期刊
NATURE COMMUNICATIONS
卷 7, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms12658
关键词
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资金
- National Institutes of Health, USA (NIH) [HL078784]
- WSA postdoctoral fellowship from the American Heart Association, USA (AHA) [16POST31160014]
Neutrophils are essential for innate immunity and inflammation and many neutrophil functions are beta(2) integrin-dependent. Integrins can extend (E+) and acquire a high-affinity conformation with an 'open' headpiece (H+). The canonical switchblade model of integrin activation proposes that the E+ conformation precedes H+, and the two are believed to be structurally linked. Here we show, using high-resolution quantitative dynamic footprinting (qDF) microscopy combined with a homogenous conformation-reporter binding assay in a microfluidic device, that a substantial fraction of beta(2) integrins on human neutrophils acquire an unexpected E-H+ conformation. E-H+ beta(2) integrins bind intercellular adhesion molecules (ICAMs) in cis, which inhibits leukocyte adhesion in vitro and in vivo. This endogenous anti-inflammatory mechanism inhibits neutrophil aggregation, accumulation and inflammation.
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