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外排泵 - 版本历史
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<p>建立内容为“<div style="border: 1px solid #d1d5db; padding: 25px; font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', Arial, sans-serif; color: #334155; line-height: 1.8…”的新页面</p>
<p><b>新页面</b></p><div><div style="border: 1px solid #d1d5db; padding: 25px; font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', Arial, sans-serif; color: #334155; line-height: 1.8; max-width: 1000px; margin: auto; background-color: #ffffff;"><br />
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<h1 style="margin: 0; color: #1e40af; font-size: 28px;">外排泵 (Efflux Pumps)</h1><br />
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<strong>外排泵</strong>（Efflux Pumps）是一类跨膜转运蛋白，广泛存在于原核生物与真核生物中。其核心功能是通过消耗能量（如 ATP 水解或质子梯度驱动），将胞内底物（包括代谢产物、信号分子以及外源性毒素、抗生素和化疗药物）泵出胞外。在临床医学领域，外排泵的过表达是导致<strong>多药耐药性（Multi-Drug Resistance, MDR）</strong>的主要机制之一。例如，人源性的 ABC 转运蛋白超家族（如 P-gp）能显著降低肿瘤细胞内化疗药物的有效浓度，从而导致治疗失败。<br />
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<div style="font-size: 1.2em; font-weight: bold; letter-spacing: 1.2px;">外排泵 / MDR 蛋白</div><br />
<div style="font-size: 0.75em; opacity: 0.85; margin-top: 4px;">Transmembrane Efflux Systems</div><br />
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<div style="font-size: 0.75em; color: #64748b; margin-top: 10px; font-weight: 600;">ABC 转运蛋白三维结构模型</div><br />
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<tr style="border-bottom: 1px solid #e2e8f0;"><th style="padding: 8px; text-align: left; background-color: #f8fafc; color: #475569; width: 40%;">主要超家族</th><td style="padding: 8px; color: #0f172a;">ABC, RND, MFS</td></tr><br />
<tr style="border-bottom: 1px solid #e2e8f0;"><th style="padding: 8px; text-align: left; background-color: #f8fafc; color: #475569;">Entrez Gene</th><td style="padding: 8px; color: #0f172a;">5243 (ABCB1)</td></tr><br />
<tr style="border-bottom: 1px solid #e2e8f0;"><th style="padding: 8px; text-align: left; background-color: #f8fafc; color: #475569;">UniProt</th><td style="padding: 8px; color: #0f172a;">P08183 (P-gp)</td></tr><br />
<tr style="border-bottom: 1px solid #e2e8f0;"><th style="padding: 8px; text-align: left; background-color: #f8fafc; color: #475569;">Molecular Weight</th><td style="padding: 8px; color: #0f172a;">$\approx 170\ kDa$</td></tr><br />
<tr style="border-bottom: 1px solid #e2e8f0;"><th style="padding: 8px; text-align: left; background-color: #f8fafc; color: #475569;">动力来源</th><td style="padding: 8px; color: #b91c1c; font-weight: bold;">ATP / $H^+$ 梯度</td></tr><br />
<tr><th style="padding: 8px; text-align: left; background-color: #f8fafc; color: #475569;">功能分类</th><td style="padding: 8px; color: #0f172a;">主动转运蛋白</td></tr><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: 10px; border-left: 6px solid #1e40af; font-weight: bold;">分子机制 (Mechanism of Action)</h2><br />
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外排泵（以典型的 ABC 超家族为例）的操作逻辑类似于一个精密的“机械泵”，通常包含两个高度保守的结构域：<br />
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<li style="margin-bottom: 12px;"><strong>跨膜结构域 (TMDs)：</strong> 由多个 $\alpha$-螺旋组成，形成底物结合口袋。TMDs 的灵活性决定了泵对不同分子结构底物的识别范围。</li><br />
<li style="margin-bottom: 12px;"><strong>核苷酸结合结构域 (NBDs)：</strong> 位于胞质侧，含有 ATP 结合及水解位点。</li><br />
<li style="margin-bottom: 12px;"><strong>转运循环：</strong> <br />
<br>1. 底物进入 TMDs 的内向开口口袋。<br />
<br>2. ATP 结合至 NBDs，诱导蛋白构象从“内向开放”切换为“外向开放”。<br />
<br>3. 底物被排挤至胞外，随后 ATP 水解，蛋白恢复初始构象。<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 #1e40af; font-weight: bold;">关键外排泵及其临床意义</h2><br />
