肝癌干细胞在肝细胞癌中的作用和靶向治疗策略
DOI: 10.12449/JCH260229
Role of liver cancer stem cells in hepatocellular carcinoma and related strategies for targeted therapy
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摘要: 肝细胞癌(HCC)是一种全球范围内发病率与死亡率均较高的恶性肿瘤,其治疗抵抗及复发机制与肝癌干细胞(LCSC)密切相关。本文系统介绍了LCSC的生物学特征及其在HCC进展中的关键作用,回顾了上皮细胞黏附分子、CD133等特异性表面标志物及相关信号通路(Wnt/β-连环蛋白、转化生长因子-β、信号转导与转录激活因子3)的功能特性,阐述了LCSC与肿瘤微环境之间的相互作用,并总结了靶向LCSC的最新临床治疗策略及现有耐药机制的对策。文章指出,LCSC通过代谢重编程与免疫微环境重塑促进肿瘤的发生发展;提出应建立LCSC特异性标志物的标准化检测体系,并推动以靶向治疗、免疫调节与传统化疗相结合的三联协同治疗模式,为HCC的临床干预提供新思路。Abstract: Hepatocellular carcinoma (HCC) is a malignant tumor with relatively high incidence and mortality rates worldwide, and its therapeutic resistance and recurrence mechanism are closely associated with liver cancer stem cells (LCSC). This article systematically introduces the biological characteristics of LCSC and their key role in the progression of HCC, reviews the functional characteristics of the specific surface markers (such as EpCAM and CD133) and related signaling pathways (such as Wnt/β-catenin, TGF-β, and STAT3), elaborates on the interaction between LCSC and tumor microenvironment, and summarizes the latest clinical treatment strategies targeting LCSC and the countermeasure for existing resistance mechanisms. The article points out that LCSC promote tumor development and progression through metabolic reprogramming and immune microenvironment remodeling, and it is proposed to establish a standardized detection system for LCSC specific markers and promote a triple synergistic therapeutic paradigm combining targeted therapy, immune regulation, and traditional chemotherapy, in order to provide new ideas for the clinical intervention of HCC.
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注: hEpAb2-6,人源化抗体2-6;EpCAM,上皮细胞黏附分子;EpEx,上皮细胞黏附分子胞外结构域;EpICD,上皮细胞黏附分子胞内结构域;DAPT,γ-分泌酶抑制剂;Frizzled,卷曲受体;LRP,低密度脂蛋白受体相关蛋白;Dvi,蓬乱蛋白;GSK3,糖原合成酶激酶3;CK1,酪蛋白激酶1;Axin,轴蛋白;APC,腺瘤性结肠息肉病蛋白;β-catenin,β-连环蛋白;TCF,T细胞因子;XAV939、ICG-001,β-catenin抑制剂;LRP5/6,低密度脂蛋白受体相关蛋白5/6;Snail,蜗牛蛋白;Twist,Twist蛋白;ZEB1,锌指E盒结合同源框蛋白1;E-cadherin,上皮型钙黏蛋白;MMP,基质金属蛋白酶;Cyclin D1,细胞周期蛋白D1;CD44,白细胞分化抗原44;CD133,白细胞分化抗原133;Nanog、Oct4,干细胞相关转录因子;ABCG2,腺苷三磷酸结合盒转运蛋白G2。
图 1 LCSC表面的EpCAM通过Wnt/β-catenin信号通路发挥作用机制图
Figure 1. Mechanism diagram of EpCAM on LCSC surface acting through Wnt/β-catenin signal pathway
注: LCSC,肝癌干细胞;Ihh,印度刺猬蛋白;Dhh,沙漠刺猬蛋白;Shh,sonic刺猬蛋白;HhN,刺猬蛋白N端结构域;PTCH1,patched同源蛋白1;IPI-926,Hedgehog通路抑制剂;SMO,smoothened同源蛋白;COS2/Kif7,Costal-2/驱动蛋白家族成员7;SuFu,抑制融合蛋白;Gli1/2,Gli转录因子1/2;Gli1/2-Act,活化的Gli转录因子1/2;Nanog、Oct4,干细胞相关转录因子;Sox2,SRY框转录因子2;Vismodegib、Glasdegib,Hedgehog通路抑制剂;5E1抗体,抗sonic刺猬蛋白单克隆抗体。
图 2 Hedgehog通路维持LCSC干细胞特性机制图
Figure 2. Mechanism diagram of Hedgehog pathway in maintaining stem cell characteristics LCSC
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