Document Detail

Distribution of chicken-II gonadotropin-releasing hormone in mammalian brain.
MedLine Citation:
PMID:  7673483     Owner:  NLM     Status:  MEDLINE    
Brains of nonmammalian vertebrates typically contain multiple forms of gonadotropin-releasing hormone (GnRH). Until recently, only the mammalian form of GnRH (mGnRH) had been isolated in placental mammals. Biochemical and histological data show that both mGnRH and chicken-II GnRH (cGnRH-II) are present in a primitive placental mammal, the musk shrew (Suncus murinus). Similar to the case in nonmammalian species, in the musk shrew, neurons that express cGnRH-II are located in a discrete cluster in the midbrain. We have used a combination of radioimmunoassay and immunocytochemistry, analyzed at the light level and with electron microscopy, to describe the distribution of cGnRH-II cell bodies and fibers in the musk shrew brain. All cGnRH-II-immunoreactive (ir) neurons reside in the midbrain, and this area contains the greatest concentration of cGnRH-II peptide in the brain. At the light and electron micrographic levels, we have identified synaptic terminals containing dense core vesicles that are immunoreactive for cGnRH-II in the medial habenula. Radioimmunoassay reveals that this region contains the second greatest concentration of cGnRH-II in the brain. Widely scattered cGnRH-II-ir fibers are present throughout the forebrain, particularly in the medial septum, hypothalamus, and midbrain central gray. Scant cGnRH-II fibers are present in the median eminence, arcuate nucleus, and infundibular stem, and only low concentrations of the peptide are detected in these areas. Finally, intravenous administration of mGnRH is ten times more effective than cGnRH-II in promoting ovulation.(ABSTRACT TRUNCATED AT 250 WORDS)
E F Rissman; V E Alones; C B Craig-Veit; J R Millam
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Journal of comparative neurology     Volume:  357     ISSN:  0021-9967     ISO Abbreviation:  J. Comp. Neurol.     Publication Date:  1995 Jul 
Date Detail:
Created Date:  1995-10-19     Completed Date:  1995-10-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0406041     Medline TA:  J Comp Neurol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  524-31     Citation Subset:  IM    
Department of Biology, University of Virginia, Charlottesville 22903, USA.
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MeSH Terms
Arvicolinae / metabolism*
Brain Chemistry / physiology*
Gonadotropin-Releasing Hormone / analysis*
Nerve Fibers / chemistry*
Neural Pathways / chemistry
Ovulation / physiology
Presynaptic Terminals / chemistry
Reg. No./Substance:
33515-09-2/Gonadotropin-Releasing Hormone

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