大鼠肝细胞泌乳素受体的研究

Studies on the prolactin receptors on the membrane of rat liver cells

本文以^(125)I-oPRL为放射催标记配体,利用受体放射分析法,对哺乳期大鼠肝细胞泌乳素受体进行了研究。结果表明。大鼠肝细胞泌乳素受体与泌乳素的结合具有高度特异性和可饱和性,而且受反应时间和pH值大小的影响;这种结合并非简单的双分子反应,大鼠肝细胞泌乳素受体很可能存在两种亲和力高低不同的结合位点(Kd_1=3.20×10^(10)M,Kd_2=1.26×10^(-8)M)或负协同调节。本研究为将来深入开展泌乳素对肝脏机能调节机制的探讨打下了基础。

Binding sites or receptors for prolactin were identified in crude membrane fractions prepared from female lactating Sprague-Dawley rat using receptor radioassay. The results further indicated that the membrane of rat liver cells are rich in prolactin receptors, and the Scatchard analysis of the binding of ^(125)I-oPRL to receptors revealed that female rat liver cells contained two classes of prolactin receptors (Kd_1=3.20×10^(-10) M, Kd_2=1.26×10^(-8)M) with high specificity.