ABSTRACT
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.
