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EPCAM - 版本历史
2026-04-18T11:44:43Z
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2025年12月30日 (二) 12:21 77921020
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77921020
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2025年12月30日 (二) 12:21 77921020
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77921020
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77921020：建立内容为“<div style="padding: 0 4%; line-height: 1.8; color: #1e293b; font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', Arial, sans-serif; background-color: #ffffff…”的新页面
2025-12-30T12:20:46Z
<p>建立内容为“<div style="padding: 0 4%; line-height: 1.8; color: #1e293b; font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', Arial, sans-serif; background-color: #ffffff…”的新页面</p>
<p><b>新页面</b></p><div><div style="padding: 0 4%; line-height: 1.8; color: #1e293b; font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', Arial, sans-serif; background-color: #ffffff; max-width: 1200px; margin: auto;"><br />
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<strong>EPCAM</strong>（Epithelial Cell Adhesion Molecule），即<strong>[[上皮细胞黏附分子]]</strong>，也称为 <strong>[[CD326]]</strong> 或 <strong>TROP1</strong>。它是一种广泛表达于各类上皮细胞基底外侧膜的跨膜糖蛋白。虽然名字中带有“黏附”二字，但 EPCAM 的功能早已超越了单纯的细胞间连接，它实际上是一个活跃的<strong>信号转导子</strong>，通过调节膜内蛋白水解（RIP）释放胞内结构域（EpICD），进入细胞核激活 <strong>[[Wnt信号通路]]</strong>，从而驱动细胞增殖和干性维持。在临床肿瘤学中，EPCAM 具有至高无上的地位：它是目前捕获和检测<strong>[[循环肿瘤细胞]] (CTC)</strong> 的“金标准”表面标志物；同时，EPCAM 基因 3' 端的缺失是导致<strong>[[林奇综合征]]</strong>的一种特殊机制（通过表观遗传沉默下游的 [[MSH2]]）；其功能缺失突变则会导致严重的儿科疾病——<strong>[[先天性簇绒肠病]] (CTE)</strong>。<br />
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<div style="font-size: 1.2em; font-weight: bold; letter-spacing: 1.2px;">EPCAM (CD326) · 基因档案</div><br />
<div style="font-size: 0.7em; opacity: 0.85; margin-top: 4px; white-space: nowrap;">Gene & Protein Profile (点击展开)</div><br />
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[[文件:EPCAM_Signaling_Cleavage.png|100px|EPCAM 裂解与信号转导]]<br />
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<div style="font-size: 0.8em; color: #64748b; margin-top: 12px; font-weight: 600;">泛上皮癌标志物 / 信号转导子</div><br />
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<th style="text-align: left; padding: 8px 12px; border-bottom: 1px solid #f1f5f9; color: #475569; background-color: #f8fafc; width: 40%;">基因符号</th><br />
<td style="padding: 8px 12px; border-bottom: 1px solid #f1f5f9; color: #0f172a;"><strong>EPCAM</strong></td><br />
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<th style="text-align: left; padding: 8px 12px; border-bottom: 1px solid #f1f5f9; color: #475569; background-color: #f8fafc;">常用别名</th><br />
<td style="padding: 8px 12px; border-bottom: 1px solid #f1f5f9; color: #0f172a;">CD326, TACSTD1, GA733-2</td><br />
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<th style="text-align: left; padding: 8px 12px; border-bottom: 1px solid #f1f5f9; color: #475569; background-color: #f8fafc;">染色体位置</th><br />
