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大黄素增强吉西他滨对裸鼠SW1990细胞移植瘤的抑瘤作用

Keywords: 大黄素,吉西他滨,胰腺癌,凋亡,Bcl-2/Bax,CytochromeC

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Abstract:

目的:探讨大黄素增强吉西他滨对裸鼠SW1990细胞移植瘤的抑瘤作用及其机制。方法:在裸鼠SW1990细胞移植瘤的动物模型上,分为生理盐水组(N组),大黄素组(E组,40mg·kg-1),吉西他滨组(G组,125mg·kg-1),联合用药组(E+G组,大黄素40mg·kg-1+吉西他滨80mg·kg-1)。各组均采取腹腔注射药物,3d1次,前后共11次。观察各组用药过程中肿瘤体积、瘤重、体重的变化。末次用药后1周处死裸鼠取肿瘤组织。采用Tunel法检测各组肿瘤组织凋亡情况。采用免疫组织化学染色法和Westernblot法检测肿瘤组织凋亡相关蛋白Bax,Bcl-2和CytochromeC的表达变化。结果:末次用药后1周E+G组肿瘤体积和瘤重明显小于其他各组;Tunel法显示E+G组肿瘤细胞凋亡比其余各组显著增多;免疫组织化学染色和Westernblot法显示E+G组的Bax,CytochromeC的表达比其他各组显著增多,而Bcl-2的表达比其余各组明显降低,经计算Bcl-2/Bax显著下降。结论:大黄素能显著增强吉西他滨对裸鼠体内人胰腺癌SW1990细胞移植瘤的抑瘤效果,其机制可能是大黄素通过促进胰腺癌SW1990细胞中Bax的表达和抑制Bcl-2的表达,降低Bcl-2/Bax,继而促进线粒体CytochromeC释放,从而增强吉西他滨对胰腺癌SW1990细胞移植瘤的促凋亡作用,达到增强吉西他滨在体内的抑瘤效果。

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