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视觉化免疫检查点抑制剂在动脉样硬化中产生炎症
Lanlan Lou1, Lisa Detering1, Hannah Luehmann1
1Mallinckrodt Institute of Radiology (L.L., L.D., H.L., D.S., A.L., D.L., X.Z., G.S.H., Y.L.), Washington University, St. Louis, MO.
Circulation research
|September 27, 2024
概括
免疫检查点抑制剂治疗可以通过增加促炎性巨细胞使动脉样硬化恶化. 使用新型放射追踪器的正子发射断层扫描 (PET) 可以在小鼠模型中非侵入性地检测出这种加速炎症.
科学领域:
- 心血管研究研究心血管研究
- 免疫学 免疫学 免疫学
- 放射化学 放射化学是指辐射化学.
背景情况:
- 免疫检查点抑制剂 (ICI) 可以导致免疫相关的不良事件,包括加速动脉样硬化.
- 预炎性CCR2+巨细胞在动脉样硬化中起着关键作用,但在ICI治疗期间缺乏非侵入性方法来跟踪它们.
- 了解这些机制对于管理ICI相关心血管并发症至关重要.
研究的目的:
- 开发和验证一种非侵入性正子发射断层扫描 (PET) 成像方法,以评估动脉样硬化中CCR2+巨细胞积累.
- 调查免疫相关不良事件的潜在机制,特别是ICI治疗后加速动脉样硬化.
- 探索CCR2向PET在实体中监测斑块炎症的潜力.
主要方法:
- 易患动脉样硬化的小鼠 (Apoe-/- 和 Ldlr-/-) 接受了抗PD1抗体 (ICI) 或控制IgG/盐水的治疗.
- 在PET成像中使用了Cu-DOTA-ECL1i,这是一种新的CCR2向放射追踪器.
- 免疫组织化学,流细胞测量和单细胞RNA测序用于动脉样硬化动脉的分子特征.
主要成果:
- PET成像显示ICI治疗小鼠的Cu-DOTA-ECL1i摄入量显著更高,表明CCR2+巨细胞积累增加.
- 免疫和流动细胞计证实了治疗小鼠动脉样硬化斑块中CCR2+细胞种群的升高.
- 单细胞RNA测序确定了髓状细胞中CCR2表达的增加,并且发现干扰素- (IFNγ) 对恶化的炎症和斑块进展至关重要.
结论:
- Cu-DOTA-ECL1i PET可以非侵入性地检测由抗PD1疗法诱导的加速动脉硬性斑块炎症.
- 观察到的炎症依赖于剂量和时间,主要由IFNγ信号传递介导.
- 针对CCR2的PET显示为可视化斑块炎症和探索ICI相关不良事件机制的工具.
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