<td style="padding: 8px 12px; border-bottom: 1px solid #f1f5f9; color: #0f172a;">2p21</td><br />
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<th style="text-align: left; padding: 8px 12px; border-bottom: 1px solid #f1f5f9; color: #475569; background-color: #f8fafc;">Entrez ID</th><br />
<td style="padding: 8px 12px; border-bottom: 1px solid #f1f5f9; color: #1e40af;">4072</td><br />
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<th style="text-align: left; padding: 8px 12px; border-bottom: 1px solid #f1f5f9; color: #475569; background-color: #f8fafc;">HGNC ID</th><br />
<td style="padding: 8px 12px; border-bottom: 1px solid #f1f5f9; color: #1e40af;">11529</td><br />
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<th style="text-align: left; padding: 8px 12px; border-bottom: 1px solid #f1f5f9; color: #475569; background-color: #f8fafc;">UniProt</th><br />
<td style="padding: 8px 12px; border-bottom: 1px solid #f1f5f9; color: #1e40af;">P16422</td><br />
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<th style="text-align: left; padding: 8px 12px; border-bottom: 1px solid #f1f5f9; color: #475569; background-color: #f8fafc;">分子量</th><br />
<td style="padding: 8px 12px; border-bottom: 1px solid #f1f5f9; color: #0f172a;">~35-40 kDa</td><br />
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<th style="text-align: left; padding: 8px 12px; color: #475569; background-color: #f8fafc;">关键通路</th><br />
<td style="padding: 8px 12px; color: #0f172a;">RIP, Wnt/β-catenin</td><br />
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<h2 style="background: #f1f5f9; color: #0f172a; padding: 10px 18px; border-radius: 0 6px 6px 0; font-size: 1.25em; margin-top: 40px; border-left: 6px solid #0f172a; font-weight: bold;">分子机制：受控膜内蛋白水解 (RIP)</h2><br />
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EPCAM 的核心致癌机制类似于 Notch，涉及多步骤的蛋白酶切割和核转位。<br />
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<li style="margin-bottom: 12px;"><strong>粘附与抗粘附：</strong> EPCAM 既能介导同嗜性粘附（Homophilic adhesion），又能通过破坏经典钙黏蛋白（[[E-cadherin]]）与细胞骨架的连接，降低细胞间的紧密程度，这种“可塑性”有利于癌细胞的迁移和转移。</li><br />
<li style="margin-bottom: 12px;"><strong>RIP 激活级联：</strong><br />
<br>1. <strong>TACE/ADAM17 切割：</strong> 首先切除 EPCAM 的胞外结构域（EpEX）。<br />
<br>2. <strong>γ-分泌酶 (Presenilin-2) 切割：</strong> 随后释放短小的胞内结构域（<strong>EpICD</strong>）。<br />
<br>3. <strong>核转位：</strong> EpICD 与适配蛋白 [[FHL2]] 和 <strong>[[β-catenin]]</strong> 形成复合物，进入细胞核。<br />
<br>4. <strong>转录激活：</strong> 该复合物结合转录因子 [[LEF1]]，启动促增殖基因（如 <em>[[c-Myc]]</em>, <em>[[Cyclin D1]]</em>）的表达，从而维持[[肿瘤干细胞]] (CSC) 特性。</li><br />
<li style="margin-bottom: 12px;"><strong>Claudin-7 互作：</strong> EPCAM 常常与紧密连接蛋白 [[Claudin-7]] 形成复合物，这对于维持 EPCAM 的抗凋亡功能和基底膜稳定性至关重要。</li><br />
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<h2 style="background: #f1f5f9; color: #0f172a; padding: 10px 18px; border-radius: 0 6px 6px 0; font-size: 1.25em; margin-top: 40px; border-left: 6px solid #0f172a; font-weight: bold;">临床景观：从 CTC 捕获到遗传综合征</h2><br />
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EPCAM 是连接肿瘤诊断、遗传学和胃肠病学的重要分子。<br />
