Kirsti Hornigold, Martin J Baker, Polly A Machin, Stephen A Chetwynd, Anna-Karin Johnsson, Chiara Pantarelli, Priota Islam, Melanie Stammers, Laraine Crossland, David Oxley, Hanneke Okkenhaug, Simon Walker, Rachael Walker, Anne Segonds-Pichon, Yoshinori Fukui, Angeliki Malliri, Heidi C E Welch
Rac GTPases are required for neutrophil adhesion and migration, and for the neutrophil effector responses that kill pathogens. These Rac-dependent functions are impaired when neutrophils lack the activators of Rac, Rac-GEFs from the Prex, Vav, and Dock families. In this study, we demonstrate that Tiam1 is also expressed in neutrophils, governing focal complexes, actin cytoskeletal dynamics, polarisation, and migration, in a manner depending on the integrin ligand to which the cells adhere. Tiam1 is dispensable for the generation of reactive oxygen species but mediates degranulation and NETs release in adherent neutrophils, as well as the killing of bacteria...
2023: Frontiers in Immunology