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NLRP3炎症小体 - 版本历史
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<strong>NLRP3炎症小体</strong>（NLRP3 Inflammasome）是 <strong>[[固有免疫]]</strong> 系统中最为复杂、研究最热点的一种多蛋白复合物。作为一种细胞内的“危险传感器”，它不仅能识别外源性的 <strong>[[PAMPs]]</strong>（如细菌毒素），更能敏锐地感知内源性的 <strong>[[DAMPs]]</strong>（如 <strong>[[尿酸]]</strong> 结晶、胞外 ATP、β-淀粉样蛋白），是无菌性炎症（Sterile Inflammation）的核心驱动力。一旦激活，NLRP3 会招募接头蛋白 <strong>[[ASC]]</strong> 和效应蛋白 <strong>[[Caspase-1]]</strong>，导致炎症因子（IL-1β, IL-18）的成熟与释放，并诱导一种炎症性的细胞死亡——<strong>[[细胞焦亡]] (Pyroptosis)</strong>。<br />
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<div style="font-size: 1.2em; font-weight: bold; letter-spacing: 1.2px;">NLRP3炎症小体</div><br />
<div style="font-size: 0.7em; opacity: 0.85; margin-top: 4px; white-space: nowrap;">细胞内的危险传感器 (点击展开)</div><br />
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<div style="font-size: 0.8em; color: #64748b; margin-top: 12px; font-weight: 600;">无菌性炎症的总开关</div><br />
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<th colspan="2" style="padding: 8px 12px; background-color: #e0f2fe; color: #1e40af; text-align: left; font-size: 0.9em; border-top: 1px solid #bae6fd;">复合物组分</th><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0; width: 40%;">传感器</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">[[NLRP3]] (Cryopyrin)</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">接头蛋白</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;">[[ASC]] (含CARD域)</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">效应酶</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #16a34a;">[[Caspase-1]]</td><br />
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<th colspan="2" style="padding: 8px 12px; background-color: #e0f2fe; color: #1e40af; text-align: left; font-size: 0.9em; border-top: 1px solid #bae6fd;">激活与效应</th><br />
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<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;">钾离子外流 (K+ Efflux)</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">主要产物</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">IL-1β, IL-18</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">死亡方式</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #e11d48;">[[细胞焦亡]]</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569;">相关疾病</th><br />
<td style="padding: 6px 12px; color: #0f172a;">[[痛风]], 糖尿病, AD</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;">激活机制：双信号模型</h2><br />
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为了防止这一强力的炎症武器误发，细胞设置了严格的“双重保险”激活机制。<br />
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<li style="margin-bottom: 8px;"><strong>信号 1 (Priming/预激)：</strong> <br />
<br><em>触发者：</em>[[TLR4]] 等受体识别 LPS。<br />
<br><em>效应：</em>激活 <strong>[[NF-κB通路]]</strong>，上调 NLRP3 蛋白和 Pro-IL-1β（前体）的表达。此时“子弹已上膛”，但尚未击发。</li><br />
<li style="margin-bottom: 8px;"><strong>信号 2 (Activation/激活)：</strong><br />
<br><em>触发者：</em>ATP、尿酸结晶、溶酶体破裂、成孔毒素。<br />
<br><em>核心事件：</em>上述刺激通常汇聚为<strong>钾离子外流 (K+ Efflux)</strong>。胞内低钾环境促使 NLRP3 发生寡聚化，招募 ASC 和 Caspase-1 组装成炎症小体。</li><br />
<li style="margin-bottom: 0;"><strong>结果：</strong> 活化的 Caspase-1 像剪刀一样，将 Pro-IL-1β 剪切为成熟的 <strong>[[IL-1β]]</strong>。</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;">下游效应：Gasdermin D 与 焦亡</h2><br />
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除了加工细胞因子，NLRP3 炎症小体的另一个标志性功能是诱导<strong>[[细胞焦亡]] (Pyroptosis)</strong>。<br />
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<li style="margin-bottom: 12px;"><strong>打孔蛋白 GSDMD：</strong> 活化的 Caspase-1 会切割底物 <strong>[[Gasdermin D]] (GSDMD)</strong>，释放其 N 端结构域 (GSDMD-N)。</li><br />