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<th style="padding: 12px; border: 1px solid #cbd5e1; color: #0f172a; width: 25%;">疾病/应用</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #475569;">变异/特征</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #1e40af;">临床意义</th><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[循环肿瘤细胞]] (CTC)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">高表达 (CD326+)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">EPCAM 是上皮来源癌细胞的通用标志物，而血液细胞不表达。FDA 批准的 <strong>CellSearch</strong> 系统利用磁珠偶联的抗 EpCAM 抗体从血液中富集 CTC，用于乳腺癌、前列腺癌和结直肠癌的预后评估。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[林奇综合征]] (Lynch)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">3'端缺失</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">EPCAM 基因位于错配修复基因 [[MSH2]] 的上游。EPCAM 基因末端的缺失会导致转录通读（Read-through），引起 MSH2 启动子的<strong>[[高度甲基化]]</strong>和沉默。这种不累及 MSH2 序列本身的突变被称为“EPCAM缺失型林奇综合征”。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[先天性簇绒肠病]] (CTE)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">功能缺失突变</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">一种罕见的常染色体隐性遗传病。EPCAM 突变导致肠上皮细胞间连接松散，形成特征性的“簇绒”状绒毛萎缩，导致新生儿严重的顽固性腹泻和营养吸收不良。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">实体瘤预后</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">过表达 (IHC 3+)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">在乳腺癌、头颈癌和胆囊癌中，EPCAM 高表达通常与干性增强（Stemness）、转移风险增加和不良预后相关。</td><br />
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作为最早被发现的肿瘤相关抗原之一（曾用名 17-1A），针对 EPCAM 的疗法经历了漫长的迭代。<br />
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<li style="margin-bottom: 12px;"><strong>单克隆抗体：</strong><br />
<br><strong>[[Edrecolomab]]</strong> (Panorex)：历史上第一个获批（德国，1995年）用于治疗结直肠癌的单抗，但因疗效有限后被撤市。<br />
<br><strong>Adecatumumab</strong>：具有较高亲和力的人源化抗体，正在探索中。</li><br />
<li style="margin-bottom: 12px;"><strong>双特异性抗体 (BsAbs)：</strong><br />
<br><strong>[[Catumaxomab]]</strong> (Removab)：靶向 EpCAM 和 CD3（T细胞）。曾获批用于治疗恶性[[腹水]]（EpCAM+ 肿瘤细胞在腹腔中），通过招募 T 细胞直接杀伤肿瘤。</li><br />
<li style="margin-bottom: 12px;"><strong>抗体偶联药物 (ADC)：</strong><br />
<br><strong>[[Oportuzumab monatox]]</strong> (Vicinium)：一种 EpCAM 抗体融合假单胞菌外毒素 A 的免疫毒素，用于治疗卡介苗无应答的非肌层浸润性[[膀胱癌]]，通过局部灌注给药以减少全身毒性。</li><br />
<li style="margin-bottom: 12px;"><strong>CAR-T 疗法：</strong><br />
<br>开发靶向 EpCAM 的 CAR-T 细胞用于治疗实体瘤。挑战在于 EpCAM 也表达于正常上皮（如胆管、肠道），容易引起严重的“在靶脱瘤”（On-target, off-tumor）毒性（如结肠炎、胆管炎），需严格控制亲和力。</li><br />
</ul><br />
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<h2 style="background: #f1f5f9; color: #0f172a; padding: 10px 18px; border-radius: 0 6px 6px 0; font-size: 1.25em; margin-top: 40px; border-left: 6px solid #0f172a; font-weight: bold;">关键关联概念</h2><br />
<ul style="padding-left: 25px; color: #334155;"><br />
<li style="margin-bottom: 12px;"><strong>[[循环肿瘤细胞]] (CTC)：</strong> EPCAM 是其捕获的基石。</li><br />
<li style="margin-bottom: 12px;"><strong>[[MSH2]]：</strong> 位于 EPCAM 下游，受 EPCAM 缺失影响而沉默。</li><br />
<li style="margin-bottom: 12px;"><strong>[[肿瘤干细胞]] (CSC)：</strong> EPCAM 是上皮性 CSC 的重要表面标志。</li><br />
