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LBP - 版本历史
2026-04-09T20:49:44Z
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2026年2月3日 (二) 23:29 77921020
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<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 10px 15px; color: #334155;">LPS <del class="diffchange diffchange-inline">$\rightarrow$ </del><strong>LBP</strong> <del class="diffchange diffchange-inline">$\rightarrow$ </del>[[CD14]] <del class="diffchange diffchange-inline">$\rightarrow$ </del>[[TLR4]]/MD-2</td></div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 10px 15px; color: #334155;">LPS <ins class="diffchange diffchange-inline">&rarr; </ins><strong>LBP</strong> <ins class="diffchange diffchange-inline">&rarr; </ins>[[CD14]] <ins class="diffchange diffchange-inline">&rarr; </ins>[[TLR4]]/MD-2</td></div></td></tr>
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2026-02-03T23:27:12Z
<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>LPS结合蛋白</strong>（LPS-Binding Protein，<strong>LBP</strong>）是一种主要由肝脏合成并分泌到血液中的 <strong>[[急性期蛋白]]</strong>。作为机体探测革兰氏阴性菌感染的“雷达信号放大器”，LBP 能够特异性地结合细菌细胞壁成分 <strong>[[脂多糖]] (LPS)</strong>。它的核心功能是将疏水的、聚集成团的 LPS 分子从细菌膜或胶束中“萃取”出来，并以单体形式高效传递给下游的受体复合物（主要是 <strong>[[CD14]]</strong>），从而极大地降低了免疫系统识别内毒素的阈值（可达 100-1000 倍）。此外，LBP 还具有双重免疫调节功能：既能促进炎症启动，也能在内毒素过量时协助将其转移至 <strong>[[高密度脂蛋白]] (HDL)</strong> 进行中和与清除。<br />
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<div style="font-size: 1.2em; font-weight: bold; letter-spacing: 1.2px;">LPS结合蛋白</div><br />
<div style="font-size: 0.7em; opacity: 0.85; margin-top: 4px; white-space: nowrap;">LPS-Binding Protein (点击展开)</div><br />
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<div style="font-size: 0.8em; color: #64748b; margin-top: 12px; font-weight: 600;">内毒素的“摆渡人”</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;">基本信息</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%;">基因符号</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;"><em>LBP</em></td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">染色体位置</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;">20q11.23 (Human)</td><br />
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<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #16a34a;">肝细胞 (Hepatocytes)</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">分子量</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">~60 kDa (糖基化)</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;">功能属性</th><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">蛋白家族</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;">BPI/LBP/PLTP 家族</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">结合对象</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">LPS (Lipid A 部分)</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">下游受体</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #e11d48;">[[CD14]]</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569;">临床指标</th><br />
<td style="padding: 6px 12px; color: #1e40af;">脓毒症辅助诊断</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;">核心机制：疏水脂质的搬运工</h2><br />
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LPS（内毒素）是一种两亲性分子，在血液这种水性环境中，它们倾向于聚集成巨大的、生物活性较低的<strong>胶束 (Micelles)</strong> 或囊泡结构。LBP 的作用类似于一个分子“镊子”，打破这种聚集。<br />
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<li style="margin-bottom: 8px;"><strong>萃取 (Extraction)：</strong> LBP 的 N-端结构域结合 LPS 的 Lipid A 尾部，将其从细菌外膜或聚集的胶束中“拉”出来，形成 LBP-LPS 单体复合物。</li><br />
<li style="margin-bottom: 8px;"><strong>递送 (Delivery)：</strong> LBP 随后通过 C-端结构域与细胞膜上的 <strong>[[CD14]]</strong> 相互作用，将 LPS 分子“倒手”交给 CD14。</li><br />
<li style="margin-bottom: 8px;"><strong>催化循环：</strong> LBP 在这个过程中充当酶样的催化剂。一个 LBP 分子可以连续搬运多个 LPS 分子，这就是为何极低浓度的 LBP 就能显著放大免疫反应的原因。</li><br />
