查看“细胞毒性 T 细胞 (CTL)”的源代码

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            <strong>[[细胞毒性 T 细胞]] (Cytotoxic T Lymphocyte, CTL)</strong>，通常指 <strong>[[CD8+ T 细胞]]</strong>，是[[适应性免疫]]中负责直接杀伤靶细胞的“特种兵”。它们专门识别由 <strong>[[MHC-I]]</strong> 分子提呈的内源性抗原肽。一旦识别受病毒感染的细胞、胞内菌感染细胞或<strong>[[肿瘤细胞]]</strong>，CTL 会通过释放细胞毒性颗粒或启动死亡受体途径，精准地诱导靶细胞发生 <strong>[[细胞凋亡]]</strong>。由于 MHC-I 分子广泛分布于几乎所有有核细胞表面，CTL 构成了机体监控全身细胞健康状态的关键防线。
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            <div style="font-size: 1.25em; font-weight: bold; letter-spacing: 1.2px;">CTL (CD8+ T)</div>
            <div style="font-size: 0.7em; opacity: 0.85; margin-top: 4px; white-space: nowrap;">Cytotoxic T Cell · 核心摘要</div>
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                <div style="font-size: 0.8em; color: #64748b; margin-top: 12px; font-weight: 600;">核心任务：精准识别与直接杀伤</div>
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                    <th style="text-align: left; padding: 8px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0; width: 45%;">特异性标志物</th>
                    <td style="padding: 8px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">CD3+, CD8+</td>
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                    <th style="text-align: left; padding: 8px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">识别受体</th>
                    <td style="padding: 8px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;">TCR (αβ 型)</td>
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                    <th style="text-align: left; padding: 8px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">限制性分子</th>
                    <td style="padding: 8px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">MHC-I 类分子</td>
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                    <th style="text-align: left; padding: 8px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">主要杀伤介质</th>
                    <td style="padding: 8px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;">穿孔素, 颗粒酶, FasL</td>
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                    <th style="text-align: left; padding: 8px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">关键转录因子</th>
                    <td style="padding: 8px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">Eomes, T-bet, Blimp-1</td>
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                    <th style="text-align: left; padding: 8px 12px; background-color: #f1f5f9; color: #475569;">临床应用</th>
                    <td style="padding: 8px 12px; color: #1e40af;">肿瘤免疫治疗 (ICB), CAR-T</td>
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        CTL 杀伤靶细胞的过程具有高度的选择性和连续性。通过形成 <strong>[[免疫突触]]</strong>，CTL 确保毒性分子仅作用于目标细胞：
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        <li style="margin-bottom: 12px;"><strong>穿孔素-颗粒酶途径 (Perforin/Granzyme)：</strong> CTL 释放 <strong>[[穿孔素]]</strong> 在靶细胞膜上打孔，随后 <strong>[[颗粒酶 B]]</strong> 通过孔道进入靶细胞，直接激活 Caspase 级联反应或切割 Bid 诱导线粒体凋亡。</li>
        <li style="margin-bottom: 12px;"><strong>FasL-Fas 途径：</strong> 效应 CTL 表面高表达 <strong>[[FasL]]</strong> (CD95L)，与靶细胞上的死亡受体 Fas (CD95) 结合，启动外源性 <strong>[[细胞凋亡]]</strong> 途径。</li>
        <li style="margin-bottom: 12px;"><strong>细胞因子介导：</strong> 分泌 <strong>[[IFN-γ]]</strong> 和 <strong>[[TNF-α]]</strong>，增强靶细胞 MHC-I 表达，并协同诱导炎症坏死。</li>
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                <th style="padding: 12px; border: 1px solid #cbd5e1; color: #0f172a; width: 25%;">发育阶段</th>
                <th style="padding: 12px; border: 1px solid #cbd5e1; color: #475569;">关键特征</th>
                <th style="padding: 12px; border: 1px solid #cbd5e1; color: #1e40af;">生理任务</th>
