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2016 ; 196
(9
): 3828-33
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G?i2 and G?i3 Differentially Regulate Arrest from Flow and Chemotaxis in Mouse
Neutrophils
#MMPMID26976957
Kuwano Y
; Adler M
; Zhang H
; Groisman A
; Ley K
J Immunol
2016[May]; 196
(9
): 3828-33
PMID26976957
show ga
Leukocyte recruitment to inflammation sites progresses in a multistep cascade.
Chemokines regulate multiple steps of the cascade, including arrest,
transmigration, and chemotaxis. The most important chemokine receptor in mouse
neutrophils is CXCR2, which couples through G?i2- and G?i3-containing
heterotrimeric G proteins. Neutrophils arrest in response to CXCR2 stimulation.
This is defective in G?i2-deficient neutrophils. In this study, we show that
G?i3-deficient neutrophils showed reduced transmigration but normal arrest in
mice. We also tested G?i2- or G?i3-deficient neutrophils in a CXCL1 gradient
generated by a microfluidic device. G?i3-, but not G?i2-, deficient neutrophils
showed significantly reduced migration and directionality. This was confirmed in
a model of sterile inflammation in vivo. G?i2-, but not G?i3-, deficient
neutrophils showed decreased Ca(2+) flux in response to CXCR2 stimulation.
Conversely, G?i3-, but not G?i2-, deficient neutrophils exhibited reduced AKT
phosphorylation upon CXCR2 stimulation. We conclude that G?i2 controls arrest and
G?i3 controls transmigration and chemotaxis in response to chemokine stimulation
of neutrophils.
|Animals
[MESH]
|Calcium Signaling/genetics
[MESH]
|Cell Movement/genetics
[MESH]
|Cells, Cultured
[MESH]
|Chemokine CXCL1/metabolism
[MESH]
|Chemotaxis/genetics
[MESH]
|GTP-Binding Protein alpha Subunit, Gi2/genetics/*metabolism
[MESH]
|GTP-Binding Protein alpha Subunits, Gi-Go/genetics/*metabolism
[MESH]