CD47与胃癌相关性的研究进展
2018-05-23谭观桥吴立鹏张建文
谭观桥 吴立鹏 张建文
【摘要】 恶性肿瘤的产生是多种因素共同作用的结果,其中免疫系统在其发生与发展的过程中发挥着重要作用。随着近年来免疫检查点的不断发现,免疫治疗已成为各种恶性肿瘤的治疗热点。CD47是一种广泛表达的跨膜糖蛋白,最近的研究显示CD47/SIRPα轴可以作为新的免疫治疗靶标。CD47高表达于肿瘤细胞表面,通过与巨噬细胞表面的配体SIRPα结合,发出“不吃我”信号,使肿瘤细胞免于巨噬细胞的吞噬,从而促进肿瘤的发生与发展。本文从CD47的结构与生理功能、抗肿瘤的机制进行阐述,并对CD47在胃癌的表达与预后及治疗中的作用进行综述。
【关键词】 CD47; 胃癌; CD47/SIRPα; 巨噬细胞; 免疫治疗
Research Progress on the Relationship between CD47 and Gastric/TAN Guanqiao,WU Lipeng,ZHANG Jianwen.//Medical Innovation of China,2018,15(08):136-139
【Abstract】 The production of malignant tumors is a result of a combination of factors that play an important role in the development and progression of the immune system.With the continuous discovery of immune checkpoints in recent years,immunotherapy has become a hot spot for the treatment of various malignancies.CD47 is a widely expressed transmembrane glycoprotein,and recent studies have shown that CD47 can be used as a new immunotherapy target.Its high expression on the surface of tumor cells,through the receptor with the surface of macrophages SIRPα binding,issued a “dont eat me” signal,the tumor cells from phagocytosis of macrophages,thereby promoting the occurrence and development of tumors.This article describes the structure and physiological function of CD47 and the mechanism of anti-tumor,and reviews the role of CD47 in the expression, prognosis and treatment of gastric cancer.
【Key words】 CD47; Gastric cancer; CD47/SIRPα; Macrophage; Immunotherapy
First-authors address:The First Peoples Hospital of Chenzhou Affiliated University of South China,Chenzhou 423000,China
doi:10.3969/j.issn.1674-4985.2018.08.034
胃癌是全球最常见的消化道恶性肿瘤之一,其发病率位居恶性肿瘤的第四位,死亡率居恶性肿瘤的第二位。由于胃癌早期症状都不明显,直到它进展到晚期才被诊断出来,而此时已丧失了治疗胃癌的最佳时机,导致我国胃癌患者预后普遍较差。目前针对胃癌治疗的有效药物仍较少,胃癌的死亡率仍居高不下。近年来癌症免疫治疗逐渐成为各类恶性肿瘤领域的热点,各种免疫治疗靶标的出现,也为癌症免疫治疗提供了突破口,CD47/信号调节蛋白α(SIRPα)轴就是其中一种免疫治疗靶标。CD47通过高表达肿瘤细胞表面,与巨噬细胞表面配体SIRPα结合,发出“不要吃我”信号,从而达到免疫逃逸,以促进肿瘤的发生与发展。而抗CD47抗体又能阻断CD47/SIRPα轴,激活巨噬细胞对肿瘤细胞的吞噬作用,从而达到治愈肿瘤的目的。……
