SCI REP:SLC7A11的下调增强了MCF-7乳腺癌细胞中ROS诱导的P-gp过表达和耐药性

2017-06-19 MedSci MedSci原创

化疗是目前乳腺癌治疗中最有效的治疗方法之一。 自从20世纪90年代中期引入化疗和早期诊断以来,乳腺癌发病率和死亡率明显降低,乳腺癌患者的寿命延长。阿霉素(ADR)诱导乳腺癌细胞中P-糖蛋白(P-gp)的过表达和多重耐药性。然而,生化过程和潜在机制尚不清楚。我们以前的研究表明,ADR增加了活性氧(ROS)的产生和谷胱甘肽(GSH)生物合成的减少,而N-乙酰半胱氨酸,作为ROS清除剂,可以逆转P-gp

化疗是目前乳腺癌治疗中最有效的治疗方法之一。 自从20世纪90年代中期引入化疗和早期诊断以来,乳腺癌发病率和死亡率明显降低,乳腺癌患者的寿命延长。阿霉素(ADR)诱导乳腺癌细胞中P-糖蛋白(P-gp)的过表达和多重耐药性。然而,生化过程和潜在机制尚不清楚。我们以前的研究表明,ADR增加了活性氧(ROS)的产生和谷胱甘肽(GSH)生物合成的减少,而N-乙酰半胱氨酸,作为ROS清除剂,可以逆转P-gp的过度表达。本研究表明,ADR抑制MCF-7细胞中胱氨酸(GSH的来源)和SLC7A11转运蛋白(负责胱氨酸摄取)的活性。我们第一次表明,SLC7A11的下调/沉默或胱氨酸剥夺或增强的ROS暴露显着增加了MCF-7细胞中P-gp的表达。SLC7A11的下调显着增强了ROS诱导的MCF-7细胞中P-gp过表达和耐药性;抑制/沉默的SLC7A11或胱氨酸剥夺和增加的ROS的组合显着促进P-gp表达,其可被N-乙酰半胱氨酸逆转。相比之下,SLC7A11的过度表达或补充足够的胱氨酸或用N-乙酰半胱氨酸处理显着降低P-gp的表达和活性。有人提出ROS和SLC7A11 /胱氨酸是负责P-gp表达和功能的两个相关因素,SLC7A11可能是调节ADR抗性的潜在靶标。

原文出处:

Guangji Wang,Jiye Aa,et al.The down-regulation of SLC7A11 enhances ROS induced P-gp over-expression and drug resistance in MCF-7 breast cancer cells.[J]Scientific Reports 7, Article number:3791(2017),doi:10.1038/s41598-017-03881-9

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