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大鼠主动脉a_1肾上腺素受体3种亚型的mRNA水平 被引量:1

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摘要 α_1肾上腺素受体(α_1-AR)是介导血管平滑肌收缩的主要受体,它在调节血压、血管阻力及器官血流量中发挥十分重要的作用.根据大鼠大脑皮层、海马、输精管及脾脏等组织对WB4101,5MU及(+)Niguldipine等α_1-AR 拮抗剂的亲和性和对氯乙基可乐啶(CEC)的敏感性,α_1-AR曾被分成α_(1A)及α_(1B)2种亚型.随后通过大量的药理学和分子生物学研究,现已发现α_1-AR含有3种亚型.它们分别为α_(1A),α_(1B)和α_(1D).并发现α_(1D)-AR的某些药理特性与α_(1A)-AR和α_(1B)-AR相似,并和α_(1B)-AR一样,可被CEC不可逆阻断.最近,Saussy等根据α_(1D)-AR的药理特性,首先提出去甲肾上腺素引起的大鼠主动脉的收缩是由α_(1D)受体亚型所介导的.但该研究仅在功能上显示了大鼠主动脉的α_i-AR亚型.由于血管组织与拮抗剂结合的高非特异性和缺乏区分α_(1)-AR 3种亚型的拮抗剂,很难采用放射配基结合实验来研究大鼠主动脉中α_1-AR 3种亚型的蛋白质水平的分布.Testa等曾经报道大鼠主动脉膜制品与CEC孵育后与α_1-AR拮抗剂哌唑嗪的结合位点下降88%.但这一结果并未回答α_(1D)与α_(1B)之间的比例.因此,大鼠主动脉中α_1-AR 3种亚型的分布比例尚未清楚.本文采用定量液相杂交方法测定α_1-AR 3种亚型的mRNA含量,试图从mRNA水平?
出处 《科学通报》 EI CAS CSCD 北大核心 1997年第10期1110-1112,共3页 Chinese Science Bulletin
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