothalamic Nucleus / cytology*
Sex Characteristics*
Reg. No./Substance:
0/Enkephalins; 113-79-1/Arginine Vasopressin; 9015-71-8/Corticotropin-Releasing Hormone

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

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