Klotho通过抑制自噬逆转乳腺癌紫杉醇耐药的作用机制研究

摘要

Objective To investigate the mechanism of klotho reversing the resistance of breast cancer to paclitaxel in MCF-7/PTX cells.Methods The Klotho expression in MCF-7 and MCF-7/PTX cells was detected by Western blot.The effects of Klotho on paclitaxel resistance in MCF-7/PTX cells was measured by MTT assay.The effects of Klotho and 3-methyladenine (3-MA) on proliferation and expression of Beclin1 in MCF-7/PTX cells were detected by MTT and Western blot assay,respectively.Results The expression of Klotho in MCF-7/PTX cells was decreased compared with MCF-7 cells.Klotho could sensitize MCF-7/PTX cells to paclitaxel.The expression of Beclin1 in MCF-7/PTX cells was higher than that in MCF-7 cells.Klotho and 3-MA could decrease the expression of Beclin1 in MCF-7/PTX cells,and the effects of Klotho on paclitaxel resistance in MCF-7/PTX cells was similar to that of 3-MA.Conclusion Paclitaxel resistance in breast cancer cells is related to expression of the Klotho which can reverse the resistance of breast cancer to paclitaxel by inhibiting autophagy.%目的 探讨Klotho逆转乳腺癌紫杉醇耐药的分子机制.方法 Western blot法检测乳腺癌细胞MCF-7与紫杉醇耐药的乳腺癌细胞MCF-7/PTX中Klotho的表达情况,MTT法检测Klotho对MCF-7/PTX细胞紫杉醇耐药的影响;Western blot法考查Klotho与自噬抑制剂3-methyladenine(3-MA)对MCF-7/PTX细胞Beclin1蛋白表达的影响,并利用MTT法检测Klotho与3-MA对该细胞紫杉醇耐药的影响.结果 MCF-7/PTX细胞中Klotho的表达较MCF-7细胞低,Klotho可增强MCF-7/PTX细胞对紫杉醇的敏感性;MCF-7/PTX细胞中Beclin1表达较MCF-7细胞高,而Klotho与3-MA均可降低该细胞中Beclin1的表达,且Klotho对该细胞紫杉醇耐药的逆转作用与3-MA相仿.结论 乳腺癌细胞的紫杉醇耐药与Klotho表达有关,Klotho可通过抑制自噬进而逆转乳腺癌紫杉醇耐药.