对氯苯丙氨酸对大鼠海马胞液皮质酮受体数量的影响

本实验以(~3H)皮质酮为配体,建立了去肾上腺大鼠海马胞液皮质酮受体的放射配体结合测定法,并对海马胞液皮质酮受体的结合特性以及对氯苯丙氨酸(pCPA)对皮质酮受体数量的影响进行了研究。测得的皮质酮受体具有可饱和性、有限的结合能力、高亲和力和高特异性的特征。Scatchard分析为一直线,表明测得的皮质酮受体是一个或一组kd值十分接近的受体。侧脑室注射pCPA 1mg4天后,海马5-HT含量明显降低,同时海马胞液皮质酮受体的最大结合客量(Bmax)显著升高,提示海马5-HT能神经元的功能性活动在控制海马胞液皮质酮受体数量的相对恒定中具有重要作用。

Effects of Para-chlorophenylalanine on Corticosterone Receptor Binding Capacity of Hippocampal Cytosol in Adrenalectomized Rats

The properties of the corticosterone receptors and the effects of para-chlorophenylalanine(pCPA) on the binding capacity of the corticosterone receptors of the hippocampal cytosol in adrenalectomized rats were investigated with receptor radioligand binding assay(RLA) using (3H)-corticosterone as the ligand. It was fonud that the corticosterone receptors possessed the properties of satu-rability, limited binding capacity, high affinity and high specificity. RLA demonstrated a linear Scatchard plot, which implies that there is only one receptor or one group of receptors with similar Kd values. Four days after intracerebroven-tricular injection of 1 mg of pCPA, the hippocampal concentration of 5-HT was markedly decreased, and the binding capacity of the cytosol receptors was increased, which implies that the functional activity of the serotoninergic system in the hippocampus is an important factor in the control of the number of corticosterone receptors in rats.