<li style="margin-bottom: 12px;"><strong>[[Wnt信号通路]]：</strong> EpICD 激活的下游核心通路。</li><br />
<li style="margin-bottom: 12px;"><strong>[[Catumaxomab]]：</strong> 靶向 EpCAM 的双特异性抗体代表。</li><br />
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<span style="color: #0f172a; font-weight: bold; font-size: 1.05em; display: inline-block; margin-bottom: 15px;">学术参考文献与权威点评</span><br />
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<p style="margin: 12px 0; border-bottom: 1px solid #e2e8f0; padding-bottom: 10px;"><br />
[1] <strong>Herlyn M, et al. (1979).</strong> <em>Colorectal carcinoma-specific antigen: detection by means of monoclonal antibodies.</em> <strong>[[PNAS]]</strong>. <br><br />
<span style="color: #475569;">[学术点评]：发现之源。Wistar 研究所团队首次利用杂交瘤技术制备了抗 17-1A（即 EPCAM）的单克隆抗体，开创了肿瘤特异性抗原靶向治疗的先河。</span><br />
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<p style="margin: 12px 0; border-bottom: 1px solid #e2e8f0; padding-bottom: 10px;"><br />
[2] <strong>Ligtenberg MJ, et al. (2009).</strong> <em>Heritable somatic methylation and inactivation of MSH2 in families with Lynch syndrome due to deletion of the 3' exons of TACSTD1.</em> <strong>[[Nature Genetics]]</strong>. <br><br />
<span style="color: #475569;">[学术点评]：遗传学突破。首次揭示了 EPCAM 缺失导致 MSH2 表观遗传沉默的机制，将 EPCAM 正式纳入林奇综合征的致病基因列表，改变了遗传咨询的策略。</span><br />
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<p style="margin: 12px 0; border-bottom: 1px solid #e2e8f0; padding-bottom: 10px;"><br />
[3] <strong>Maetzel D, et al. (2009).</strong> <em>Nuclear signalling by tumour-associated antigen EpCAM.</em> <strong>[[Nature Cell Biology]]</strong>. <br><br />
<span style="color: #475569;">[学术点评]：机制里程碑。颠覆了 EPCAM 仅仅是“胶水”的认知，证明了 RIP 介导的 EpICD 核转位及其在 Wnt 信号通路中的转录激活作用，确立了其作为信号分子的地位。</span><br />
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<p style="margin: 12px 0; border-bottom: 1px solid #e2e8f0; padding-bottom: 10px;"><br />
[4] <strong>Sivagnanam M, et al. (2008).</strong> <em>Identification of EpCAM as the gene for congenital tufting enteropathy.</em> <strong>[[Gastroenterology]]</strong>. <br><br />
<span style="color: #475569;">[学术点评]：儿科罕见病。明确了 EPCAM 功能缺失是先天性簇绒肠病的病因，揭示了 EPCAM 在维持肠道上皮完整性中的关键生理作用。</span><br />
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<p style="margin: 12px 0;"><br />
[5] <strong>Riethdorf S, et al. (2007).</strong> <em>Detection of circulating tumor cells in peripheral blood of patients with metastatic breast cancer.</em> <strong>[[Clinical Cancer Research]]</strong>. <br><br />
<span style="color: #475569;">[学术点评]：CTC 应用。验证了基于 EpCAM 的 CellSearch 系统在乳腺癌 CTC 检测中的临床效用，确立了其作为预后生物标志物的地位。</span><br />
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<div style="background-color: #0f172a; color: #ffffff; text-align: center; font-weight: bold; padding: 10px; letter-spacing: 1px;">EPCAM · 知识图谱关联</div><br />
<div style="padding: 15px; background: #ffffff; line-height: 2.2; text-align: center; text-decoration: none;"><br />
[[循环肿瘤细胞]] • [[林奇综合征]] • [[MSH2]] • [[Wnt信号通路]] • [[Vicinium]] • [[Catumaxomab]] • [[簇绒肠病]] • [[上皮细胞]]<br />
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