膜二二胺乙转移酶 (E2) 在初级胆汁硬化症中对人类胆汁表皮细胞的作用
R Joplin1, J G Lindsay, G D Johnson
1Liver Unit, Queen Elizabeth Hospital, Birmingham, UK.
Lancet (London, England)
|January 11, 1992
概括
在原发性胆汁硬化 (PBC) 中,抗体向线粒体的pyruvate dehydrogenase复合体的E2成分. 这项研究发现,PBC患者的胆道上皮细胞表面存在E2,这表明与胆道损伤有关.
科学领域:
- 免疫学 免疫学 免疫学
- 肝病学 肝病学是一种肝病学.
- 细胞生物学 细胞生物学
背景情况:
- 原发性胆汁硬化 (PBC) 是一种自身免疫性肝脏疾病,其特征是存在针对线粒体中铁酸盐脱酶复合体的二利胺乙转移酶成分 (E2) 的血清抗体.
- 这些抗线粒体抗体对PBC胆道损伤的确切机制尚不完全理解.
研究的目的:
- 在患有初级胆汁硬化症的患者中,研究E2成分在人体肝内胆汁上皮细胞 (BEC) 表面的存在和定位.
- 探索E2表达在BECs在PBC的自身免疫过程中的潜在的病原遗传作用.
主要方法:
- 从PBC患者和正常的肝脏捐赠者中获得的人类肝脏内胆膜上皮细胞 (BEC) 的培养.
- 使用激光扫描共聚焦显微镜检查E2在隔离,可行的BECs的表面表达.
- 使用针对E2的抗体和膜糖蛋白标记物HEA-125进行免疫光染色.
主要成果:
- 从PBC肝脏培养的BEC在培养三天后在其细胞膜上表现出E2表达,这种发现在正常肝脏的BEC中没有观察到.
- 在PBC BEC上E2的膜染色模式与HEA-125标记物的膜染色模式相似.
- 来自正常肝脏的BEC只显示了HEA-125的膜染色,而在细胞质中观察到E2染色,当细胞在抗体化之前被固定时.
结论:
- 线粒体的pyruvate脱酶复合物的E2成分存在于患有初级胆汁硬化症的患者胆汁上皮细胞的表面.
- 这些发现支持抗线粒体抗体和PBC中观察到的胆道损伤之间的病原学关联.
- 在BEC上表达E2的表面表达可能是原发性胆汁硬化中自身免疫性攻击的关键目标.
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