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2017 ; 7
(1
): 5119
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Selenoprotein MsrB1 promotes anti-inflammatory cytokine gene expression in
macrophages and controls immune response in vivo
#MMPMID28698597
Lee BC
; Lee SG
; Choo MK
; Kim JH
; Lee HM
; Kim S
; Fomenko DE
; Kim HY
; Park JM
; Gladyshev VN
Sci Rep
2017[Jul]; 7
(1
): 5119
PMID28698597
show ga
Post-translational redox modification of methionine residues often triggers a
change in protein function. Emerging evidence points to this reversible protein
modification being an important regulatory mechanism under various physiological
conditions. Reduction of oxidized methionine residues is catalyzed by methionine
sulfoxide reductases (Msrs). Here, we show that one of these enzymes, a
selenium-containing MsrB1, is highly expressed in immune-activated macrophages
and contributes to shaping cellular and organismal immune responses. In
particular, lipopolysaccharide (LPS) induces expression of MsrB1, but not other
Msrs. Genetic ablation of MsrB1 did not preclude LPS-induced intracellular
signaling in macrophages, but resulted in attenuated induction of
anti-inflammatory cytokines, such as interleukin (IL)-10 and the IL-1 receptor
antagonist. This anomaly was associated with excessive pro-inflammatory cytokine
production as well as an increase in acute tissue inflammation in mice. Together,
our findings suggest that MsrB1 controls immune responses by promoting
anti-inflammatory cytokine expression in macrophages. MsrB1-dependent reduction
of oxidized methionine in proteins may be a heretofore unrecognized regulatory
event underlying immunity and inflammatory disease, and a novel target for
clinical applications.