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                <td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[初始 CD8+ T]]</td>
                <td style="padding: 10px; border: 1px solid #cbd5e1;">CCR7+, CD62L+, 静息态。</td>
                <td style="padding: 10px; border: 1px solid #cbd5e1;">在次级淋巴器官巡逻。</td>
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                <td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">激活与扩增</td>
                <td style="padding: 10px; border: 1px solid #cbd5e1;">需要 <strong>[[抗原识别]]</strong>、共刺激信号及 <strong>[[Th1 细胞]]</strong> 的辅助。</td>
                <td style="padding: 10px; border: 1px solid #cbd5e1; color: #1e40af;">发生剧烈的 <strong>[[克隆扩增]]</strong>。</td>
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                <td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">效应阶段 (CTL)</td>
                <td style="padding: 10px; border: 1px solid #cbd5e1;">获得细胞毒性颗粒。</td>
                <td style="padding: 10px; border: 1px solid #cbd5e1;">迁移至感染或肿瘤局部执行杀伤。</td>
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                <td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[记忆 CD8+ T]]</td>
                <td style="padding: 10px; border: 1px solid #cbd5e1;">长寿、依靠 <strong>[[IL-15]]</strong> 维持。</td>
                <td style="padding: 10px; border: 1px solid #cbd5e1; color: #1e40af;">提供 <strong>[[二次应答]]</strong> 保护。</td>
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        <li style="margin-bottom: 12px;"><strong>T 细胞耗竭 (Exhaustion)：</strong> 在慢性病毒感染或肿瘤微环境中，CTL 因持续受压而表达 <strong>[[PD-1]]</strong>、<strong>[[LAG-3]]</strong> 等抑制性受体，丧失杀伤功能。免疫检查点抑制剂旨在逆转此状态。</li>
        <li style="margin-bottom: 12px;"><strong>肿瘤逃逸：</strong> 肿瘤细胞可能下调 <strong>[[MHC-I]]</strong> 分子使其变为“不可见”，或分泌 <strong>[[TGF-β]]</strong> 抑制 CTL 活性。</li>
        <li style="margin-bottom: 12px;"><strong>CAR-T 疗法：</strong> 重点改造 CD8+ T 细胞，赋予其不依赖 MHC 的抗原识别能力，是目前血液肿瘤治疗的最前沿手段。</li>
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            <li style="margin-bottom: 8px;"><strong>[[交叉提呈]] (Cross-presentation)：</strong> 树突状细胞将外源抗原提呈给 CD8+ T 细胞的重要机制。</li>
            <li style="margin-bottom: 8px;"><strong>[[穿孔素]]：</strong> 杀伤过程中负责“破壁”的关键蛋白。</li>
            <li style="margin-bottom: 8px;"><strong>[[免疫记忆建立]]：</strong> CTL 扩增后如何留下长效守卫部队的过程。</li>
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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 [Academic Review]</span>
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            [1] <strong>Barry M, Bleackley RC. (2002).</strong> <em>Cytotoxic T lymphocytes: all roads lead to death.</em> <strong>[[Nature Reviews Immunology]]</strong>.<br>
            [2] <strong>Wherry EJ, et al. (2015).</strong> <em>Molecular signature of CD8+ T cell exhaustion.</em> <strong>[[Nature Immunology]]</strong>.
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            细胞毒性 T 细胞 · 知识图谱
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                <td style="width: 110px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle; white-space: nowrap;">启动信号</td>
                <td style="padding: 10px 15px; color: #334155;">[[MHC-I/肽]]•[[CD8 共受体]]•[[IL-2 (来自 Th1)]]</td>
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                <td style="width: 110px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle; white-space: nowrap;">效应通路</td>
                <td style="padding: 10px 15px; color: #334155;">[[颗粒酶释放]]•[[穿孔素打孔]]•[[Fas 介导凋亡]]</td>
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                <td style="width: 110px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle; white-space: nowrap;">调控分子</td>
                <td style="padding: 10px 15px; color: #334155;">[[PD-1]]•[[CTLA-4]]•[[IFN-γ]]•[[IL-15]]</td>
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