Berberine suppresses LPS-induced inflammation through modulating Sirt1/NF-κB signaling pathway in RAW264.7 cells.

Abstract:

:Chronic inflammation is a major contributing factor in the pathogenesis of many diseases. Natural product berberine (BBR) exhibits potent anti-inflammatory effect in vitro and in vivo, while the underlying mechanisms remain elusive. Sirt1, a NAD+-dependent protein deacetylase, was recently found to play an important role in modulating the development and progression of inflammation. Thus, we speculate that Sirt1 might mediate the inhibitory effect of BBR on inflammation. In LPS-stimulated RAW264.7 macrophages, BBR treatment significantly downregulated the expression of proinflammatory cytokines such as MCP-1, IL-6 and TNF-α. Importantly, BBR potently reversed LPS-induced down-regulation of Sirt1. Consistently, the inhibitory effects of BBR on proinflammatory cytokines expression was largely abrogated by Sirt1 inhibition either by EX527, a Sirt1 inhibitor or Sirt1 siRNA. Further mechanistic studies revealed that BBR-induced inhibition of NF-κB is Sirt1-dependent, as either pharmacologically or genetically inactivating Sirt1 enhanced the IκΒα degradation, IKK phosphorylation, NF-κB p65 acetylation and DNA-binding activity. Taken together, our results provide the first evidence that BBR potently suppressed inflammatory responses in macrophages through inhibition of NF-κB signaling via Sirt1-dependent mechanisms.

journal_name

Int Immunopharmacol

authors

Zhang H,Shan Y,Wu Y,Xu C,Yu X,Zhao J,Yan J,Shang W

doi

10.1016/j.intimp.2017.08.032

subject

Has Abstract

pub_date

2017-11-01 00:00:00

pages

93-100

eissn

1567-5769

issn

1878-1705

pii

S1567-5769(17)30339-9

journal_volume

52

pub_type

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