组胺
<p style=" language: zh-CN; margin-top: 0pt; margin-bottom: 0pt; text-align: left; direction: ltr; unicode-bidi: embed; vertical-align: baseline;"><span style=" font-size: 28.0pt; font-family: 'Times New Roman'; mso-ascii-font-family: Times New Roman; mso-fareast-font-family: 华文楷体; mso-bidi-font-family: +mn-cs; mso-bidi-theme-font: minor-bidi; color: #00007D; mso-color-index: 2; mso-font-kerning: 12.0pt; language: en-US; text-combine: letters; font-weight: bold; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: background2; mso-style-textfill-fill-color: #00007D; mso-style-textfill-fill-alpha: 100.0%;">2</span><span style=" font-size: 28.0pt; font-family: 华文楷体; mso-ascii-font-family: Times New Roman; mso-fareast-font-family: 华文楷体; mso-bidi-font-family: +mn-cs; mso-bidi-theme-font: minor-bidi; color: #00007D; mso-color-index: 2; mso-font-kerning: 12.0pt; language: zh-CN; text-combine: letters; font-weight: bold; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: background2; mso-style-textfill-fill-color: #00007D; mso-style-textfill-fill-alpha: 100.0%;">．组氨酸经组氨酸脱羧酶催化脱羧生成组胺</span>
<img src="/5e92ed0e-4ec2-5fa5-846c-a78c907a516e.png"/></p>
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<span style=" font-size: 18.0pt; font-family: 'Times New Roman'; mso-ascii-font-family: Times New Roman; mso-fareast-font-family: 宋体; mso-bidi-font-family: +mn-cs; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: zh-CN; text-combine: letters; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;"><span style=" mso-spacerun: yes;"> </span>当机体接触过敏原后会产生一种</span><span style=" font-size: 18.0pt; font-family: 'Times New Roman'; mso-ascii-font-family: Times New Roman; mso-fareast-font-family: 宋体; mso-bidi-font-family: +mn-cs; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; text-combine: letters; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;">IgE</span><span style=" font-size: 18.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-fareast-font-family: 宋体; mso-bidi-font-family: +mn-cs; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: zh-CN; text-combine: letters; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;">抗体，它吸附在组织肥大细胞、嗜碱性粒细胞表面，使机体处于致敏状态。当人体再次接触相同过敏原时，这些过敏原就会和</span><span style=" font-size: 18.0pt; font-family: 'Times New Roman'; mso-ascii-font-family: Times New Roman; mso-fareast-font-family: 宋体; mso-bidi-font-family: +mn-cs; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; text-combine: letters; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;">IgE</span><span style=" font-size: 18.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-fareast-font-family: 宋体; mso-bidi-font-family: +mn-cs; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: zh-CN; text-combine: letters; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;">抗体结合，引起上述两种细胞脱颗粒并释放其中的介质。其中导致花粉过敏的最重要的介质是组胺（</span><span style=" font-size: 18.0pt; font-family: 'Times New Roman'; mso-ascii-font-family: Times New Roman; mso-fareast-font-family: 宋体; mso-bidi-font-family: +mn-cs; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: en-US; text-combine: letters; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;">Histamine</span><span style=" font-size: 18.0pt; font-family: 宋体; mso-ascii-font-family: Times New Roman; mso-fareast-font-family: 宋体; mso-bidi-font-family: +mn-cs; mso-bidi-theme-font: minor-bidi; color: black; mso-color-index: 1; mso-font-kerning: 12.0pt; language: zh-CN; text-combine: letters; mso-style-textfill-type: solid; mso-style-textfill-fill-themecolor: text1; mso-style-textfill-fill-color: black; mso-style-textfill-fill-alpha: 100.0%;">），它可使小血管扩张、血管通透性增加、外分泌活动加强，这是患者鼻黏膜水肿、鼻呼吸阻力增加、分泌物增多的重要物质基础。</span></p>