Document Detail


Whole Brain Monoamine Detection and Manipulation in a Stalk-eyed Fly.
MedLine Citation:
PMID:  23891953     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Understanding the physiological mechanisms that influence conflict resolution is of great importance because the outcome of contests over limited resources such as mates, territories, and food has significant fitness consequences. Male stalk-eyed flies (Teleopsis dalmanni) compete over territory and mates and provide an excellent model system to study aggression. To investigate potential effects of serotonin (5-HT) on aggressive behavior in these flies, we developed a dissection and sample preparation method sufficiently sensitive to measure monoamine concentrations from whole brain samples of small insects. This new method allows the detection of monoamines from a single fly brain using high performance liquid chromatography with electrochemical detection. The method allows for the detection and quantification of octopamine (OA), 5-hydroxytryptophan (5-HTP), dopamine (DA), 5-hydroxyindoleacetic acid (5-HIAA), tyramine (TA), and serotonin (5-HT) and provides a means for assessing changes in stalk-eyed fly brain monoamine concentrations in response to drug administration in food media. We successfully elevated 5-HT levels approximately eight fold that of control levels in stalk-eyed fly brains by oral administration of the 5-HT precursor 5-HTP. Furthermore, in size-matched competitions for a food resource, flies that had elevated 5-HT in response to 5-HTP pretreatment exhibited a high probability of winning the contests. These results suggest that 5-HT enhances aggression in the stalk-eyed fly and highlight the potential of our method for testing putative roles of monoamines in modulating self and rival assessment in conflict resolution.
Authors:
Andrew N Bubak; John G Swallow; Kenneth J Renner
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-7-24
Journal Detail:
Title:  Journal of neuroscience methods     Volume:  -     ISSN:  1872-678X     ISO Abbreviation:  J. Neurosci. Methods     Publication Date:  2013 Jul 
Date Detail:
Created Date:  2013-7-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7905558     Medline TA:  J Neurosci Methods     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013 Elsevier B.V. All rights reserved.
Affiliation:
Department of Biology, University of South Dakota, Vermillion, SD 57069, USA.
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