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Cyclic guanosine monophosphate-dependent protein kinase is targeted to
intermediate filaments and phosphorylates vimentin in A23187-stimulated
human neutrophils
KB Pryzwansky, TA Wyatt and TM Lincoln
Department of Pathology, University of North Carolina, Chapel Hill
27599-7525.
The effects of the calcium ionophore, A23187, on human neutrophil
activation were studied in relation to the signaling mechanism of cyclic
guanosine monophosphate (cGMP)-dependent protein kinase (G- kinase).
Immunocytochemistry demonstrated that G-kinase translocated from a diffuse
localization in the cytoplasm to the cytoskeleton after stimulation with
A23187. Over a period of 5 minutes, G-kinase was transiently colocalized
with the intermediate filament protein, vimentin. At 3 minutes' stimulation
with A23187, colocalization of G- kinase and vimentin was predominantly
confined to filaments that extended into the uropod. The time of
colocalization of G-kinase and vimentin was reduced in the
A23187-stimulated cell from 3 minutes to 1 minute by 8-Br-cGMP. Coincident
with colocalization was an increase in cGMP levels and transient
phosphorylation of vimentin in adhered A23187- stimulated cells.
Phosphorylation of vimentin was maximal after 3 minutes with A23187, and
was essentially over at 5 minutes. The time of phosphorylation of vimentin
was also reduced from 3 minutes to 1 minute when cells were preincubated
with 8-Br-cGMP and then stimulated with A23187, which suggests that cyclic
adenosine monophosphate (cAMP)- dependent protein kinase does not
phosphorylate vimentin in A23187- treated neutrophils. Phosphorylation of
vimentin was not observed in nonactivated cells treated only with
8-Br-cGMP. The presence of the protein kinase C inhibitors, staurosporine
or H-7, did not inhibit vimentin phosphorylation in A23187-treated cells,
which provides supportive data that protein kinase C is not the
phosphorylating enzyme. These results suggest that vimentin and G-kinase
are colocalized in a Ca(2+)-dependent manner in neutrophils, and that
vimentin is transiently phosphorylated by G-kinase in response to the
colocalization of the two proteins. The transient redistribution of
compartmentalized G-kinase represents one type of neutrophil activation
mechanism.
Volume 85,
Issue 1,
pp. 222-230,
01/01/1995
Copyright © 1995 by The American Society of Hematology

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