猪CD200和人类CD200受体之间的分子不相容性在体外异原体免疫反应中
Bomin Kim1, Ji-Jing Yan2, Tae Kyeom Kang3
1Graduate School of Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea.
Xenotransplantation
|May 16, 2024
概括
人类CD200 (hCD200) 在猪细胞中的过度表达比猪CD200 (pCD200) 更有效地抑制异源性免疫反应. 这表明hCD200克服了与人类受体的分子不相容性,而不仅仅是增加表达.
科学领域:
- 免疫学 免疫学 免疫学
- 异种移植研究 异种移植研究
- 细胞和分子生物学 细胞和分子生物学
背景情况:
- 猪内皮细胞 (PEC) 中的人类CD200 (hCD200) 的过度表达可以抑制人类巨细胞的异源性免疫反应.
- 这种抑制背后的机制尚不清楚,可能涉及克服分子不相容性或仅仅增加CD200表达.
研究的目的:
- 调查hCD200在PEC中的有益作用是由于克服了与人类CD200受体的分子不相容性,还是仅仅增加了表达.
- 为了比较PEC对人类免疫细胞的过度表达hCD200与猪CD200 (pCD200) 的抑制活性.
主要方法:
- 在使用带有V5标记的lentiviral载体的PEC中hCD200和pCD200的过度表达.
- 用PEC和U937衍生的人类巨类细胞 (hMC) 或初级人体巨进行异源共培实验.
- 对巨细胞,细胞毒性,细胞因子分泌 (TNF-α,IL-1β,MCP-1),M1表型标记物 (iNOS,Dectin-1,CD86) 和下游信号通路 (Dok2和IκB酸化) 的评估.
主要成果:
- 与PCD200过度表达的PEC相比,hCD200过度表达的PEC显示出更大的抑制人类巨细胞化和细胞毒性.
- hCD200显著降低了来自人类巨细胞的促炎细胞因子 (TNF-α,IL-1β,MCP-1) 和M1表型标记物的分泌,比pCD200更有效.
- 在人类巨细胞中,hCD200诱导了较大的Dok2酸化和抑制IκB酸化,这表明信号传导调制得到了增强.
结论:
- 这些发现表明pCD200和人类CD200受体之间存在显著的分子不兼容性.
- 在PEC中hCD200的优异免疫抑制作用很可能是通过克服这种物种间的分子不相容性来实现的.
- 这突出了使用hCD200通过减轻人类免疫排斥来改善异种移植结果的潜力.
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