氯丙嗪逆转氧化低密度脂蛋白对人红细胞左旋精氨酸转运的抑制作用

The influence of chlorderazin on the change of L-arginine transport in human erythrocytes induced by oxidized low density lipoprotein

目的 观察磷脂酶A2 抑制剂氯丙嗪对氧化低密度脂蛋白 (OX LDL)所致人红细胞左旋精氨酸 (L arg)转运变化的影响。方法 取 6例健康成人红细胞 ,制备红细胞悬液。将其分别与OX LDL和氯丙嗪分组孵育。实验分 3组 :对照组、OX LDL组和OX LDL加氯丙嗪组 ,分别测定红细胞3H L arg的转运参数。结果 与对照组比较 ,OX LDL组红细胞L Arg总摄入的最大转运速率 (Vmax值 )较对照组降低 33% (P <0 0 5 ) ,亲和力明显减小 (米氏常数Km值增大 ,P <0 0 5 )。OX LDL加氯丙嗪组与OX LDL组相比 ,红细胞L arg的总转运及经y +载体介导的转运均增加 ,Vmax值分别增加了2 5 %和 37% (P <0 0 1) ,亲和力明显增大 (Km值减小 ,P <0 0 5 ) ;两组间经y +L载体介导的转运Vmax和Km值差异无显著性。结论 OX LDL可抑制红细胞L arg的跨膜转运 ,而氯丙嗪可逆转这一过程。

Objective To observe the influence of chlorderazin on the change of L-arginine transport in human erythrocytes induced by oxidized low density lipoprotein. Methods Human erythrocytes were obtained from six healthy donors. The study included three groups: Gr1 (control)? Gr2 (incubated with OX-LDL) and Gr3 (incubated with OX-LDL and chlorderazin, a PLA 2 inhibitor). The 3H-L-arginine transport was measured.Results Compared with Gr1, the Vmax for the total transport of L-arginine in erythrocytes in Gr2 decreased by 33%, and Km value increased. Compared with Gr2, the Vmax for the total transport and the transport via system y+ of L-arginine in erythrocytes in Gr3 increased by 37% and 25% respectively, and Km values decreased for both. But the change of L-arginine transport by system y+L was not statistically significant.Conclusion OX-LDL could inhibit L-arginine transport in human erythrocytes, which could be reversed by chlorderazin, a nonspecific PLA 2 inhibitor.