Document Detail

Number of preoptic GnRH-immunoreactive cells correlates with sexual phase in a protandrously hermaphroditic fish, the dusky anemonefish (Amphiprion melanopus).
MedLine Citation:
PMID:  9373955     Owner:  NLM     Status:  MEDLINE    
The populations of gonadotropin-releasing hormone (GnRH)-producing cells within the preoptic area (POA) and terminal nerve (TN) of the brain have been suggested as the neuronal systems mediating social control of sex and gonadogenesis in sequentially hermaphroditic teleosts. In the present study, the number and soma size of GnRH-immunoreactive (GnRH-ir) cells in the POA and TN were studied in male, female and juvenile individuals of the dusky anemonefish (Amphiprion melanopus), a species which displays both male to female sex change and socially controlled sexual maturation. The results showed that the number of POA (but not TN) GnRH-ir cells differ significantly between sexual phases, with males displaying higher cell numbers than both females and juveniles. Soma sizes of POA and TN GnRH-ir cells were larger in females than in males and juveniles. However, this relationship was fully explained by differences in body size. The results indicate that high POA GnRH cell numbers are part of a masculinizing mechanism and support the hypothesis that the POA GnRH cell population plays a central role in initiating or mediating the process of socially induced gonadal and/or behavioural transformations in sequential hermaphrodites.
U Elofsson; S Winberg; R C Francis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of comparative physiology. A, Sensory, neural, and behavioral physiology     Volume:  181     ISSN:  -     ISO Abbreviation:  J. Comp. Physiol. A     Publication Date:  1997 Nov 
Date Detail:
Created Date:  1998-01-07     Completed Date:  1998-01-07     Revised Date:  2014-07-21    
Medline Journal Info:
Nlm Unique ID:  8413199     Medline TA:  J Comp Physiol A     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  484-92     Citation Subset:  IM    
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MeSH Terms
Cell Count
Cell Size / physiology
Fishes / physiology*
Gonadotropin-Releasing Hormone / physiology*
Hermaphroditic Organisms
Preoptic Area / cytology*,  physiology*
Sex Determination Processes / physiopathology
Sexual Maturation / physiology*
Reg. No./Substance:
33515-09-2/Gonadotropin-Releasing Hormone

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

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