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2017 ; 46
(4
): 635-648
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Tyrosine Kinase SYK Licenses MyD88 Adaptor Protein to Instigate IL-1?-Mediated
Inflammatory Disease
#MMPMID28410990
Gurung P
; Fan G
; Lukens JR
; Vogel P
; Tonks NK
; Kanneganti TD
Immunity
2017[Apr]; 46
(4
): 635-648
PMID28410990
show ga
Mice carrying a hypomorphic point mutation in the Ptpn6 gene (Ptpn6(spin) mice)
develop an inflammatory skin disease that resembles neutrophilic dermatosis in
humans. Here, we demonstrated that interleukin-1? (IL-1?) signaling through IL-1R
and MyD88 in both stromal and immune cells drive inflammation in Ptpn6(spin)
mice. We further identified SYK as a critical kinase that phosphorylates MyD88,
promoted MyD88-dependent signaling and mediates dermatosis in Ptpn6(spin) mice.
Our studies further demonstrated that SHP1 encoded by Ptpn6 binds and suppresses
SYK activation to inhibit MyD88 phosphorylation. Downstream of SHP1 and
SYK-dependent counterregulation of MyD88 tyrosine phosphorylation, we have
demonstrated that the scaffolding function of receptor interacting protein kinase
1 (RIPK1) and tumor growth factor-? activated kinase 1 (TAK1)-mediating signaling
were required to spur inflammatory disease. Overall, these studies identify SHP1
and SYK crosstalk as a critical regulator of MyD88 post-translational
modifications and IL-1-driven inflammation.