半枝莲提取物对H22荷瘤小鼠免疫功能的影响及其抑瘤作用

Antitumor and immune-modulating effects of Scutellaria barbata extract in mice bearing hepatocarcinoma H22 cells-derived tumor

目的探讨中药半枝莲提取物(ESB)的抗肝癌作用及对荷瘤小鼠免疫功能的影响。方法将接种H22肝癌细胞的小鼠分为模型组、ESB高、中、低剂量组(12、6、3g/kg)、5-氟尿嘧啶组(5-Fu组),另设正常对照组,连续给药10d。观察小鼠瘤重、体质量、胸腺指数和脾指数;并检测各组淋巴细胞增殖活性、NK细胞活性及脾细胞IL-2分泌量。结果ESB中、高剂量可明显抑制荷瘤小鼠移植瘤的生长,抑瘤率分别为28.68%、36.98%,而且能明显增加小鼠胸腺指数和脾指数(P<0.01),而5-Fu组胸腺指数和脾指数明显降低。模型组荷瘤小鼠脾淋巴细胞增殖活性、NK细胞活性及分泌IL-2能力均明显低于正常对照组(P<0.05)。与模型组比较,5-Fu组荷瘤小鼠的NK细胞活性和脾细胞IL-2分泌量进一步降低(P<0.05)。而ESB高剂量组三者均得到明显改善。ESB中剂量治疗使荷瘤小鼠的NK细胞活性增强,与模型组比较差异显著(P<0.05)。结论ESB可明显抑制H22移植瘤的生长,改善荷瘤小鼠的免疫功能。

Objective To investigate the effects of Scutellaria barbara extract （ESB） in suppressing tumor growth and modulating the immune functions in mice bearing tumors derived from hepatocarcinoma H22 cells. Methods Fifty mice inoculated subcutaneously with H22 cells were equally divided into the model group, high-, moderate-, and low-dose ESB groups, and 5-Fu group, with corresponding treatments for 10 days. Another 10 mice with only saline injection served as the normal control group. The body weight, tumor mass, thymus index and spleen index of the mice were measured, and the lymphocyte proliferation activity, NK cell activity and interleukin-2 （IL-2） production by the splenocytes were detected. Results Moderate- and high-dose ESB significantly suppressed the tumor growth with tumor inhibition rate of 28.68% and 36.98%, respectively. ESB treatment at moderate and high doses significantly increased the thymus index and spleen index （P〈0.01）, which were decreased significantly in 5-Fu group. The lymphocyte proliferation activity, NK cell activity and IL-2 production by the splenocytes were significantly lower in the model group than in the normal group （P〈0.05）. Compared with the model group, ESB at the high dose obviously increased the three indexes above mentioned. The NK cell activity was also significantly improved in moderate-dose ESB group （P〈0.05）. Conclusion ESB can suppress the growth of H22 implant tumor and enhance the immune function of the tumor-beating mice.