The anti-inflammatory activity of Phellinus linteus (Berk. & M.A. Curt.) is mediated through the PKCdelta/Nrf2/ARE signaling to up-regulation of heme oxygenase-1.

Abstract:

:It has been reported that heme oxygenase-1 (HO-1) mediates the anti-inflammatory activity of the n-BuOH subfraction (PL) prepared from fruiting bodies of Phellinus linteus. This continuing work aimed to elucidate the signaling pathway to the up-regulation of HO-1 by PL. In RAW264.7 macrophage cells, PL was able to enhance phosphorylation of protein kinase Cdelta (PKCdelta), but not PKCalpha/betaII, in a time-dependent manner. PL-induced HO-1 expression was dramatically released by GF109203X, a general inhibitor of PKC, and rottlerin, a specific PKCdelta inhibitor but not by Gö6976, a selective inhibitor for PKCalpha/beta. Additionally, PL treatment resulted in a marked increase in antioxidant response element (ARE)-driven transcriptional activity, which was dependent on PKCdelta but not PKCalpha. An increase by PL treatment in the ARE-driven transcriptional activity was further enhanced by Nrf2, whereas it was diminished by Keap1. Furthermore, pretreatment of rottlerin and overexpression of PKCdelta (K376R), a kinase-inactive form of PKCdelta, partly blocked the suppression by PL of nitric oxide (NO) production and inducible nitric oxide synthase (iNOS) expression, and iNOS promoter activity, which were elevated in the lypopolysaccharide (LPS)-activated macrophages. Similarly, expression of matrix metalloproteinase-9 (MMP-9) and its promoter activity were suppressed by PL, which were dependent upon PKCdelta. The present findings indicate that Phellinus linteus gives rise to an anti-inflammatory activity though the PKCdelta/Nrf2/ARE signaling to the up-regulation of HO-1 in an in vitro inflammation model.

journal_name

J Ethnopharmacol

authors

Kim BC,Jeon WK,Hong HY,Jeon KB,Hahn JH,Kim YM,Numazawa S,Yosida T,Park EH,Lim CJ

doi

10.1016/j.jep.2007.05.032

subject

Has Abstract

pub_date

2007-09-05 00:00:00

pages

240-7

issue

2

eissn

0378-8741

issn

1872-7573

pii

S0378-8741(07)00276-0

journal_volume

113

pub_type

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