| 摘要: | 本研究主要以血管內皮E.A. hy 926細胞株為實驗模式，探討十字花科蔬菜衍生物indole-3-carbinol (I3C)、indolo3,2-bcarbazole (ICZ)、β-phenylethyl isothiocyanate (PEITC)及benzyl isothiocyanate (BITC)對於血管內皮細胞一氧化氮合成?(eNOS)以及TNF-α誘導之黏著分子表現的影響，並進一步瞭解其可能之機制。由MTS細胞毒性分析結果顯示，不論有無TNF-α(10 ng/ml)誘導下，除了BITC於10μM會造成細胞毒性外，其餘衍生物(1 nM ~ 10μM)皆不會對細胞造成毒性傷害。以adhesion assay分析單核球U937細胞株黏著於血管內皮E.A. hy 926細胞株之結果指出，除I3C外，10μM之ICZ、PEITC及BITC皆可抑制由TNF-α誘導之U937黏著於E.A. hy 926細胞。Western blot分析結果顯示，唯有10μM之PEITC與BITC可增加eNOS蛋白質之表現。RT-PCR與ELISA結果指出，1nM ~ 10μM之ICZ、PEITC及BITC可分別抑制由TNF-α誘導之ICAM-1 mRNA表現，然而這些衍生物並不影響細胞膜表面ICAM-1蛋白質之表現。此外，1nM ~ 10μM之PEITC、10μM之ICZ及BITC亦可分別抑制由TNF-α誘導之VCAM-1 mRNA，而10μM之ICZ、PEITC與BITC皆可分別抑制細胞膜表面VCAM-1之蛋白質表現。而I3C對ICAM-1與VCAM-1 mRNA與蛋白質之表現皆無顯著影響。總而言之，10μM之十字花科蔬菜衍生物PEITC與BITC可增加eNOS蛋白質表現，且10μM之ICZ、PEITC與BITC也可藉由抑制VCAM-1 mRNA表現而減少細胞膜表面VCAM-1蛋白質表現，進而減少單核球細胞黏著於內皮細胞；然而，ICZ、PEITC及BITC雖可抑制ICAM-1 mRNA之表現，但不影響細胞膜表面ICAM-1蛋白質之含量，而I3C對這些分子皆無顯著影響。
The purpose of this study was to investigate the effects of cruciferous vegetable derivatives, indole-3-carbinol (I3C), indolo3,2-bcarbazole (ICZ), β-phenylethyl isothiocyanate (PEITC) and benzyl isothiocyanate (BITC) on the expression of endothelial nitric oxide synthase (eNOS) and adhesion molecules in TNF-α stimulated endothelial E.A. hy 926 cells. The results obtained from MTS assay showed that all derivatives (1nM ~ 10μM), except 10μM BITC, did not affect cells viability regardless of the presence of TNF-α. Adhesion analyses showed that 10μM ICZ, PEITC and BITC, but not I3C, inhibited the adhesion of TNF-α-induced monocytic U937 cells to E.A. hy926 cells. Western blot analyses indicated that 10μM PEITC and BITC, except I3C and ICZ, enhanced the expression of eNOS protein. RT-PCR and Cell-ELISA analyses showed that 1nM ~ 10μM ICZ, PEITC and BITC inhibited the expression of TNF-α-induced ICAM-1 mRNA, but all derivatives had no effect on the expression of cell-surface ICAM-1 protein. On the other hand, 1nM ~ 10μM PEITC, 10μM ICZ and BITC inhibited the expression of TNF-α-induced VCAM-1 mRNA and 10μM ICZ, PEITC and BITC inhibited the expression of cell-surface VCAM-1 protein. However, I3C did not show any suppressive effects on these factors. In conclusion, cruciferous vegetable derivatives, PEITC and BITC increased eNOS protein and ICZ, PEITC and BITC inhibited cell-surface VCAM-1 protein through decreased the expression of VCAM-1 mRNA, and thus reduced monocytes adhesion to endothelial cells. However, all derivatives, except I3C, inhibited the expression of ICAM-1 mRNA, although they did no affect the expression of cell-surface ICAM-1 protein. |
