Behavioral characterization of dysbindin-1 deficient sandy mice.

Abstract:

:Dysbindin-1 (dystrobrevin binding protein-1) has been reported as a candidate gene associated with schizophrenia. Dysbindin-1 mRNA and protein levels are significantly reduced in the prefrontal cortex and hippocampus of schizophrenia subjects. To understand the in-vivo functions of dysbindin-1, we studied schizophrenia relevant behaviors in adult male Sandy homozygous (sdy/sdy) and heterozygous (sdy/+) mice that have a natural mutation in dysbindin-1 gene (on a DBA/2J background) resulting in loss of protein expression. Spontaneous locomotor activity of sdy/sdy and sdy/+ mice in novel environment was not significantly different from DBA/2J controls. However, on repeated testing in the same environment for 7 days, sdy/sdy mice, in contrast to DBA/2J controls showed a lack of locomotor habituation. Locomotor activating effect of a low dose of d-amphetamine (2.5 mg/kg i.p.), a behavioral measure of mesolimbic dopamine activity, was significantly reduced in the mutant mice. Interestingly, sdy/sdy mice showed enhanced locomotor sensitization to repeated five daily injection of amphetamine. Possible cognitive impairment in Sandy mutants was revealed in novel object recognition test as sdy/sdy and sdy/+ mice spent significantly less time exploring novel objects compared to DBA/2J. Sdy/sdy mice also showed deficits in emotionally motivated learning and memory showing greater freezing response to auditory conditioned stimulus (CS) in fear conditioning paradigm. In thermal nociceptive test, the latency of paw withdrawal in sdy/sdy and sdy/+ animals was significantly higher compared to DBA/2J indicating hypoalgesia in the mutants. Taken together, these data suggest that dysbindin-1 gene deficiency leads to significant changes in cognition and altered responses to psychostimulants.

journal_name

Behav Brain Res

authors

Bhardwaj SK,Baharnoori M,Sharif-Askari B,Kamath A,Williams S,Srivastava LK

doi

10.1016/j.bbr.2008.10.011

subject

Has Abstract

pub_date

2009-02-11 00:00:00

pages

435-41

issue

2

eissn

0166-4328

issn

1872-7549

pii

S0166-4328(08)00557-3

journal_volume

197

pub_type

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