【摘要】 MEK1/2抑制剂在作用于三阴乳腺癌(TNBC)细胞时,会负反馈引起PI3K/AKT/mTOR信号通路的激活。对于PI3K抑制剂不敏感的TNBC细胞,无法选择PI3K抑制剂和MEK1/2抑制剂联合。本研究选择联合mTOR1/2抑制剂(AZD8055)和MEK1/2抑制剂(PD0325901)作用于TNBC细胞。在MDA-MB-435细胞中,AZD8055可以抑制由PD0325901导致的PI3K通路的负反馈激活,从而完全抑制MDA-MB-435细胞中ERK1/2通路和PI3K通路的活性。DNA复制实验与细胞增殖抑制结果证明二者具有协同抑制细胞增殖的作用,细胞周期实验证明二者联合后协同引起细胞周期中的G1期阻滞。更多还原

【Abstract】 MEK inhibition activates PI3K/AKT/mTOR pathway in triple negative breast cancer(TNBC) cell lines. Combination of PI3 K inhibitor and MEK1/2 inhibitor is not appropriate for PI3 K inhibitor insensitive TNBC cell lines. This study was designed to investigate the effects of dual treatments with mTOR1/2 inhibitor AZD8055 and MEK1/2 inhibitor PD0325901 in MDA-MB-435 cell line. MEK1/2 inhibition led to activation of AKT, which is the downstream signaling protein of PI3 K pathway. The combination inhibited the phosphorylation of AKT and therefore abolished the feedback interaction of two pathways. Cell proliferation assay and DNA replication assay demonstrated that the dual treatments led to a significant synergistic inhibition of cell cycle progression and cell proliferation.更多还原