查看“EC50”的源代码

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            <strong>EC<sub>50</sub></strong>（Half Maximal Effective Concentration，半最大效应浓度）是 <strong>[[Pharmacodynamics]] (药效学)</strong> 中用于衡量药物<strong>[[Potency]] (效价强度)</strong> 的核心指标。它指的是能引起 50% <strong>[[Emax]] (最大效应)</strong> 时所需的药物浓度（通常为摩尔浓度）。EC<sub>50</sub> 与药物的效价呈<strong>反比关系</strong>：EC<sub>50</sub> 数值越小，说明达到同等效应所需的药物浓度越低，即药物的效价越高。它是绘制 <strong>[[Dose-Response Curve]] (量效曲线)</strong> 时的关键参数，常用于比较不同激动剂（Agonist）对同一受体的亲和力与活性。
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            <div style="font-size: 1.2em; font-weight: bold; letter-spacing: 1.2px;">EC<sub>50</sub></div>
            <div style="font-size: 0.7em; opacity: 0.85; margin-top: 4px; white-space: nowrap;">Potency Indicator (点击展开)</div>
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                <div style="font-size: 0.8em; color: #64748b; margin-top: 12px; font-weight: 600;">S型曲线的中心点</div>
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                    <th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0; width: 40%;">全称</th>
                    <td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">Half maximal effective concentration</td>
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                    <th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">所属学科</th>
                    <td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;">[[Pharmacodynamics]]</td>
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                    <th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">常用单位</th>
                    <td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">Molar (nM, &#181;M)</td>
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                    <th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">衡量指标</th>
                    <td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #16a34a;">[[Potency]] (效价)</td>
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                    <th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">曲线特征</th>
                    <td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">拐点 (Inflection Point)</td>
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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;">相关概念</th>
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                    <th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">抑制剂对应</th>
                    <td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #e11d48;">[[IC50]]</td>
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                    <th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">活体对应</th>
                    <td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">[[ED50]] (剂量)</td>
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                    <th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">结合常数</th>
                    <td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">[[Kd]]</td>
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                    <th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569;">数学模型</th>
                    <td style="padding: 6px 12px; color: #1e40af;">[[Hill Equation]]</td>
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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;">定义解析：效价的标尺</h2>
    
    <p style="margin: 15px 0; text-align: justify;">
        在药理学实验中，当药物浓度以对数标度 (Log scale) 作图时，量效曲线通常呈现“S”形 (Sigmoidal)。EC<sub>50</sub> 位于这条曲线最陡峭部分的中心点。
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        <h3 style="margin-top: 0; color: #1e40af; font-size: 1.1em;">越低越强 (Lower is Better)</h3>
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            EC<sub>50</sub> 与效价 (Potency) 成反比。
            <br>● <strong>药物 A (EC<sub>50</sub> = 1 nM)</strong> 比 <strong>药物 B (EC<sub>50</sub> = 100 nM)</strong> 效价高 100 倍。
            <br>这意味着达到同样的治疗效果，药物 A 仅需药物 B 百分之一的浓度。
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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;">数学模型：Hill 方程</h2>
    
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        EC<sub>50</sub> 是经典的 <strong>Hill 方程</strong> 中的核心参数，该方程描述了药物浓度 (<i>C</i>) 与效应 (<i>E</i>) 之间的定量关系：
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        E = (E<sub>max</sub> × C<sup>n</sup>) / (EC<sub>50</sub><sup>n</sup> + C<sup>n</sup>)
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        <li style="margin-bottom: 8px;"><strong>E<sub>max</sub>：</strong> 最大效应（效能）。</li>
        <li style="margin-bottom: 8px;"><strong>EC<sub>50</sub>：</strong> 引起 50% E<sub>max</sub> 的浓度。</li>
        <li style="margin-bottom: 8px;"><strong>n (Hill Coefficient)：</strong> 希尔系数，反映曲线的斜率或药物与受体结合的协同性。</li>
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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;">概念辨析：EC50 vs. IC50 vs. ED50</h2>
    
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        药理学中有多个带“50”后缀的参数，它们极易混淆，但应用场景截然不同：
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                <th style="padding: 12px; border: 1px solid #cbd5e1; color: #0f172a; width: 15%;">参数</th>
                <th style="padding: 12px; border: 1px solid #cbd5e1; color: #1e40af; width: 25%;">全称</th>
                <th style="padding: 12px; border: 1px solid #cbd5e1; color: #475569; width: 60%;">定义与用途</th>
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                <td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;"><strong>EC<sub>50</sub></strong></td>
                <td style="padding: 10px; border: 1px solid #cbd5e1;">Effective Conc.</td>
                <td style="padding: 10px; border: 1px solid #cbd5e1;"><strong>激动剂</strong>的半最大效应浓度。用于体外实验 (In Vitro)。</td>
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                <td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;"><strong>[[IC50]]</strong></td>
                <td style="padding: 10px; border: 1px solid #cbd5e1;">Inhibitory Conc.</td>
                <td style="padding: 10px; border: 1px solid #cbd5e1;"><strong>拮抗剂</strong>的半最大抑制浓度。用于衡量阻断剂或抑制剂的效能。</td>
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                <td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;"><strong>[[ED50]]</strong></td>
                <td style="padding: 10px; border: 1px solid #cbd5e1;">Effective Dose</td>
                <td style="padding: 10px; border: 1px solid #cbd5e1;">半数有效<strong>剂量</strong> (如 mg/kg)。用于动物或人体实验 (In Vivo)，指让 50% 个体产生效应的剂量。</td>
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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>Neubig RR, et al. (2003).</strong> <em>International Union of Pharmacology Committee on Receptor Nomenclature and Drug Classification. XXXVIII. Update on terms and symbols in quantitative pharmacology.</em> <strong>[[Pharmacological Reviews]]</strong>. <br>
            <span style="color: #475569;">[点评]：IUPHAR 发布的权威指南，标准化了 EC<sub>50</sub>、IC<sub>50</sub> 等术语的定义，是药理学界的命名法典。</span>
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            [2] <strong>Holford NH, Sheiner LB. (1981).</strong> <em>Understanding the dose-effect relationship: clinical application of pharmacokinetic-pharmacodynamic models.</em> <strong>[[Clinical Pharmacokinetics]]</strong>. <br>
            <span style="color: #475569;">[点评]：经典文献，阐述了如何利用 EC<sub>50</sub> 参数将 PK 与 PD 联系起来，以优化临床给药方案。</span>
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            [3] <strong>Kenakin T. (2014).</strong> <em>A Pharmacology Primer: Theory, Applications, and Methods.</em> <strong>[[Elsevier]]</strong>. <br>
            <span style="color: #475569;">[点评]：药理学经典教材，详细推导了 Hill 方程，并解释了 Potency 和 Efficacy 在药物筛选中的区别。</span>
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            药效学参数 · 知识图谱
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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;">上级概念</td>
                <td style="padding: 10px 15px; color: #334155;">[[Pharmacodynamics]] • [[Dose-Response Relationship]]</td>
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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;">平行指标</td>
                <td style="padding: 10px 15px; color: #334155;">[[IC50]] (抑制) • [[ED50]] (剂量) • [[Kd]] (亲和力)</td>
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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;">核心应用</td>
                <td style="padding: 10px 15px; color: #334155;">[[Potency]] (效价) • [[Efficacy]] (效能) • [[Drug Screening]]</td>
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