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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Compulsive behavior in the 5-HT2C receptor knockout mouse.

The efficacy of serotonergic pharmacotherapy indicates that serotonin (5-HT) plays a role in the treatment, if not the etiology, of obsessive-compulsive disorder (OCD). While some clinical evidence implicates 5-HT(2C) receptors in this disorder, a definitive function has yet to be validated. We hypothesized that 5-HT(2C) receptor knockout (KO) mice may display compulsive-like behavior. This paper describes characterization of several distinct, highly organized behaviors in mice lacking functional 5-HT(2C) receptors, which supports a compulsive-like syndrome.Compulsive-like behavior was assessed in male 5-HT(2C) receptor KO and wildtype (WT) mice. Chewing of non-nutritive clay, chewing patterns on plastic-mesh screens, and the frequency of head dipping were measured. 5-HT(2C) receptor KO mice chewed more clay, produced a distinct pattern of "neat" chewing of plastic screens and exhibited reduced habituation of head dipping activity compared to WT mice. We conclude that the 5-HT(2C) receptor null mutant mouse provides a promising model of compulsive behavior and a means to further explore the role of 5-HT in OCD.[1]


  1. Compulsive behavior in the 5-HT2C receptor knockout mouse. Chou-Green, J.M., Holscher, T.D., Dallman, M.F., Akana, S.F. Physiol. Behav. (2003) [Pubmed]
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