<li style="margin-bottom: 12px;"><strong>膜穿孔：</strong> GSDMD-N 转移到细胞膜上聚合形成纳米孔洞。</li><br />
<li style="margin-bottom: 12px;"><strong>细胞爆炸：</strong> IL-1β 通过这些孔洞释放到胞外；随后水分内流，导致细胞肿胀破裂，释放大量炎症物质，引发强烈的炎症反应。</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;">临床意义：富贵病的根源</h2><br />
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NLRP3 是许多现代代谢性疾病和老年病的罪魁祸首，因为它能识别代谢废物。<br />
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<th style="padding: 12px; border: 1px solid #cbd5e1; color: #0f172a; width: 25%;">疾病</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #1e40af; width: 30%;">刺激因子 (DAMPs)</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #475569; width: 45%;">机制</th><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[痛风]] (Gout)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">尿酸盐结晶 (MSU)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">巨噬细胞吞噬晶体 $\rightarrow$ 溶酶体破裂 $\rightarrow$ NLRP3 激活。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">2型糖尿病</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">胰岛淀粉样多肽 (IAPP)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">IAPP 沉积激活 NLRP3，导致胰岛 $\beta$ 细胞死亡和胰岛素抵抗。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">动脉粥样硬化</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">胆固醇结晶</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">血管壁巨噬细胞吞噬胆固醇后激活 NLRP3，形成泡沫细胞。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">CAPS 综合征</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">基因突变</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">NLRP3 基因发生功能获得性突变，导致自身持续活化。</td><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 [Academic Review]</span><br />
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[1] <strong>Martinon F, Burns K, Tschopp J. (2002).</strong> <em>The inflammasome: a molecular platform triggering activation of inflammatory caspases and processing of proIL-beta.</em> <strong>[[Molecular Cell]]</strong>. <br><br />
<span style="color: #475569;">[点评]：Jürg Tschopp 团队的奠基之作，首次定义了“炎症小体”这一概念和分子机器。</span><br />
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[2] <strong>Martinon F, Pétrilli V, Mayor A, Tardivel A, Tschopp J. (2006).</strong> <em>Gout-associated uric acid crystals activate the NALP3 inflammasome.</em> <strong>[[Nature]]</strong>. <br><br />
<span style="color: #475569;">[点评]：揭示了痛风的分子机制，证明尿酸结晶是 NLRP3 的激活剂，将代谢产物与固有免疫直接联系起来。</span><br />
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[3] <strong>Shi J, et al. (2015).</strong> <em>Cleavage of GSDMD by inflammatory caspases determines pyroptosis.</em> <strong>[[Nature]]</strong>. <br><br />
<span style="color: #475569;">[点评]：邵峰院士团队的突破性发现，鉴定了 GSDMD 是细胞焦亡的执行蛋白，解开了炎性坏死之谜。</span><br />
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NLRP3 炎症小体网络 · 知识图谱<br />
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<td style="width: 85px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">上级系统</td><br />
<td style="padding: 10px 15px; color: #334155;">[[炎症小体]] • [[固有免疫]] • [[NOD样受体]] (NLRs)</td><br />
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<td style="width: 85px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">核心刺激</td><br />
<td style="padding: 10px 15px; color: #334155;">[[ATP]] • [[尿酸]] • [[铝佐剂]] • 病毒RNA</td><br />
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<td style="width: 85px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">关键产物</td><br />
<td style="padding: 10px 15px; color: #334155;">[[IL-1β]] (致热原) • [[IL-18]] • [[GSDMD-N]] (焦亡)</td><br />
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