TLR3刺激会使衰老的介质细胞干细胞复苏,并恢复移植对宿主疾病中的免疫抑制功能
Linlin Jin1, Ziqi Hu1, Yuxin Huang1
1State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Haihe Laboratory of Cell Ecosystem, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China; Tianjin Institutes of Health Science, Tianjin, China.
细胞衰老降低了介质干细胞 (MSC) 治疗移植对宿主疾病 (GVHD) 的有效性. 激活托尔类受体3 (TLR3) 与多I:C一起,可以使老年MSC复苏,恢复其治疗潜力.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 再生医学是一种再生医学.
背景情况:
- 移植与宿主疾病 (GVHD) 是全原造血细胞干细胞移植的重大并发症,特别是在对皮质类固醇无反应的患者中.
- 介质干细胞 (MSC) 由于其免疫抑制性质,对GVHD治疗具有前景,但随着体外扩张诱导的衰老,它们的有效性会降低.
研究的目的:
- 调查MSC衰老对GVHD结果的影响.
- 探索复苏老年MSC的策略,以增强其对GVHD的治疗潜力.
主要方法:
- 在小鼠GVHD模型中,早期 (P5) 和晚期 (P15) 人类MSC的比较.
- 单细胞RNA测序以识别MSC衰老期间的分子变化.
- 用polyyinosinic:polycytidylic acid [poly(I:C) 处理老化的MSC以评估复原效应.
主要成果:
- 与晚期MSC相比,早期MSC显著降低了GVHD的严重程度,改善了生存率,并减少了全身炎症.
- MSC的衰老导致了免疫调节子群的丧失和降低了Toll-like受体3 (TLR3) 信号传递.
- 聚I:C原始化恢复了老年MSC的免疫抑制能力,增强了T细胞抑制和亡.
结论:
- 复制性衰老通过破坏TLR3信号来损害MSC的免疫调节功能.
- 通过poly (I:C) 激活TLR3,使老化MSC复原,恢复它们对GVHD的治疗效果.
- 这提供了一种潜在的临床策略,以改善针对GVHD的MSC基础免疫疗法.
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