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抑制受体Siglec-E控制抗原呈现细胞的激活和T细胞介导的移植排斥
Thiago J Borges1, Karina Lima1, Rodrigo B Gassen1
1Center for Transplantation Sciences, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02129, USA.
酸结合性免疫球蛋白类似的lectin-E (Siglec-E或SigE) 抑制心脏移植患者的炎症. 缺少SigE通过增加髓状细胞激活来加速排斥,突显其在移植中的治疗潜力.
科学领域:
- 免疫学 免疫学 免疫学
- 移植生物学 移植生物学
- 分子医学是分子医学.
背景情况:
- 移植拒绝涉及炎症和T细胞反应,但天生的免疫调节的理解不充分.
- 目前的免疫抑制剂无法充分控制先天免疫反应.
- 控制移植中的先天免疫力的监管信号是关键的目标.
研究的目的:
- 调查酸结合性免疫球蛋白类似的莱克-E (Siglec-E或SigE) 在移植排斥期间调节先天免疫反应中的作用.
- 为了确定SigE是否在器官移植的背景下对髓状细胞起到抑制受体的作用.
主要方法:
- 利用小鼠心脏移植模型与SigE缺乏的接受者和捐赠者.
- 分析了骨髓细胞激活,信号通路 (NF-κB) 和细胞因子生产 (TNF-α).
- 对Siglec-7和Siglec-9的表达和与临床结果相关性进行了人体全移植活检.
主要成果:
- 接受者的SigE缺乏加速了急性排斥,与增强的树突细胞 (DC) 激活和促炎信号相关.
- 对DCs的SigE过度表达降低了它们的激活和T细胞全刺激能力.
- 人类Siglecs-7和-9在拒绝异位移植的升级与更好的移植存活相关.
结论:
- 西格莱克-E/7/9作为抗原呈现细胞的关键抑制受体,控制T细胞介导的移植排斥.
- 向SigE/7/9是一个有前途的治疗策略,可以改善全移植的存活率并减少排斥.
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