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Delayed stress-induced differences in locomotor and depression-related behaviour in female neuropeptide-Y Y1 receptor knockout mice

Abstract

Neuropeptide-Y acting through Y1 receptors reduces anxiety and stress sensitivity in rodents. In Y1 receptor knockout (Y1/) mice, however, anxiety-related behaviour is altered only in a context-dependent manner. Here, we investigated whether stress causes a delayed change in the emotional-affective behaviour of female Y1/ mice. Locomotor and anxiety-related behaviour was assessed with the elevated plus-maze (EPM) test and depression-like behaviour with the forced swim test (FST). These behavioural tests were also used as experimental stress paradigms. Locomotion and anxiety-like behaviour did not differ between naive control and Y1/ mice. One week after the FST, locomotion was reduced in control animals but unchanged in Y1/ mice, whereas anxiety-like behaviour remained unaltered in both genotypes. Depression-like behaviour (immobility) was identical in naive control and Y1/ mice but, 1 week after the EPM test, was attenuated in Y1/ mice relative to control animals. Our data show that naive female Y1/ mice do not grossly differ from female control animals in their locomotor and depression-like behaviour. Exposure to the stress associated with behavioural testing, however, leads to delayed genotype-dependent differences in locomotion and depression-like behaviour. These findings attest to a role of Y1 receptor signalling in the control of stress coping and/or adaptation.

Type Journal
ISBN 1461-7285 (Electronic) 0269-8811 (Linking)
Authors Painsipp, E.; Sperk, G.; Herzog, H.; Holzer, P.;
Garvan Authors Prof Herbert Herzog
Publisher Name J PSYCHOPHARMACOL
Published Date 2010-01-01 00:00:00
Published Volume 24
Published Issue 10
Published Pages 1541-9
URL http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=19351805
Status Published In-print