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去甲肾上腺素刺激高原鼠兔CRF的分泌

杜继曾 吴 雁 尤治秉   

  1. 中国科学院西北高原生物研究所
  • 出版日期:2006-04-07 发布日期:2008-07-07

NOREP INEPHRINE STIM ULATES THE RELEASE OF CORTICOTROPIN-REALEASING FACTOR FROM MEDIAN EMINENCE OF OCHOTONA CURZONIAE

DU Jizeng WU Yan YOU Zhibing   

  • Online:2006-04-07 Published:2008-07-07

摘要: 用脑室注射神经递质去甲肾上腺素(NE) RIA 法测定下丘脑正中隆起处促肾上腺皮质激素释放激素(CRF) 水平, 研究NE 对高原鼠兔下丘脑CRF分泌的作用。脑室给予不同剂量NE 3.75, 7.5, 15,30 ug/100 g BW. 正中隆起(ME) CRF 含量分别增加到对照组的106.05% , 135.28% (P < 0.05) ,138.94% (P < 0.01) , 103.65% , 同时, 血浆皮质酮浓度也分别增加到对照组的323.35% (P < 0.01) ,323.35% (P < 0.001) , 346.71% , 366.47%。肾上腺切除后2天和6天时, 下丘脑NE 下降到对照的76.32% (P < 0.05) , 76.27% (P < 0.01) , 血浆皮质酮也下降到16.57% (P < 0.01) , 2.05% (P <0.001)。上述结果表明, NE 刺激高原鼠兔下丘脑CRF 的分泌并激活下丘脑垂体肾上腺皮质轴。肾上腺皮质激素对维持下丘脑NE水平和CRF 神经元活动有一定的紧张作用。

关键词: 高原鼠兔, 促肾上腺皮质激素释放激素, 去甲肾上腺素

Abstract: We studied the effect of neurotransmitter norepinephrine (NE) on immunoreactive corticotropin-releasing factor (CRF) ofmedian eminence (ME) in the native pika (Ochotona curzoniae). At one hour after intracerebroventricular ( icv) administration of NE in doses of 3.75,7.5, 15 and 30 ug/100 g BW , the CRF level of ME increased. A nd the plasma corticosterone concentration also increased. Two and six days after adrenalectomy (ADX) , NE concentration in hypothalamus declined to 76.32% and 76.27% of those in intact pika, plasma corticorsterone concentration also decreased to 16.57 and 2.05% of the control. These results indicated that NE have a effect on activating HPA axis through activating hypothalamic CRF in Ochotona curzoniae.

Key words: Ochotona curzoniae, Corticotropin-releasing factor, Norepinephrine