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Updated: Aug 8, 2026

Imaging the Neutrophil Phagosome and Cytoplasm Using a Ratiometric pH Indicator
Published on: April 5, 2017
Neutrophil direction sensing and superoxide production linked by the GTPase-activating protein GIT2
Yuichi Mazaki1, Shigeru Hashimoto, Tohru Tsujimura
1Department of Molecular Biology, Osaka Bioscience Institute, Suita 565-0874, Japan.
Abstract:
In neutrophils, superoxide anion production generally accompanies chemotaxis and functions in killing invading pathogens. The GIT2 GTPase-activating protein binds to the guanine nucleotide-exchange factor alphaPIX. Here we show that GIT2 was necessary for directional chemotaxis and for the suppression of superoxide production in G protein-coupled receptor-stimulated neutrophils. GIT2 was also necessary for the orientation of superoxide production toward chemoattractant sources. GIT2 suppressed the activity of ADP ribosylation factor 1 and was a component of the Gbetagamma subunit-mediated direction-sensing machinery 'downstream' of G protein-coupled receptor signaling. This study establishes a function for GIT2 in linking chemotaxis and superoxide production in neutrophils and shows that loss of GIT2 in vivo leads to an immunodeficient state.
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