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The effects of pentylenetetrazol, chlordiazepoxide and caffeine in rats tested in the elevated plus-maze depend on the experimental illumination.
MedLine Citation:
PMID:  20933019     Owner:  NLM     Status:  In-Process    
The so-called anxiolytic and anxiogenic drugs are considered to cause, respectively, increases and decreases in plus-maze open arm exploration, without modifying locomotor activity occurring in the closed arms in an elevated plus-maze when the animals are tested in an illuminated environment. Simply testing animals in the dark also increases open arm exploration, which may be interpreted as an anxiolytic effect. We investigated the effects of two GABAergic drugs, pentylenetetrazol (10 and 20 mg/kg) and chlordiazepoxide (1.5 and 3 mg/kg), and one non-GABAergic drug, caffeine (10 and 30 mg/kg) on anxiety levels of rats tested in the elevated plus-maze under two illumination conditions, light or dark. All animals explored more the open arms in the dark. In the light, pentylenetetrazol decreased open arm exploration while chlordiazepoxide had the opposite effect. Neither pentylenetetrazol nor chlordiazepoxide had any effect in the dark. Caffeine, increased open arms exploration in both illumination conditions. These results indicate that light triggers aversion, a response mediated by GABA since the GABAergic drugs, but not caffeine, were ineffective when the rats were tested in the dark.
Andrea Milena Becerra Garcia; Fernando P Cardenas; Silvio Morato
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-10-07
Journal Detail:
Title:  Behavioural brain research     Volume:  217     ISSN:  1872-7549     ISO Abbreviation:  Behav. Brain Res.     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2010-12-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8004872     Medline TA:  Behav Brain Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  171-7     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier B.V. All rights reserved.
Facultad de Psicología, Universidad de La Sabana, Chía, Colombia.
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