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2017 ; 2017
(ä): 4347121
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Regulation of Discrete Functional Responses by Syk and Src Family Tyrosine
Kinases in Human Neutrophils
#MMPMID28512645
Ear T
; Tatsiy O
; Allard FL
; McDonald PP
J Immunol Res
2017[]; 2017
(ä): 4347121
PMID28512645
show ga
Neutrophils play a critical role in innate immunity and also influence adaptive
immune responses. This occurs in good part through their production of
inflammatory and immunomodulatory cytokines, in conjunction with their prolonged
survival at inflamed foci. While a picture of the signaling machinery underlying
these neutrophil responses is now emerging, much remains to be uncovered. In this
study, we report that neutrophils constitutively express various Src family
isoforms (STKs), as well as Syk, and that inhibition of these protein tyrosine
kinases selectively hinders inflammatory cytokine generation by acting
posttranscriptionally. Accordingly, STK or Syk inhibition decreases the
phosphorylation of signaling intermediates (e.g., eIF-4E, S6K, and MNK1) involved
in translational control. By contrast, delayed apoptosis appears to be
independent of either STKs or Syk. Our data therefore significantly extend our
understanding of which neutrophil responses are governed by STKs and Syk and
pinpoint some signaling intermediates that are likely involved. In view of the
foremost role of neutrophils in several chronic inflammatory conditions, our
findings identify potential molecular targets that could be exploited for future
therapeutic intervention.
|*Gene Expression Regulation
[MESH]
|Apoptosis
[MESH]
|Enzyme Precursors/metabolism
[MESH]
|Humans
[MESH]
|Intracellular Signaling Peptides and Proteins/metabolism
[MESH]