南京医科大学胃癌研究刊登国际期刊
9月20日,国际学术期刊《Cancer Research》在线刊登了南京医科大学与美国德克萨斯大学MD Anderson癌症中心的一项合作研究,题为“LncRNA HOXA11-AS promotes proliferation and invasion of gastric cancer by scaffolding the chromatin modification factors pRC2, LSD1 and DNMT1”,这项研究指出,LncRNA HOXA11-AS可通过构建染色质修饰因子pRC2、LSD1和DNMT1的支架,促进胃癌细胞的增殖和入侵。点击阅读南京医科大学更多研究成果:南京医科大pLOS肺癌相关miRNA;南京医科大学Nature子刊发表癌症研究新成果。
长链非编码RNAs(lncRNA)与人类癌症有关,但是其作用机制还没有得以明确证明。在这项研究中,该研究小组通过分析TCGA RNA测序数据和其他公开可用的微阵列数据,调查了导致胃癌(GC)的lncRNA变化。研究人员在这项研究中报道称,GC相关的lncRNA HOXA11-AS可作为胃癌发展和进展的一个关键调节因子。具有HOXA11-AS高表达的患者生存期更短,预后更差。体外和体内实验显示,HOXA11-AS变化揭示了一种复杂的综合表型,影响细胞的生长、迁移、侵袭和凋亡。引人注目的是,在HOXA11-AS沉默后的高通量测序分析,强调了细胞增殖和细胞黏附通路中的变化。
从机制上来看,EZH2与组蛋白去甲基化酶LSD1或DNMT1被HOXA11-AS招募,被作为一种支架。HOXA11-AS还充当miR-1297的一种分子海绵,拮抗其抑制EZH2蛋白翻译的能力。此外,研究人员发现,E2F1参与胃癌细胞中的HOXA11-AS激活。总之,这些研究结果支持一种模型,在这种模型中,EZH2/HOXA11-AS/LSD1复合物和HOXA11-AS/miR-1297/EZH2串扰可作为胃癌肿瘤发生和发展中的一个关键效应因子,从而提出了新的胃癌治疗方向。
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同期,来自南方医科大学南方医院的研究人员在国际肿瘤学期刊《Clinical Cancer Research》发表题为“Interleukin-17-producing neutrophils link inflammatory stimuli to disease progression by promoting angiogenesis in gastric cancer”的学术成果。这项研究提供了直接的证据表明,中性粒细胞在胃癌的发展过程中发挥重要的作用,并揭示了一种新的免疫逃逸机制。相关阅读:南方医胃癌研究刊登国际权威期刊。
另外,2016年4月19日,《细胞研究》(Cell Research)杂志在线发表了我国科学家在胃癌细胞起源领域的最新研究成果“Gastric Lgr5+ stem cells are the cellular origin of invasive intestinal-type gastric cancer in mice”。军事医学科学院生物工程研究所/蛋白质组学国家重点实验室杨晓课题组的研究人员建立了多种条件基因敲除导致胃癌的小鼠模型,揭示了胃Lgr5阳性干细胞在胃癌发生发展中的重要功能。相关阅读:杨晓课题组发现胃窦Lgr5阳性干细胞是浸润性胃癌的起始细胞 。
(生物通:王英)
生物通推荐原文摘要:
LncRNA HOXA11-AS promotes proliferation and invasion of gastric cancer by scaffolding the chromatin modification factors pRC2, LSD1 and DNMT1
Abstract: Long noncoding RNAs (lncRNA) have been implicated in human cancer but their mechanisms of action are mainly undocumented. In this study, we investigated lncRNA alterations that contribute to gastric cancer (GC) through an analysis of TCGA RNA sequencing data and other publicly available microarray data. Here we report the GC-associated lncRNA HOXA11-AS as a key regulator of GC development and progression. patients with high HOXA11-AS expression had a shorter survival and poorer prognosis. In vitro and in vivo assays of HOXA11-AS alterations revealed a complex integrated phenotype affecting cell growth, migration, invasion and apoptosis. Strikingly, high-throughput sequencing analysis after HOXA11-AS silencing highlighted alterations in cell proliferation and cell-cell adhesion pathways. Mechanistically, EZH2 along with the histone demethylase LSD1 or DNMT1 were recruited by HOXA11-AS, which functioned as a scaffold. HOXA11-AS also functioned as a molecular sponge for miR-1297, antagonizing its ability to repress EZH2 protein translation. In addition, we found that E2F1 was involved in HOXA11-AS activation in GC cells. Taken together, our findings support a model in which the EZH2/HOXA11-AS/LSD1 complex and HOXA11-AS/miR-1297/EZH2 crosstalk serve as critical effectors in GC tumorigenesis and progression, suggesting new therapeutic directions in gastric cancer.