Document Detail


Testosterone and 11-ketotestosterone have different regulatory effects on electric communication signals of male Brachyhypopomus gauderio.
MedLine Citation:
PMID:  21596047     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The communication signals of electric fish can be dynamic, varying between the sexes on a circadian rhythm and in response to social and environmental cues. In the gymnotiform fish Brachyhypopomus gauderio waveform shape of the electric organ discharge (EOD) is regulated by steroid and peptide hormones. Furthermore, EOD amplitude and duration change on different timescales and in response to different social stimuli, suggesting that they are regulated by different mechanisms. Little is known about how androgen and peptide hormone systems interact to regulate signal waveform. We investigated the relationship between the androgens testosterone (T) and 11-ketotestosterone (11-KT), the melanocortin peptide hormone α-MSH, and their roles in regulating EOD waveform of male B. gauderio. Males were implanted with androgen (T, 11-KT, or blank), and injected with α-MSH before and at the peak of androgen effect. We compared the effects of androgen implants and social interactions by giving males a size-matched male stimulus with which they could interact electrically. Social stimuli and both androgens increased EOD duration, but only social stimuli and 11-KT elevated amplitude. However, no androgen enhanced EOD amplitude to the extent of a social stimulus, suggesting that a yet unidentified hormonal pathway regulates this signal parameter. Additionally, both androgens increased response of EOD duration to α-MSH, but only 11-KT increased response of EOD amplitude to α-MSH. Social stimuli had no effect on EOD response to α-MSH. The finding that EOD amplitude is preferentially regulated by 11-KT in B. gauderio may provide the basis for independent control of amplitude and duration.
Authors:
Anna Goldina; Sat Gavassa; Philip K Stoddard
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2011-05-08
Journal Detail:
Title:  Hormones and behavior     Volume:  60     ISSN:  1095-6867     ISO Abbreviation:  Horm Behav     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-06-29     Completed Date:  2011-10-28     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  0217764     Medline TA:  Horm Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  139-47     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Inc. All rights reserved.
Affiliation:
Department of Biological Sciences, Florida International University, Miami, FL 33199, USA. agoldi01@fiu.edu
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MeSH Terms
Descriptor/Qualifier:
Androgens / pharmacology*
Animal Communication*
Animals
Behavior, Animal / drug effects,  physiology
Electric Organ / drug effects*,  physiology
Gymnotiformes / physiology*
Male
Testosterone / analogs & derivatives*,  pharmacology*
alpha-MSH / pharmacology*
Grant Support
ID/Acronym/Agency:
MBRS GM08205/GM/NIGMS NIH HHS; R25 GM061347/GM/NIGMS NIH HHS; R25 GM061347-01/GM/NIGMS NIH HHS; R25 GM061347-02/GM/NIGMS NIH HHS; S06 GM008205/GM/NIGMS NIH HHS; S06 GM008205-14/GM/NIGMS NIH HHS
Chemical
Reg. No./Substance:
0/Androgens; 53187-98-7/11-ketotestosterone; 58-22-0/Testosterone; 581-05-5/alpha-MSH
Comments/Corrections

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


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