新合成的阿片受体配基对稳定转染μ阿片受体的CHO细胞的受体结合特性

目的：研究新合成的阿片受体配基对稳定表达于CHO细胞的μ阿片受体的结合特性。方法：采用细胞生物学和放射性配基结合的方法,以能稳定表达μ阿片受体的CHO细胞为模型,检测阿片受体配基[^3H]diprenorphine(^3H-dip)与μ阿片受体的饱和性结合特征及一系列新合成阿片配基的竞争性结合特征。结果：(^3H-dip)结合μ阿片受体的平衡解离常数Kd值为1.06nmol/L;受体最大容量Bmax为930fmol/mg蛋白。竞争性结合实验表明3^#和12^#配基对μ阿片受体的亲和力高于BAMGO和吗啡。2^#、6^#、8^#和9^#配基对μ受体的亲和力低于BAMGO和吗啡。结论：新配基3^#和12^#对μ亚型的阿片受体有良好的亲和力。2^#、6^#、8^#和9^#配基对μ受体的亲和力较低。

Binding characteristics of new synthesized opioid receptor ligands to cloned mu opioid receptors stably expressed in CHO cell

OBJECTIVE: To determine the affinity of new opioid receptor ligands to cloned mu opioid receptors stably expressed in CHO cell. METHODS: The binding characteristics of the opioid ligand [3H] diprenorphine (3H-dip) were studied by cellular biological techniques and radioligands binding in cloned mu opioid receptors stably expressed in CHO cells in saturation binding experiments, and were followed by competition binding experiments with a variety of new synthesized opioid receptor ligands. RESULTS: The Kd and Bmax of [3H] diprenorphine bound to mu receptors were 1.06 nmol/L and 930 fmol/mg protein, respectively. Competition binding experiments revealed that ligand 3# and 12# displayed much higher affinity than DAMGO and Morphine for the cloned mu opioid receptor. However, the affinities of ligands 2#, 6#, 8# and 9# were lower than DAMGO and Morphine. CONCLUSION: The present results suggest that the new ligands 3# and 12# have higher affinity to mu opioid receptors. However, ligands 2#, 6#, 8# and 9# have lower affinity to mu opioid receptors.