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Effect of corticosterone and paroxetine on masculine mating behavior: possible involvement of neurogenesis.
MedLine Citation:
PMID:  20955318     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
INTRODUCTION: Corticosterone inhibits male rodent sexual behavior while the mechanism remains obscured. Recent studies have disclosed that neurogenesis in the subventricular zone (SVZ) can be increased by pheromone exposure from the opposite sex, and neurogenesis is essential for normal mating behavior of female mice. Together with the neurogenesis-inhibiting effect of corticosterone, we hypothesize that cell proliferation in the olfactory system is essential for male rodent sexual functioning.
AIM: The current study explored the relationship between cell proliferation in the olfactory system and male sexual behavior.
MAIN OUTCOME MEASURES: Sexual behavior performance, proliferative cell counts, and c-fos-expressing cell counts.
METHODS: Adult male rats were treated with corticosterone and/or paroxetine, an antidepressant, for 2 weeks. These two drugs were shown to suppress and enhance hippocampus and SVZ cell proliferation, respectively. Mating behavior was assessed after the treatment, and proliferation of new cells and c-fos-expressing cells, activated neurons in the mating-related regions in the brain, were analyzed. To further confirm the necessity of cell proliferation in mating, inhibition of cell proliferation was performed by intracerebroventricular infusion of cytostatic cytosine arabinose (Ara-c).
RESULTS: Corticosterone treatment, which inhibited cell proliferation in both the SVZ and olfactory epithelium, led to inhibited male sexual performance. In contrast, paroxetine increased cell proliferation and improved the performance in corticosterone-treated animals. When cell proliferation in the brain was inhibited by Ara-c, a suppressed sexual performance was found. However, cell proliferation in olfactory epithelium was not inhibited by Ara-c and thus the sexual inhibition is unlikely to be linked to this region. Furthermore, a decrease in c-fos expression in the mating-related regions upon female pheromone stimulation was found.
CONCLUSIONS: These results suggest that cell proliferation in the SVZ and hippocampus may be involved in the reproduction of the male rodents, and pharmacological treatments may affect sexual functioning through alteration of neurogenesis.
Authors:
Benson Wui-Man Lau; Suk-Yu Yau; Tatia M C Lee; Yick-Pang Ching; Siu-Wa Tang; Kwok-Fai So
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-10-18
Journal Detail:
Title:  The journal of sexual medicine     Volume:  8     ISSN:  1743-6109     ISO Abbreviation:  J Sex Med     Publication Date:  2011 May 
Date Detail:
Created Date:  2011-04-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101230693     Medline TA:  J Sex Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1390-403     Citation Subset:  IM    
Copyright Information:
© 2010 International Society for Sexual Medicine.
Affiliation:
Department of Anatomy, The University of Hong Kong, Pokfulam, Hong Kong SAR, China.
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