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2017 ; 8
(8
): e3004
Nephropedia Template TP
gab.com Text
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English Wikipedia
Total tanshinones exhibits anti-inflammatory effects through blocking TLR4
dimerization via the MyD88 pathway
#MMPMID28817116
Gao H
; Liu X
; Sun W
; Kang N
; Liu Y
; Yang S
; Xu QM
; Wang C
; Chen X
Cell Death Dis
2017[Aug]; 8
(8
): e3004
PMID28817116
show ga
Tanshinones belong to a group of lipophilic constituents of Salvia miltiorrhiza
Bunge (Danshen), which is widely used in traditional Chinese medicine. A deluge
of studies demonstrated that tanshinones exert anti-inflammatory effects, but the
underlying mechanisms remain unclear to date. This study investigated the
anti-inflammatory effects and mechanisms of total tanshinones (TTN). TTN
suppressed the expression of cyclooxygenase-2 (COX-2) and inducible nitric oxide
synthase (iNOS) and the secretion of TNF-?, IL-6, and IL-1? in RAW264.7 cells,
bone marrow-derived macrophages, and THP-1 cells. TTN attenuated the LPS-induced
transcriptional activity of NF-?B and decreased I?B-? and IKK phosphorylation and
NF-?B/p65 nuclear translocation. Furthermore, TTN inhibited the LPS-induced
transcriptional activity of AP-1, which was induced by the reduction of JNK1/2,
ERK1/2, and p38MAPK phosphorylation. TTN blocked LPS-induced Toll-like receptor 4
(TLR4) dimerization, which consequently decreased MyD88 recruitment and TAK1
phosphorylation. In addition, TTN pretreatment effectively inhibited
xylene-induced ear edema and LPS-induced septic death and improved LPS-induced
acute kidney injury in mice. TTN exerts anti-inflammatory effects in vitro and in
vivo by blocking TLR4 dimerization to activate MyD88-TAK1-NF-?B/MAPK signaling
cascades, which provide the molecular basis of the anti-inflammatory effect of
Danshen and suggest that TTN is a potential agent for the treatment of
inflammatory diseases.