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脳下垂体摘出がストレス耐性に与える効果 : シリアンハムスターの精巣・体重発達を指標として

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(1)Shiga University. ŽC‘’“j 45” No. ῑῒ, pp. ΐΐ ῍ ῔ῑ, ῏῍῍ῒ. ῌῌ.  

(2)  ῌῌ  !"#$%&' ῌῌ ( ) *+,- . / 0. The Effect of Hypophysectomy on Stress Tolerance in the Syrian Hamster using the Indicators of Body Weight and Testes Weight Akiko MURANAKA and Nobuo IBUKA. Abstract The present experiment was performed to clarify the effect of hypophysectomy on stress tolerance in the Syrian hamster using indicators of body weight and testes weight. Stress was produced by unpredictable deprivation of food on ῐ῍1 of the days during the. ῒ ῍week long photoperiods.. We hypothesized that hypophysectomy attenuate stress toler-. ance, and thus prevent the growth of body weight and testes weight compared to the sham῍operated animals.. The present findings clearly showed that the body weight gain. was more suppressed in the hypophysectomized animals than that in the sham operated ones. Our results also clearly indicated that the testicular weight/ ῎῍῍ g B῕ W in the hypophysectomized animals was more suppressed than that in the sham῍operated ones and thus, the suppression ratio 2SR3 in the hypophysectomized animals was much higher than that in the sham῍operated ones.. The working hypothesis that stress tolerance will be attenua-. ted by hypophysectomy was confirmed in the long photoperiods from the present findings. Key words : Stress, Syrian hamster, Hypophysectomy, Long photoperiod, Testicular weight, Body weight. EaWZῌ<=>?A9 45 HI'A9 ῎ ῌ ῏ ῍. FG %b'CDEcd%Ee9 fBg" hiMPjk%EQ %]l9 ῌ<=>. 456789 :;9 ῌ<=>?@AB. ? mJ<

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(101) /0DEF›+  OPQRSTUV. $%+ij9ef ¤¥fŸ &'¦ž§¨Ÿ Ÿ  ῍ . Leshner, A I.  An Itroduction to Behavioral Endocrinology. Oxford University Press, New York. ©ª «  OPQRSTUV s 1 ¬­ ῌῌ MN 23®Ÿ ¯Ÿ ῍D° ῌ ῌῌŸ ±²^ž³´ž§¨ µ ¶·45 67£ Mizumura, H., and Ibuka, N.   Living in the enriched environment alleviates stress under decreasing photoperiods in Syrian hamsters. Memoirs of the Faculty of Education, Shiga University, ,  ῍. BC¸8DEF›+  ¹῍˜°   ῌ%Y3JKMN|. NII-Electronic Library Service.

(102) Shiga University.  !"#$.   

(103)    ῌ . Nelson, R J., Demas, G E., Klein, S L., and Kriegsfeld, L J.  Seasonal patterns of stress, immune functions, and disease. Cambridge University Press, Cambridge UK. Ruby, N F., Ibuka, N., Barnes, B M., and Zucker, I.  Suprachiasmatic nuclei influence torpor and circadian temperature rhythms in hamsters. American Journal of Physiology,  , R  ῌR ..

(104). Schulkin, J.  The Neuroendocrine Regulation of Behavior. Cambridge University Press, Cambridge, UK. Terada, A., and Ibuka, N.  Age affects hibernation in Syrian hamsters Mesocricetus auratus Chronobiology International,  ,  ῌ  . Ueda, S., and Ibuka, N.  An analysis of factors that induce hibernation in Syrian Hamsters. Physiology and Behavior, ,  ῌ  .. NII-Electronic Library Service.

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