Effect of 2,3,5,4'-tetrahydroxystilbene-2-O-beta-D-glucoside on lipoprotein oxidation and proliferation of coronary arterial smooth cells.

To investigate the effects of 2,3,5,4'-tetrahydroxystilbene-2-O-beta-D-glucoside (THSG), a compound extracted from the root of Polygonum multiflorum Thunb, on lipoprotein (LDL and VLDL) oxidation, proliferation and nitric oxide (NO) content of coronary arterial smooth cells (CASMCs) induced by LDL, VLDL, ox-LDL and ox-VLDL. The oxidation level of lipoprotein was determined by thiobabituric acid (TBA) method and agarose gel electrophoresis. The proliferative degree was determined by 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide (MTT) method. The NO content was assayed by nitrate reductase method. (1)THSG (0.1 - 100 mumol L(- 1)) could dose-dependently prevent lipoprotein from oxidation induced by Cu(2 + ) and CASMCs. (2)THSG (0.1 - 100 micromol L(- 1)) inhibited porcine CASMCs proliferation elicited by LDL, VLDL, ox-LDL and ox-VLDL. (3)THSG (0.1 - 100 micromol L(- 1)) counterpoised the decrease of NO content in CASMCs evoked by LDL, VLDL, ox-LDL and ox-VLDL. As compared with control, it was found that the threshold concentration of THSG, which significantly exerted the actions mentioned above, were at the concentration of 1 micromol.L(- 1) (P < 0.01). In conclusion, THSG possesses the antagonistic effects on oxidation of lipoprotein, proliferation and decrease of NO content of CASMCs, which partially explain the mechanism of anti-atherosclerosis of Polygonum multiflorum Thunb.