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2017 ; 199
(6
): 2043-2054
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gab.com Text
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English Wikipedia
Resolvin D1 Improves the Resolution of Inflammation via Activating NF-?B
p50/p50-Mediated Cyclooxygenase-2 Expression in Acute Respiratory Distress
Syndrome
#MMPMID28794232
Gao Y
; Zhang H
; Luo L
; Lin J
; Li D
; Zheng S
; Huang H
; Yan S
; Yang J
; Hao Y
; Li H
; Gao Smith F
; Jin S
J Immunol
2017[Sep]; 199
(6
): 2043-2054
PMID28794232
show ga
Acute respiratory distress syndrome (ARDS) is a severe illness characterized by
uncontrolled inflammation. The resolution of inflammation is a tightly regulated
event controlled by endogenous mediators, such as resolvin D1 (RvD1).
Cyclooxygenase-2 (COX-2) has been reported to promote inflammation, along with
PGE(2), in the initiation of inflammation, as well as in prompting resolution,
with PGD(2) acting in the later phase of inflammation. Our previous work
demonstrated that RvD1 enhanced COX-2 and PGD(2) expression to resolve
inflammation. In this study, we investigated mechanisms underlying the effect of
RvD1 in modulating proresolving COX-2 expression. In a self-limited ARDS model,
an LPS challenge induced the biphasic activation of COX-2, and RvD1 promoted
COX-2 expression during the resolution phase. However, it was significantly
blocked by treatment of a NF-?B inhibitor. In pulmonary fibroblasts, NF-?B
p50/p50 was shown to be responsible for the proresolving activity of COX-2.
Additionally, RvD1 potently promoted p50 homodimer nuclear translocation and
robustly triggered DNA-binding activity, upregulating COX-2 expression via
lipoxin A(4) receptor/formyl peptide receptor 2. Finally, the absence of p50 in
knockout mice prevented RvD1 from promoting COX-2 and PGD(2) expression and
resulted in excessive pulmonary inflammation. In conclusion, RvD1 expedites the
resolution of inflammation through activation of lipoxin A(4) receptor/formyl
peptide receptor 2 receptor and NF-?B p50/p50-COX-2 signaling pathways,
indicating that RvD1 might have therapeutic potential in the management of ARDS.