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2016 ; 291
(23
): 12370-82
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Induction of Siglec-1 by Endotoxin Tolerance Suppresses the Innate Immune
Response by Promoting TGF-?1 Production
#MMPMID27129263
Wu Y
; Lan C
; Ren D
; Chen GY
J Biol Chem
2016[Jun]; 291
(23
): 12370-82
PMID27129263
show ga
Sepsis is one of the leading causes of death worldwide. Although the prevailing
theory for the sepsis syndrome is a condition of uncontrolled inflammation in
response to infection, sepsis is increasingly being recognized as an
immunosuppressive state known as endotoxin tolerance. We found sialylation of
cell surface was significantly increased on LPS-induced tolerant cells; knockdown
of Neu1 in macrophage cell line RAW 264.7 cells resulted in enhanced LPS-induced
tolerance, whereas overexpression of Neu1 or treatment with sialidase abrogated
LPS-induced tolerance, as defined by measuring TNF-? levels in the culture
supernatants. We also found that the expression of Siglec-1 (a member of sialic
acid-binding Ig (I)-like lectin family members, the predominant sialic
acid-binding proteins on cell surface) was specifically up-regulated in endotoxin
tolerant cells and the induction of Siglec-1 suppresses the innate immune
response by promoting TGF-?1 production. The enhanced TGF-?1 production by
Siglec-1 was significantly attenuated by spleen tyrosine kinase (Syk) inhibitor.
Knockdown of siglec-1 in RAW 264.7 cells resulted in inhibiting the production of
TGF-?1 by ubiquitin-dependent degradation of Syk. Mechanistically, Siglec-1
associates with adaptor protein DNAX-activation protein of 12 kDa (DAP12) and
transduces a signal to Syk to control the production of TGF-?1 in endotoxin
tolerance. Thus, Siglec-1 plays an important role in the development of endotoxin
tolerance and targeted manipulation of this process could lead to a new
therapeutic opportunity for patients with sepsis.