Abstract

背景与目的已有的研究发现骨形成蛋白7(bone morphogenetic protein 7, BMP7)具有抑制和促进多种肿瘤发生发展的双重作用,但其对肺癌细胞增殖的影响及其具体机制尚不明确。本实验首先检测了外源性BMP7对肺癌细胞增殖的影响,然后通过在肺癌细胞系中阻断不同的Ⅰ型受体,观察其对BMP7生物学作用的影响,以探讨不同的Ⅰ型受体在BMP7信号传导过程中的作用。方法应用RT-PCR及MTT方法分别检测4种非小细胞肺癌(non-small cell lung cancer, NSCLC)细胞系和人支气管上皮细胞系(HBE)中BMP7 Ⅰ型受体的表达情况及外源性BMP7对肺癌细胞增殖能力的影响,并联合运用抗体阻断的方法阻断NCI-H460细胞中内源性Ⅰ型抗体,采用MTT法检测BMP7对NCI-H460细胞增殖的影响,分析不同的Ⅰ型受体在BMP7信号传导过程中的作用。结果NCI-H460细胞系中三种Ⅰ型受体均有表达。外源性BMP7抑制了肺大细胞癌NCI-H460细胞的增殖(P=0.002)。运用特异性抗体阻断NCI-H460细胞内源性BMPR1A、BMPR1B、BMPR1A+BMPR1B后BMP7对NCI-H460增殖的抑制作用明显减弱(P=0.003, P=0.014, P < 0.001),而阻断ACVR1A后BMP7对NCI-H460增殖的抑制作用无明显变化(P=0.074)。结论BMP7通过激活BMPR1A、BMPR1B两种Ⅰ型受体抑制NCI-H460细胞的增殖。

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