Department of Molecular Pathology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
Am J Pathol. 2011 Dec;179(6):2920-30. doi: 10.1016/j.ajpath.2011.08.022. Epub 2011 Oct 11.
A relationship exists between defects in bone morphogenetic protein (BMP) signaling and formation of hamartoma and adenoma in the gastric epithelium; however, the role of BMP signaling in the progression of diffuse-type gastric carcinoma remains unknown. We investigated whether BMP functions as a tumor suppressor in human diffuse-type gastric carcinoma using three different human diffuse-type gastric carcinoma cell lines (OCUM-12, HSC-39, and OCUM-2MLN). Overexpression of the dominant-negative form of BMP-2/4-specific type I receptor (ALK-3) in OCUM-12 and HSC-39 cells accelerated their growth in vivo. BMP-4 induced cell cycle arrest in these cells via p21 induction through the SMAD pathway. Moreover, overexpression of the constitutively active form of ALK-3 in HSC-39 and OCUM-2MLN cells suppressed the proliferation of these cells in vitro and in vivo. Our findings suggest that BMP-2 and BMP-4 function as potent tumor suppressors in diffuse-type gastric carcinoma.
骨形态发生蛋白(BMP)信号缺陷与胃上皮的错构瘤和腺瘤形成之间存在关系;然而,BMP 信号在弥漫型胃癌的进展中的作用尚不清楚。我们使用三种不同的人弥漫型胃癌细胞系(OCUM-12、HSC-39 和 OCUM-2MLN)研究了 BMP 是否作为人弥漫型胃癌的肿瘤抑制因子发挥作用。在 OCUM-12 和 HSC-39 细胞中过表达 BMP-2/4 特异性 I 型受体(ALK-3)的显性失活形式加速了它们在体内的生长。BMP-4 通过 SMAD 通路诱导 p21 诱导使这些细胞发生细胞周期停滞。此外,在 HSC-39 和 OCUM-2MLN 细胞中过表达组成型激活形式的 ALK-3 可抑制这些细胞在体外和体内的增殖。我们的研究结果表明,BMP-2 和 BMP-4 在弥漫型胃癌中作为有效的肿瘤抑制因子发挥作用。