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<th style="padding: 12px; border: 1px solid #e2e8f0;">外排泵名称</th><br />
<th style="padding: 12px; border: 1px solid #e2e8f0;">代表基因</th><br />
<th style="padding: 12px; border: 1px solid #e2e8f0;">主要转运底物 (药物)</th><br />
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<td style="padding: 12px; border: 1px solid #e2e8f0;"><strong>P-gp (P-糖蛋白)</strong></td><br />
<td style="padding: 12px; border: 1px solid #e2e8f0;"><i>ABCB1 (MDR1)</i></td><br />
<td style="padding: 12px; border: 1px solid #e2e8f0;">紫杉醇、阿霉素、长春新碱、地高辛</td><br />
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<td style="padding: 12px; border: 1px solid #e2e8f0;"><strong>MRP1</strong></td><br />
<td style="padding: 12px; border: 1px solid #e2e8f0;"><i>ABCC1</i></td><br />
<td style="padding: 12px; border: 1px solid #e2e8f0;">谷胱甘肽结合物、氨甲蝶呤、依托泊苷</td><br />
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<td style="padding: 12px; border: 1px solid #e2e8f0;"><strong>BCRP</strong></td><br />
<td style="padding: 12px; border: 1px solid #e2e8f0;"><i>ABCG2</i></td><br />
<td style="padding: 12px; border: 1px solid #e2e8f0;">米托蒽醌、伊立替康、吉非替尼</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 #1e40af; font-weight: bold;">逆转策略 (Therapeutic Strategies)</h2><br />
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针对外排泵引起的耐药问题，临床与科研界已开发多代逆转方案：<br />
<br>1. <strong>第一/二代抑制剂：</strong> 如维拉帕米、环孢素 A，虽能抑制 P-gp，但因亲和力低且全身毒性大而受限。<br />
<br>2. <strong>第三代高效抑制剂：</strong> 如 <strong>Tariquidar</strong>，具有极高的特异性和较低的副作用，正处于临床验证阶段。<br />
<br>3. <strong>纳米载体技术：</strong> 通过封装化疗药物，使其绕过跨膜蛋白的识别直接通过胞吞进入胞内，从而“规避”外排泵的抽提。<br />
<br>4. <strong>基因沉默：</strong> 利用 siRNA 或 CRISPR 技术直接下调 <i>ABCB1</i> 等基因的表达。<br />
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<h4 style="margin: 0 0 15px 0; color: #1e40af; font-size: 1.1em;">关键相关概念 (Key Concepts)</h4><br />
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<span style="background: #e0f2fe; padding: 5px 12px; border-radius: 20px;">● <strong>MDR (Multi-Drug Resistance)</strong></span><br />
<span style="background: #e0f2fe; padding: 5px 12px; border-radius: 20px;">● <strong>ABC Superfamily</strong></span><br />
<span style="background: #e0f2fe; padding: 5px 12px; border-radius: 20px;">● <strong>Active Transport</strong></span><br />
<span style="background: #e0f2fe; padding: 5px 12px; border-radius: 20px;">● <strong>Substrate Specificity</strong></span><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 #1e40af; font-weight: bold;">参考文献</h2><br />
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[1] <strong>[Academic Review]</strong> Robey RW, et al. (2018). <em>ABC transporters: signalling the cellular fate of cytotoxic drugs and beyond.</em> <strong>Nature Reviews Cancer</strong>. 18(7):452-464.<br />
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[2] <strong>Gottesman MM, et al. (2002).</strong> <em>Multidrug resistance in cancer: role of ATP-binding cassette transporters.</em> <strong>Nature Reviews Cancer</strong>. 2(1):48-58.<br />
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[3] <strong>Li W, et al. (2016).</strong> <em>Efflux pump inhibitors in drug resistance.</em> <strong>Molecules</strong>. 21(12):1676.<br />
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<div style="font-weight: bold;">外排泵 · 知识图谱</div><br />
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<span style="cursor: pointer; opacity: 0.9;">分类与分科</span><br />
<span style="cursor: pointer; opacity: 0.9;">底物数据库</span><br />
<span style="cursor: pointer; opacity: 0.9;">抑制剂研发</span><br />
<span style="cursor: pointer; opacity: 0.9;">耐药机制</span><br />
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