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Interactions of the mGluR5 gene with breeding and maternal factors on startle and prepulse inhibition in mice

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Abstract

Sensorimotor gating, measured by prepulse inhibition (PPI), is a fundamental form of information processing that is deficient in schizophrenia patients and mice lacking the gene for metabotropic glutamate receptor 5 (mGluR5). Both breeding strategies and mothering behaviors are capable of influencing the behavioral phenotype of knockout (KO) mice. Previous studies found a PPI deficit and increased startle magnitudes in mGluR5 KO mice derived from homozygous matings. Here we compared the PPI of mGluR5 wildtype (WT) and KO mice derived from heterozygous matings to that seen in mice derived from homozygous matings. Possible influences of postnatal mothering behaviors were examined using two different methods of cross-fostering. The potential developmental nature of the PPI deficit of the mGluR5 KO mice was also addressed via acute administration of the mGluR5 antagonist 2-methyl-6-(phenylethynyl)-pyridine (MPEP)to C57BL/6J mice. The mGluR5 KO mice exhibited reduced PPI independently of breeding strategy or postnatal mothering behavior. Startle magnitude, however, varied with breeding strategy. The PPI deficit seen in the mGluR5 KO mice is not mimicked by acute administration of an mGluR5 antagonist, and is therefore most likely due to compensatory alterations in neuronal circuitry occurring during development independent of maternal behaviors in the postnatal environment.

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  1. Departments of Psychiatry and Neurosciences, University of California San Diego, 9500 Gilman Drive, 92093-0804, La Jolla, CA, USA

    Suzanne A. Brody & Mark A. Geyer

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Brody, S.A., Geyer, M.A. Interactions of the mGluR5 gene with breeding and maternal factors on startle and prepulse inhibition in mice. neurotox res 6, 79–90 (2004). https://doi.org/10.1007/BF03033300

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