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2017 ; 8
(33
): 55051-55063
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7-deacetylgedunin suppresses inflammatory responses through activation of
Keap1/Nrf2/HO-1 signaling
#MMPMID28903401
Chen JY
; Zhu GY
; Su XH
; Wang R
; Liu J
; Liao K
; Ren R
; Li T
; Liu L
Oncotarget
2017[Aug]; 8
(33
): 55051-55063
PMID28903401
show ga
Macrophages play a critical role in a variety of inflammatory diseases.
Activation of Keap1/Nrf2/HO-1 signaling results in inactivation of macrophages
and amelioration of inflammatory and autoimmune conditions. Hence, discovery for
the activators of Keap1/Nrf2/HO-1 signaling has become a promising strategy for
treatment inflammatory diseases. In the current study, the anti-inflammatory
potential of 7-deacetylgedunin (7-DGD), a limonin chemical isolated from the
fruits of Toona sinensis (A. Juss.) Roem, was intensively examined in vivo and in
vitro for the first time. Results showed that 7-DGD alleviated mice mortality
induced by LPS. Mechanistic study showed that 7-DGD suppressed macrophage
proliferation via induction of cell arrest at the G0/G1 phase. Furthermore, 7-DGD
inhibited iNOS expression, which is correlated with the increases of NQO1, HO-1
and UGT1A1 mRNA expression as well as HO-1 protein expression level in the cells.
More importantly, 7-DGD markedly decreased Keap1 expression, promoted p62
expression, and facilitated Nrf2 translocation and localization in the nucleus of
macrophages, and in turn up-regulates these anti-oxidant enzymes expression,
eventually mediated anti-inflammatory effect. Collectively, 7-DGD suppresses
inflammation in vivo and in vitro, indicating that the compound is valuable for
further investigation as an anti-inflammatory agent in future.