林是一个氧化还原传感器,它在体内介导白细胞的伤口吸引力
Sa Kan Yoo1, Taylor W Starnes, Qing Deng
1Program in Cellular and Molecular Biology, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Nature
|November 22, 2011
概括
科学家们发现Src家族激酶 (SFK) Lyn作为氧化还原传感器. 这种传感器在伤口部位检测过氧化 (H2O2),调解中性粒细胞向受伤组织招募.
科学领域:
- 细胞生物学 细胞生物学
- 免疫学 免疫学 免疫学
- 生物化学 生物化学
背景情况:
- 白血球向受伤组织的招募是一个快速的过程.
- 由NADPH氧化酶 (NOX) 生产的过氧化 (H2O2) 介导白细胞向伤口和瘤招募.
- 中性粒细胞用来检测伤口中的氧化还原状态的特定传感器仍然未确定.
研究的目的:
- 为了识别负责中性粒细胞招募到伤口的传感器.
- 阐明中性粒细胞在受伤部位检测氧化还原变化的机制.
主要方法:
- 利用斑马鱼幼虫作为组织损伤和中性粒细胞招募的体内模型.
- 采用基因操纵 (转基因组织特异性复制) 来研究Lyn功能.
- 进行了体外生化测试,以确定参与Lyn激活的特定囊残留物.
主要成果:
- 鉴定了Src家族激酶 (SFK) Lyn作为一种氧化还原传感器,可以调解斑马鱼中伤口中中性粒细胞的招募.
- 证明Lyn激活取决于伤口衍生的H2O2,并且Lyn抑制减弱了中性粒细胞的招募.
- 确定了氨酸残留物466 (C466) 作为氧化介导的Lyn激活和中性粒细胞化学反应的关键.
结论:
- 林的功能是生理性氧化还原传感器,直接检测伤口部位的H2O2.
- 林C466对于中性粒细胞的招募和下游信号发送至关重要,以应对组织损伤.
- 这项研究代表了首次识别了在多细胞生物体中调解白细胞伤口吸引的氧化还原传感器.
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