Ultrasonic Vocalization Responses in Genetically High- and Low-Emotional Rats

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  • NAITO Hiroyuki
    Department of Neurophysiology, School of Veterinary Medicine, Azabu University
  • INOUE Maki
    Department of Neurophysiology, School of Veterinary Medicine, Azabu University
  • SUZUKI Yoshihiko
    Department of Biochemistry, School of Veterinary Medicine, Azabu University
  • TOHEI Atushi
    Laboratory of Veterinary Physiology, Tokyo University of Agriculture and Technology
  • WATANABE Gen
    Laboratory of Veterinary Physiology, Tokyo University of Agriculture and Technology
  • TAYA Kazuyoshi
    Laboratory of Veterinary Physiology, Tokyo University of Agriculture and Technology
  • MAKINO Junsiro
    The Institute of Psychology, University of Tsukuba

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Tsukuba High Emotional (THE) and Tsukuba Low Emotional (TLE) strains of rats have been congenitally bred for use in studies of emotionality. The current study investigated THE and TLE strain differences in the footshock-induced ultrasonic vocalization responses of adult male rats. Ultrasonic vocalization response inducibility (ratio of rats emitting ultrasounds) and vocalization activity in THE rats were statistically higher than in TLE rats. We next examined the causal relation between the ultrasonic vocalizations and the activation of the pituitary-adrenocortical axis in response to footshocks in these two strains of rats. Rats were sorted into two groups, vocalizing and non-vocalizing, after being exposed to the shock regimen daily for 5 successive days. Basal plasma concentrations of ACTH and corticosterone were not different between THE and TLE rats. After receiving footshocks, significant increases in plasma concentrations of ACTH and corticosterone were induced in both strains of rats. These increases in plasma concentrations of ACTH and corticosterone were significantly higher in THE than in TLE rats. However, in vocalizing and non-vocalizing rats of both strains, no statistical differences in plasma concentrations of ACTH and corticosterone were observed after footshocks. These findings suggest that the high emotionality of the adult male rats was reflected in the emission of ultrasounds, and that the emission of ultrasonic vocalizations might not be related to the activation of the pituitary-adrenocortical axis.<br>

収録刊行物

  • Experimental Animals

    Experimental Animals 50 (4), 285-291, 2001

    公益社団法人 日本実験動物学会

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