Ethopharmacological analysis of the open elevated plus-maze in mice.

Abstract:

:Exposure of rodents to an open elevated plus-maze (oEPM) elicits antinociception and increases plasma corticosterone levels. However, no studies have yet assessed the defensive behaviour repertoire of animals in this modified test. In Experiment 1, factor analysis was employed to characterise the behavioural profile of mice exposed to the oEPM. Experiments 2 and 3 assessed the effects of acute alprazolam (0.5-1.5mg/kg; diazepam 0.5-1.5mg/kg), pentylenetetrazole (10.0-30.0mg/kg), yohimbine (2.0-6.0mg/kg), mCPP (0.3-3.0mg/kg), and acute and chronic fluoxetine (10.0-30.0mg/kg) and imipramine (1.0-15.0mg/kg) on behaviours identified in Experiment 1. The factor analyses revealed that behaviour in the oEPM can largely (77% total variance) be accounted for in terms of 3 factors: factor 1 ('depth exploration'; e.g. head-dipping on the arms), factor 2 ('cautious exploration of arms'; e.g. flatback approach), and factor 3 ('risk assessment'; stretched attend postures - SAP). Experiments 2 and 3 showed that, over the dose range used, alprazolam selectively attenuated all measures of defensiveness. Similar, though more modest, effects were seen with diazepam. Confirming the intensity of the emotional response to the oEPM (nociceptive, endocrine and behavioural), relatively few significant behavioural changes were seen in response to the anxiogenic compounds tested. Although acute fluoxetine or imipramine treatment failed to modify behaviour in the oEPM, chronic fluoxetine (but not chronic imipramine) attenuated total flat back approach and increased head dipping outside the central square. Together, the results indicate that the oEPM induces behavioural defensive responses that are sensitive to alprazolam and chronic fluoxetine.

journal_name

Behav Brain Res

authors

Sorregotti T,Mendes-Gomes J,Rico JL,Rodgers RJ,Nunes-de-Souza RL

doi

10.1016/j.bbr.2013.02.035

subject

Has Abstract

pub_date

2013-06-01 00:00:00

pages

76-85

eissn

0166-4328

issn

1872-7549

pii

S0166-4328(13)00117-4

journal_volume

246

pub_type

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