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阻断PI3K/Akt信号通路逆转人乳腺癌细胞株MCF-7/ADR的多药耐药 被引量:7

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摘要 目的:探讨阻断PI3K/Akt通路对乳腺癌细胞多药耐药的逆转作用及相关信号转导机制。方法:MTT法测定乳腺癌细胞MCF-7和MCF-7/ADR对阿霉素的半数抑制浓度(IC50)。对MCF-7/ADR进行PI3K/Akt通路抑制剂LY294002不联合或者联合用药,MTT法检测细胞对阿霉素的敏感性。Western Blot检测加与不加LY294002时,PI3K/Akt通路、P-gp及Survivin激活情况。结果:(1)阿霉素对MCF-7和耐药细胞MCF-7/ADR的IC50分别为(0.28±0.04)μmol/L和(18.89±2.48)μmol/L,耐药倍数为66倍。(2)联合使用LY294002之后,耐药细胞MCF-7/ADR的IC50降至(3.21±0.08)μmol/L,耐药倍数降低至8,且细胞对药物敏感性明显增加。(3)耐药细胞株MCF-7/ADR中PI3K/Akt通路激活,GSK-3被抑制,且P-gp、Survivin等促存活蛋白活性高;阿霉素联合使用LY294002之后,MCF-7/ADR中PI3K/Akt/GSK-3、P-gp、Survivin等均被抑制。结论:LY294002联合阿霉素可有效增加MCF-7/ADR的化疗敏感性;LY294002通过抑制PI3K/Akt/GSK-3通路、进而抑制P-gp、Survivin促存活蛋白激活,从而有效逆转了MCF-7/ADR的耐药性。
出处 《实用医学杂志》 CAS 北大核心 2014年第5期709-711,共3页 The Journal of Practical Medicine
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