川陈皮素对肺癌的增殖抑制作用及其机制

目的 观察川陈皮素对肺癌的体内外抑瘤作用并初步探讨其机制.方法 应用MTT法检测不同浓度川陈皮素作用对人肺腺癌细胞A549增殖的抑制作用.Western blot检测川陈皮素处理后A549细胞Bcl-2和Bax蛋白的表达情况.彗星电泳检测川陈皮素作用后A549细胞DNA损伤情况.通过C57BL/6小鼠Lewis肺癌模型进行体内抗瘤实验,TUNEL法观察药物作用后的肿瘤细胞凋亡情况,并用免疫组化法检测瘤组织中Bax、Bcl-2和Caspase-9蛋白表达情况.结果 体外实验显示,川陈皮素作用对A549细胞有明显的增殖抑制作用,并且抑制效应随浓度增加而增强;川陈皮素作用A549细胞24 h后,随着作用剂量的加大,Bcl-2蛋白表达下调,而Bax蛋白则表达上调;对细胞DNA具有损伤作用,当达到一定作用剂量和作用时间时可以使A549细胞发生凋亡.体内抑瘤实验表明,川陈皮素高(300 mg/kg)、中(200 mg/kg)、低(100 mg/kg)浓度组对小鼠Lewis肺癌的抑瘤率分别为43.70%、27.59%和20.14%,与对照组相比,差异具有统计学意义(P<0.01);川陈皮素能使Lewis肺癌细胞发生凋亡;使Lewis肺癌组织内Bax和Caspase-9表达上调,Bcl-2表达下调.结论 川陈皮素在体内外均有明显的抑制肿瘤细胞增殖的作用,其作用机制可能与改变Bcl-2/Bax的比值,启动Caspase级联反应相关.

Inhibition Effect and Its Mechanism of Nobiletin on Proliferation of Lung Cancer Cells

Objective To investigate inhibition effect and its mechanism of Nobiletin on the proliferation of lung cancer cells in vivo and in vitro.MethodsHuman lung adenocarcinoma cell line A549 was treated with various dose of Nobiletin,and cell proliferation was tested by MTT assay.DNA damage of A549 cells was detected by comet assay.Expression of Bcl-2 and Bax proteins were analyzed by Western blot assay.Lewis lung carcinoma(LLC)models were established in C57BL/6 mice and treated with Nobiletin once a day for 12 d...