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The migration of circulating neutrophils towards damaged or infected tissue is absolutely critical to the inflammatory response. L-selectin is a cell adhesion molecule abundantly expressed on circulating neutrophils. For over two decades, neutrophil L-selectin has been assigned the exclusive role of supporting tethering and rolling - the initial stages of the multi-step adhesion cascade. Here, we provide direct evidence for L-selectin contributing to neutrophil transendothelial migration (TEM). We show that L-selectin co-clusters with PECAM-1 - a well-characterised cell adhesion molecule involved in regulating neutrophil TEM. This co-clustering behaviour occurs specifically during TEM, which serves to augment ectodomain shedding of L-selectin and expedite the time taken for TEM (TTT) to complete. Blocking PECAM-1 signalling (through mutation of its cytoplasmic tail), PECAM-1-dependent adhesion or L-selectin shedding, leads to a significant delay in the TTT. Finally, we show that co-clustering of L-selectin with PECAM-1 occurs specifically across TNF- but not IL-1β-activated endothelial monolayers - implying unique adhesion interactomes forming in a cytokine-specific manner. To our knowledge, this is the first report to implicate a non-canonical role for L-selectin in regulating neutrophil TEM. © 2021. Published by The Company of Biologists Ltd.

Citation

Izajur Rahman, Aida Collado Sánchez, Jessica Davies, Karolina Rzeniewicz, Sarah Abukscem, Justin Joachim, Hannah L Hoskins Green, David Killock, Maria Jesus Sanz, Guillaume Charras, Maddy Parsons, Aleksandar Ivetic. L-selectin regulates human neutrophil transendothelial migration. Journal of cell science. 2021 Feb 08;134(3)

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PMID: 33408247

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