Hedgehog信号通路在胚胎发育、组织再生中发挥重要的作用,且与癌症发生发展密切相关.其胞内调控组分Suppressor of Fused(SuFu)蛋白通过结合转录因子Gli(s),负调控该信号通路,但其作用的分子机制仍不甚清楚.在本项研究中,以人SuFu作为诱饵蛋白,利用酵母双杂交技术成功地筛选到1个新的相互作用因子—蛋白酶体成熟蛋白(POMP).通过免疫共沉淀、体外GST pull-down和免疫细胞化学实验验证其相互作用.为了探究POMP与SuFu的相互作用对Hedgehog信号通路的影响,构建了POMP的过表达质粒和干扰质粒(miR-RNAi)以及转录因子Gli活性检测系统,即荧光素酶报告基因法,结果显示,过表达SuFu蛋白时POMP正调控Hedgehog信号通路,而下调POMP的表达则抑制Gli的活性.该研究结果揭示了POMP新的生物学功能,为阐明Hedgehog信号通路的具体分子机制提供了新的线索.
Epithelial ovarian carcinoma (EOC) is the most common form of ovarian malignancies and the most lethal gynecologic malignancy in the United States. To date, in spite of treatment to it with the extensive surgical debulking and chemotherapy, the prognosis of EOC remains dismal. Recently, it has become increasingly clear that in many instances, the signaling and molecular players that control development are the same, and when inappropriately regulated, drive tumorigenesis and cancer development. Here, we discuss the possible involvement of Hedgehog (Hh) pathway in the cellular regulation and development of cancer in the ovaries. Using the in vitro and in vivo assays developed has facilitated the dissection of the mechanisms behind Hh-driven ovarian cancers formation and growth. Based on recent studies, we propose that the inhibition of Hh signaling may interfere with spheroid-like structures in ovarian cancers. The components of the Hh signaling may provide novel drug targets, which could be explored as crucial combinatorial strategies for the treatment of ovarian cancers.
以Hedgehog信号通路关键负调控因子Suppressor of Fused(SuFu)蛋白作为诱饵蛋白,利用酵母双杂交系统从人均一化cDNA文库中筛选与之相互作用的蛋白质,共获得160个阳性克隆,包括Hedgehog信号通路蛋白Gli3和一些肿瘤蛋白如乙醛脱氢酶1(ALDH1A1)、激酶、转运蛋白、转录因子等.通过免疫共沉淀和免疫细胞化学实验证实,SuFu与ALDH1A1发生相互作用,后者可能参与Hedgehog信号通路的调控.
