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Yamada, K. et al.

Yamada, Ohki-Hamazaki, Wada,

Differential effects of social isolation upon body weight, food consumption, and responsiveness to novel and social environment in bombesin receptor subtype-3 (BRS-3) deficient mice.

The effects of social isolation on body weight gain, food consumption, and responsiveness to novel and social environment were assessed in an animal model for obesity, bombesin receptor subtype-3 (BRS-3) deficient mice. In Experiment 1, body weight gain and food consumption of group- and isolation-housed wild-type and BRS-3-deficient mice were compared. In wild-type mice, group-housed animals showed greater mean body weight gain and food consumption than did the isolation-housed cohort in the early stage of the experiment, whereas in BRS-3-deficient mice, the isolation-housed mice showed greater body weight gain and food consumption than the group-housed cohort by prolonged isolation housing. In Experiment 2, isolation-housed wild-type mice exhibited increased stereotypic and vertical movements relative to group-housed subjects in a novel environment, but this effect was not observed in BRS-3-deficient mice. In Experiment 3, when social response was assessed in animals housed in isolation, BRS-3-deficient mice exhibited lower social responses than did wild-type mice. We conclude that BRS-3-deficient mice and wild-type mice are differentially affected by social isolation. These results suggest that BRS-3 expression in the CNS may affect the neural mechanisms that regulate isolation effects in wild-type animals.[1]

References

Differential effects of social isolation upon body weight, food consumption, and responsiveness to novel and social environment in bombesin receptor subtype-3 (BRS-3) deficient mice. Yamada, K., Ohki-Hamazaki, H., Wada, K. Physiol. Behav. (2000) [Pubmed]

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