对于感染后的修复至关重要的一种单细胞-素-血管生成途径
Rachel M Kratofil1,2, Hanjoo B Shim1,2, Raymond Shim1,2
1Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.
Nature
|August 10, 2022
概括
单细胞,而不是中性粒细胞,通过控制感染后的瘦素水平和血管生长来调节伤口愈合. 这些细胞转化为巨细胞, 影响组织修复和痕形成.
科学领域:
- 免疫学
- 伤口的愈合
- 细胞生物学
背景情况:
- 传统上认为炎症单细胞对细菌清除至关重要.
- 中性粒细胞表现出更强大的杀菌功能,并且在感染期间比单细胞数量更大.
- 单细胞具有独特的分化成巨细胞的能力,具有超出直接感染控制的多种功能.
研究的目的:
- 研究单细胞和中性粒细胞在黄金葡萄球菌感染和随后的伤口愈合中的不同作用.
- 阐明单细胞除了细菌清除之外的功能,特别是它们在组织修复和代谢调节中的作用.
- 了解单细胞衍生的巨细胞对脂肪细胞功能,素生产和愈合过程中的血管化的影响.
主要方法:
- 使用涂有金黄色葡萄球菌的异物模型研究皮肤感染的进展和随着时间的推移.
- 使用时隔成像来观察单细胞和中性细胞的招募模式和定位.
- 研究了单细胞缺乏对小鼠伤口愈合,皮下厚度,瘦素水平,血管化和痕形成的影响.
- 评估单细胞衍生的格林在调节叶丁对血管过度生长和愈合的影响中的作用.
主要成果:
- 在低剂量感染中,单细胞和中性粒细胞的招募数量相似,但在高剂量感染中不同.
- 单细胞在感染部位周围局部化,而中性粒细胞透;单细胞没有对细菌清除作出贡献.
- 单细胞分化为长期存在的巨细胞,调节脂肪细胞的扩张和瘦素的产生.
- 单细胞缺乏导致皮下厚度增加,瘦素水平升高,血管化过度,愈合延迟,痕变厚.
- 单细胞产生的格林抵消了瘦素的作用,减少了血管过度生长,改善了愈合.
结论:
- 单细胞在伤口修复中发挥关键作用,与细菌清除不同,通过调节瘦素水平和再血管化.
- 单细胞衍生的巨细胞作为细胞的修复剂,在组织修复过程中控制代谢和血管变化.
- 针对单细胞驱动的通路,如素和胆固醇信号传递,有可能改善伤口愈合的结果.
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