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The Herman B Wells Center for Pediatric Research, Department of Pediatrics (Hematology/Oncology) and Medical and Molecular Genetics, The James Whitcomb Riley Hospital for Children, Indiana University Medical Center, Indianapolis, IN 46202
Rac2 is a hematopoietic-specific Rho family GTPase implicated as an
important constituent of the NADPH oxidase complex and shares 92%
amino acid identity with the ubiquitously expressed Rac1. In bone
marrow (BM) neutrophils isolated from
rac2-/- mice generated by gene targeting,
we previously reported that PMA-induced superoxide production was
reduced by about 4-fold, which was partially corrected in
TNF-
-primed BM neutrophils and in peritoneal exudate neutrophils. We
investigated receptor-mediated activation of the NADPH oxidase in the
current study, finding that superoxide production in
rac2-/- BM and peritoneal exudate
neutrophils was normal in response to opsonized zymosan, reduced to
22% of wild type in response to IgG-coated SRBC, and almost absent in
response to fMLP. In wild-type murine BM neutrophils, phosphorylation
of extracellular signal-regulated kinase 1/2 (ERK1/2), p38
mitogen-activated protein kinase, c-Jun N-terminal kinase, and Akt was
induced by PMA or fMLP, which was decreased in
rac2-/- neutrophils for ERK1/2 and p38.
Activation of p38 by either opsonized zymosan or IgG-coated SRBC was
similar in wild-type and rac2-/- cells.
Inhibition of ERK1/2 or p38 activation using either PD98059 or
SB203580, respectively, had only a modest effect on fMLP-elicited
superoxide production and no effect on the PMA-induced response. These
data provide genetic evidence supporting an important role for Rac2 in
regulating neutrophil NADPH oxidase activation downstream of
chemoattractant and Fc
receptors. The effect of Rac2 deficiency on
superoxide production is probably exerted through multiple pathways,
including those independent of mitogen-activated protein kinase
activation.
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