<li style="margin-bottom: 0;"><strong>结构同源性：</strong> LBP 与中性粒细胞颗粒蛋白 <strong>[[BPI]]</strong> (杀菌/通透性增加蛋白) 高度同源。但有趣的是，BPI 结合 LPS 后通常会中和其毒性，而 LBP 则是呈递其毒性（在生理浓度下）。</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;">双刃剑：促炎与抗炎的双重角色</h2><br />
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LBP 在体内的功能表现出独特的<strong>浓度依赖性</strong>和<strong>环境依赖性</strong>，这在脓毒症的病理生理学中尤为关键。<br />
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<th style="padding: 12px; border: 1px solid #cbd5e1; color: #0f172a; width: 20%;">生理状态</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #1e40af; width: 30%;">LBP 浓度</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #475569; width: 50%;">功能效应</th><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">健康/早期感染</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">低浓度 (5-10 µg/mL)</td><br />
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<strong>促炎 (Pro-inflammatory)：</strong><br><br />
高效将 LPS 呈递给 CD14/TLR4 复合物，迅速激活免疫系统，警示细菌入侵。<br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">急性期反应 (APR)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">急剧升高 (可达 200 µg/mL)</td><br />
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<strong>抗炎/解毒 (Anti-inflammatory)：</strong><br><br />
高浓度的 LBP 倾向于将 LPS 转移给 <strong>[[HDL]]</strong> 或 <strong>[[LDL]]</strong>，而非 CD14。脂蛋白结合 LPS 后将其运送至肝脏清除，从而防止过度的炎症风暴。<br />
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<li style="margin-bottom: 12px;"><strong>生物标志物：</strong> 由于 LBP 是一种急性期蛋白，其血清水平在感染后 24 小时内显著上升。虽然不如 [[降钙素原]] (PCT) 或 [[CRP]] 常用，但在鉴别革兰氏阴性菌感染引起的脓毒症中具有一定的特异性价值。</li><br />
<li style="margin-bottom: 12px;"><strong>肠道屏障功能：</strong> 在非感染性疾病（如 HIV、肝硬化）中，血浆 LBP 升高常被用作<strong>细菌移位 (Microbial Translocation)</strong> 和肠漏 (Leaky Gut) 的替代指标。</li><br />
<li style="margin-bottom: 12px;"><strong>基因多态性：</strong> <em>LBP</em> 基因的特定 [[单核苷酸多态性]] (SNPs) 与个体对脓毒症的易感性及预后相关。</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 [Academic Review]</span><br />
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[1] <strong>Schumann RR, et al. (1990).</strong> <em>Structure and function of lipopolysaccharide binding protein.</em> <strong>[[Science]]</strong>. <br><br />
<span style="color: #475569;">[点评]：LBP 的开创性研究，首次克隆并纯化了 LBP，证明它是增强 LPS 诱导单核细胞活化的血清因子。</span><br />
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[2] <strong>Tobias PS, et al. (1995).</strong> <em>Lipopolysaccharide binding protein-mediated complexation of lipopolysaccharide with soluble CD14.</em> <strong>[[Journal of Biological Chemistry]]</strong>. <br><br />
<span style="color: #475569;">[点评]：详细阐明了 LBP 催化 LPS 转移至 CD14 的分子动力学机制，确立了“LPS-LBP-CD14”轴。</span><br />
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[3] <strong>Opal SM, et al. (1999).</strong> <em>Relationship between plasma levels of lipopolysaccharide-binding protein, endotoxin, and severity of illness in patients with severe sepsis.</em> <strong>[[Journal of Infectious Diseases]]</strong>. <br><br />
<span style="color: #475569;">[点评]：临床经典研究，分析了 LBP 水平与脓毒症患者预后的关系，揭示了其作为急性期反应物的临床特征。</span><br />
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先天免疫识别 · 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;">上级分类</td><br />
<td style="padding: 10px 15px; color: #334155;">[[急性期蛋白]] • 脂质转移蛋白</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;">核心通路</td><br />
<td style="padding: 10px 15px; color: #334155;">LPS $\rightarrow$ <strong>LBP</strong> $\rightarrow$ [[CD14]] $\rightarrow$ [[TLR4]]/MD-2</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;">相关蛋白</td><br />
<td style="padding: 10px 15px; color: #334155;">[[BPI]] (拮抗) • [[HDL]] (清除) • [[CRP]]</td><br />
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