在血清中,CL-11以功能上不同的异构体的形式循环
Adrian Sutta1,2, Nelia Nina Leemans1, Michael Ploug3,4
1Laboratory of Molecular Medicine, Department of Clinical Immunology, Copenhagen University Hospital: Rigshospital, Copenhagen, Denmark.
集合素-11 (CL-11) 异型A和D表现出不同的生物功能. CL-11D与集蛋白-10 (CL-10) 和较低的连接体结合的相互作用减少,这可能会限制其补充激活作用.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 补充系统 补充系统
背景情况:
- 集合素-11 (CL-11) 是一个在莱克补充通路中的模式识别分子.
- 替代性拼接COLEC11基因产生血清异型A和D,不同于原样区域的长度.
- 这些异构体的生物学差异和对补体激活的影响尚未完全理解.
研究的目的:
- 阐明CL-11异型A和D之间的生物学差异.
- 调查它们与集合素-10 (CL-10) 和MASPs的相互作用.
- 评估它们在补充级联激活中的潜在作用.
主要方法:
- 生产复合CL-11异型 (A和D) 和CL-10/11复合体.
- 对CL-10/11异构复合物的形成和稳定性的分析.
- 血清CL-11的免疫沉,然后进行质谱学.
- 评估CL-11异型体的MASP和配体结合能力.
主要成果:
- 两种CL-11异型与CL-10相关,其中CL-11D的结合性降低.
- 形成了CL-10/11异构复合物,表现出比同类三元体更大的稳定性.
- 原生CL-11以CL-10/11与MASP-1和MASP-3的异构复合体的形式循环.
- 与CL-11A相比,CL-11D结合的MASP,但与CL-11A相比,结合带的结合减少.
- 在CL-11D中显示了减少的寡合化和异构复合体的形成.
结论:
- CL-11D的较短的原区域不会阻止MASP结合,但会减少连接体相互作用和异构复合体的形成.
- 与全长CL-11A异型相比,CL-11D可能具有有限的补体激活潜力.
- 这些发现突出了CL-11异型体在补充调节中的功能区别.
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