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 Immunopharmacoljournal_title
International immunopharmacologyauthors
Zhang H,Shan Y,Wu Y,Xu C,Yu X,Zhao J,Yan J,Shang Wdoi
10.1016/j.intimp.2017.08.032subject
Has Abstractpub_date
2017-11-01 00:00:00pages
93-100eissn
1567-5769issn
1878-1705pii
S1567-5769(17)30339-9journal_volume
52pub_type
杂志文章abstract:BACKGROUND:Immune thrombocytopenia (ITP) is an immune-mediated acquired autoimmune hemorrhagic disease. About one-third of patients are unresponsive to first-line therapies. Thalidomide (THD) as an immunomodulatory agent is now used to treat several autoimmune disorders. Therefore, we assessed the safety and efficacy o...
journal_title:International immunopharmacology
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journal_title:International immunopharmacology
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journal_title:International immunopharmacology
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journal_title:International immunopharmacology
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journal_title:International immunopharmacology
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journal_title:International immunopharmacology
pub_type: 杂志文章
doi:10.1016/j.intimp.2010.10.002
更新日期:2011-01-01 00:00:00
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journal_title:International immunopharmacology
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journal_title:International immunopharmacology
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journal_title:International immunopharmacology
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journal_title:International immunopharmacology
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journal_title:International immunopharmacology
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