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高原鼠兔下丘脑促肾上腺皮质激素释放因子的放射免疫测定

杜继曾, 龙治秉   

  1. 中国科学院西北高原生物研究所,西宁
  • 出版日期:2006-07-28 发布日期:2007-07-20

A RADIOIMMUNOASSAY OF CORTIC0TROPIN RELEASING FACTOR OF HYPOTHALAMUS IN 0CH0TDNA CURZDNIAE

DU Jizeng, YOU Zhibing   

  • Online:2006-07-28 Published:2007-07-20

摘要: 高原鼠兔已被我们选定为研究高原低氧适应机制的模型动物。我们过去的研究从器官水平乃至细胞和亚细胞水平均已证明该动物对高原低氧是不敏感的,属于高原低氧完全适应型动物。在研究下丘脑神经肽对高原低氧神经内分泌系的调控作用时,我们用大鼠下丘脑促肾上腺皮质激素释放因子(Corticotropin releasing,factor,CRF)的抗原、抗体放射免疫方法测定高原鼠免下丘脑CRF水平,获得了满意的结果,其灵敏度范围为3—2O0微微克/管,批间和批内变异系数分别为2.69%和7.24%。高原鼠兔下丘脑正中隆起处(Median eminence,ME)的提取物等的稀释液显示出与台成的大鼠CRF及其抗体闻放射免疫反应的标准曲线,有很好的平行关系。高原鼠兔和大鼠ME处CRF的水平用此法测定分别为1 0.13±3.05和17.22±3.88微微克/毫克蛋白。大鼠ME处CRF水平随模拟海拔高度的增加而降低,而高原鼠兔不变化。随着肾上腺双侧切除,下丘脑ME之CRF下降,血浆皮质酮水平急剧下降,本结果提示,高原鼠兔的下丘脑确实含有与大鼠相类似结构与组成的CRF。此测定方法的确立,为研究高原鼠兔低氧神经内分泌适应机理,开拓了新路。

关键词: 放射免疫测定, 上腺皮质激素释放因子, 高原鼠兔, 低氧, 大鼠

Abstract: 0chotona curzoniae has been recommended byourpast work to be a model animforstudying mechanism of hypoxic adaptation.In studies of hypoxic modulation of CRF (Corticotropin Releasing Factor)we successfully teated the contents of CRF in median eminence hypothalamus using a rat CRF and its antiserum with a sensitivity range of 3 to 200 Pg/tube.Intra and inter assay aoefficient of variation were 2.35 % and2.24% respectively.The extract of median eminence of O.curzoniae showed a good parallel dose response curve with synthetic rat CRF.The mean levels Of CRF of median eminence . Curzoniaewere 17.22+ 3.88 and 10.13+3.05 pg/mg protein respectively. The levels were decreased with increases in altitude in rats but not in O.coezoniae.The results suggest that the hypothalamus of O.curzoniae containsa CRF similar o rat CRF.The developed radioimmunoasay of CRF would lead to a new prospect o study further the mechanisms of hypoxia adaptations in the neuroendcorine
and itsregulation in O.curzoniae.

Key words: Radioimm enoassay, CRF, Pika(0chatona curzen iae), Hypo xia, Rats