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Publication : Vascular surveillance by haptotactic blood platelets in inflammation and infection.

First Author  Nicolai L Year  2020
Journal  Nat Commun Volume  11
Issue  1 Pages  5778
PubMed ID  33188196 Mgi Jnum  J:301301
Mgi Id  MGI:6504436 Doi  10.1038/s41467-020-19515-0
Citation  Nicolai L, et al. (2020) Vascular surveillance by haptotactic blood platelets in inflammation and infection. Nat Commun 11(1):5778
abstractText  Breakdown of vascular barriers is a major complication of inflammatory diseases. Anucleate platelets form blood-clots during thrombosis, but also play a crucial role in inflammation. While spatio-temporal dynamics of clot formation are well characterized, the cell-biological mechanisms of platelet recruitment to inflammatory micro-environments remain incompletely understood. Here we identify Arp2/3-dependent lamellipodia formation as a prominent morphological feature of immune-responsive platelets. Platelets use lamellipodia to scan for fibrin(ogen) deposited on the inflamed vasculature and to directionally spread, to polarize and to govern haptotactic migration along gradients of the adhesive ligand. Platelet-specific abrogation of Arp2/3 interferes with haptotactic repositioning of platelets to microlesions, thus impairing vascular sealing and provoking inflammatory microbleeding. During infection, haptotaxis promotes capture of bacteria and prevents hematogenic dissemination, rendering platelets gate-keepers of the inflamed microvasculature. Consequently, these findings identify haptotaxis as a key effector function of immune-responsive platelets.
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