Journal
PSYCHOPHARMACOLOGY
Volume 195, Issue 4, Pages 547-557Publisher
SPRINGER
DOI: 10.1007/s00213-007-0945-2
Keywords
neuropeptide Y; Y1; receptor; knockout; mouse; fear; anxiety; depression; neurogenesis
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Funding
- NATIONAL INSTITUTE OF MENTAL HEALTH [Z01MH002784, Z01MH002179, ZIAMH002784, ZIAMH002179] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON ALCOHOL ABUSE AND ALCOHOLISM [Z01AA000411, ZIAAA000411] Funding Source: NIH RePORTER
- NIH HHS [NH02177, NH002784] Funding Source: Medline
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Rationale Neuropeptide Y (NPY) is implicated in the pathophysiology of affective illness. Multiple receptor subtypes (Y1R, Y2R, and Y5R) have been suggested to contribute to NPY's effects on rodent anxiety and depression-related behaviors. Objectives To further elucidate the role of Y1R in (1) NPY's anxiolytic-like effects and (2) fluoxetine's antidepressant-like and neurogenesis-inducing effects. Methods Mice lacking Y1R were assessed for spontaneous anxiety-like behavior (open field, elevated plus-maze, and light/dark exploration test) and Pavlovian fear conditioning, and for the anxiolytic-like effects of intracerebroventricularly (icv)-administrated NPY (elevated plus-maze). Next, Y1R -/- were assessed for the antidepressant-like effects of acute fluoxetine in the forced swim test and chronic fluoxetine in the novelty-induced hypophagia test, as well as for chronic fluoxetine-induced hippocampal neurogenesis. Results Y1R -/- exhibited largely normal baseline behavior as compared to +/+ littermate controls. Intraventricular administration of NPY in Y1R -/- mice failed to produce the normal anxiolytic-like effect in the elevated plus-maze test seen in +/+ mice. Y1R mutant mice showed higher immobility in the forced swim test and longer latencies in the novelty-induced hypophagia test. In addition, Y1R -/- mice responded normally to the acute and chronic effects of fluoxetine treatment in the forced swim test and the novelty-induced hypophagia test, respectively, as well as increased neuronal precursor cell proliferation in the hippocampus. Conclusions These data demonstrate that Y1R is necessary for the anxiolytic-like effects of icv NPY, but not for the antidepressant-like or neurogenesis-inducing effects of fluoxetine. The present study supports targeting Y1R as a novel therapeutic target for anxiety disorders.
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