白藜芦醇的抗肿瘤作用免疫学机制的初步探讨

目的:探讨白藜芦醇(Res)抗肿瘤作用的免疫学机制。方法:用MTT比色法测定肿瘤细胞生长抑制率,流式细胞术分析其细胞周期。分别采用MTT比色法、溶血分光光度法、改良的Mayer法及双抗体夹心ELISA法,检测荷瘤小鼠的免疫功能及细胞因子的水平。结果:Res可以时间-剂量依赖的方式抑制肿瘤细胞增殖、促进其凋亡,出现明显的凋亡峰和G0/G1期阻滞现象;抑瘤率最高可达42.76%。Res可增强NK细胞的杀伤力、T细胞增殖、抗体的分泌及CH50活性,并呈剂量依赖性。Res还可显著提高IL-2和TGF-β1的含量;减少IL-8和VEGF的分泌。结论:Res既可直接作用于肿瘤细胞,也可通过提高机体细胞与体液免疫应答的水平,调节细胞因子的分泌,而发挥抗肿瘤作用。

Preliminary study on anti-tumor function of resveratrol and its immunological mechanism

AIM: To explore the immunological mechanism of the anti-tumor function of resveratrol (Res) through in vitro or vivo experiments. METHODS: The tumor cell growth repression rate was measured by MTT colorimetry. Flow cytometry was used to analyze the cell cycle of Hep2 cells (laryngeal squamous cancer cell line). The immune function and cytokine levels in the serum of the tumor-bearing mice were determined by MTT colorimetry, hemolysis spectrophotography, improved Mayer's method and ELISA. RESULTS: Res inhibited the tumor cell growth and enhanced the apoptosis of tumor cells in time-concentration-dependent manners showing the phenomenon of obvious G(0)/G(1) blocking and apoptotic peak. The maximal tumor inhibition rate came up to 42.76%. Furthermore, Res improved function of T, B lymphocytes, killing activity of NK cells, release of antibodies, and the total complement activity in serum. It also increased contents of IL-2 and TGF-beta1 but reduced that of IL-8 and VEGF. CONCLUSION: Res can not only affect tumor cells directly but also exert anti-tumor efficiency through reinforcing cell-mediated, humoral immune response and accommodating lymphocytes to secrete cytokines.