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Defective rapid cell shape and transendothelial migration by calpain-1 null neutrophils.
Biochemical and Biophysical Research Communications 2018 November 6
It has been proposed that Ca2+ activation of calpain-1 is an important trigger for rapid cell spreading by neutrophils. In this paper, we have investigated this by assessing the ex vivo functioning of neutrophils from calpain-1 null mice, Calpain-1 null neutrophils failed to migrate through TNF-activated endothelial monolayers. The failure to transmigrate through endothelial monolayers was therefore unlikely to be due to a failure of chemotaxis as chemotaxis by adherent calpain-1 null neutrophils towards fMLP was unpaired. In contrast, the capacity of calpian-1 neutrophils to spontaneously spread was limited to smaller diameters than for wild type cells. Photolytic uncaging of IP3 with Individual wild type neutrophils resulted in a large Ca2+ signal and rapid cell spreading. In contrast, calpain-1 neutrophils failed to spread in response to the IP3 -induced Ca2+ signal. This work has therefore demonstrated that the presence of calpain-1 was required for effective rapid cell spreading by neutrophils.
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