Document Detail

Comparison of arginine vasotocin immunoreactivity differences in dominant and subordinate green anole lizards.
MedLine Citation:
PMID:  18835286     Owner:  NLM     Status:  MEDLINE    
The neuropeptide arginine vasotocin (AVT) and its mammalian homologue arginine vasopressin (AVP) are believed to be involved in many social behaviors including territorial aggression. Testosterone (T) is also important for controlling territorial aggression, and it is believed to be involved in modulating AVT/AVP levels in the brain. In this study, male Anolis carolinensis were paired (n=11 pairs) in a neutral cage and were allowed to establish a dominant-subordinate relationship for 10 days (experimental groups) or housed in a neutral cage with or without a female (control groups; each n=4). On 10th day animals were sacrificed and their brain sections were processed for AVT immunohistochemistry and their serum was analyzed for testosterone levels. AVT immunoreactive (AVT-ir) cell numbers were counted in the anterior hypothalamus (AH), paraventricular nucleus (PN), posterior hypothalamus (PH), preoptic area (POA), and supra optic nuclei (SON). 2-way randomized block design was conducted to assess AVT-ir cell number differences between dominant and subordinate animals and Pearson's correlations were used to determine if a relationship existed between T levels and AVT-ir cell numbers. Dominant animals had more AVT-ir cells in the POA compared to subordinate animals, and subordinate animals had fewer AVT-ir cells in the POA compared to males housed either singly or with a female. There were no differences in AVT-ir cell numbers between dominant and subordinate animals in other areas. T levels were not correlated with the AVT-ir cell numbers in any area. Thus dominant animals have increased AVT-ir cell numbers compared to subordinate animals in a brain region known to be important in male sexual behavior. However, this difference is not related to differences in T.
Tomoko Hattori; Walter Wilczynski
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2008-09-16
Journal Detail:
Title:  Physiology & behavior     Volume:  96     ISSN:  0031-9384     ISO Abbreviation:  Physiol. Behav.     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2008-12-23     Completed Date:  2009-04-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0151504     Medline TA:  Physiol Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  104-7     Citation Subset:  IM    
Institute for Neuroscience, The University of Texas at Austin, Austin, TX 78712-0187, USA.
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MeSH Terms
Cell Count
Hypothalamus / cytology,  metabolism*
Lizards / anatomy & histology,  metabolism*
Statistics as Topic
Testosterone / metabolism
Vasotocin / metabolism*
Reg. No./Substance:
58-22-0/Testosterone; 9034-50-8/Vasotocin

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

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