Dopaminergic Hyperactivity Accompanied by Hyperlocomotion in C57BL/6J-bg[J]/bg[J] (beige-J) Mice

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  • Mori Tomohisa
    Department of Toxicology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Japan
  • Funada Masahiko
    Department of Toxicology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Japan
  • Tsuda Yuko
    Department of Toxicology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Japan
  • Maeda Jun
    Department of Toxicology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Japan
  • Uchida Masashi
    Department of Toxicology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Japan
  • Suzuki Tsutomu
    Department of Toxicology, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Japan

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  • Dopaminergic Hyperactivity Accompanied by Hyperlocomotion in C57BL/6J-bg<sup>J</sup>/bg<sup>J</sup> (beige-J) Mice

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Genetic factors affect locomotor activity, which mainly depends on the activation of dopaminergic systems. C57BL/6J-bgJbgJ (beige-J) mice, which exhibit deficiencies in immunological function, show behavioral hyperactivity. The present study was designed to investigate the locomotor activity of beige-J mice accompanied by a change in the dopaminergic system. Beige-J mice showed higher locomotor activity and dopamine turnover, whereas splenectomy reduced this hyperlocomotion and dopamine turnover. These results suggest that beige-J mice could be suitable as an experimental animal model for investigating hyperactivation of the dopaminergic system, and the spleen may contribute to the susceptibility of dopaminergic systems to activation.

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