防御性耐受性驱使潜入病原性B细胞的重编程和功能障碍,确保耐受性的维持
Koki Hayashi1,2,3, Takahiro Yokose1,2,3, Jenna Lancey1,2,3
1Center for Transplantation Sciences, Department of Surgery, Massachusetts General Hospital and Harvard Medical School; Boston, MA, USA.
Research square
|September 2, 2025
概括
调控性B细胞 (Bregs) 不会导致移植耐受性. 相反,B细胞上的FcγRIIB和Siglec-G是移植接受和瘤免疫逃避的关键.
科学领域:
- 免疫学
- 移植免疫学
- 癌症免疫学
背景情况:
- 通过"防御性耐受性",入接受移植的免疫细胞被重新编程为类似调节/耗尽的细胞.
- 之前在接受的移植中观察到一种调节性B细胞 (Breg) 签名.
研究的目的:
- 调查B细胞及其调控功能在移植中的作用.
- 探索B细胞抑制受体Siglec-G和FcγRIIB在移植耐受性的作用.
- 确定类似的B细胞机制是否有助于瘤免疫逃避.
主要方法:
- 用μMT接受者 (缺乏B细胞) 来评估异种移植排斥.
- 在接受的和肺全移植中分析Siglec-G和FcγRIIB表达.
- 将移植给B6.Fcgr2b淘汰 (KO) 接受者.
- 对人类黑色素瘤SIGLEC10表达的分析及其与抗PD1治疗反应的相关性.
主要成果:
- 无论是B细胞枯竭还是μMT接受者都没有显示移植排斥,尽管Breg类型.
- 在接受和肺全移植的患者中观察到Siglec- G和FcγRIIB的表达增加.
- 在接受B6.Fcgr2bKO的移植患者中,出现了抗体介导的排斥.
- 人类黑色素瘤中的SIGLEC10表达与抗PD1治疗的耐药性相关.
结论:
- 在维持移植耐受性方面,FcγRIIB和Siglec- G的B细胞表达是至关重要的.
- 这些B细胞抑制受体在瘤逃避抗瘤免疫力中起作用.
- FcγRIIB和Siglec- G是增强抗瘤免疫力和改善移植结果的潜在治疗点.
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