Tetrandrine inhibits proinflammatory cytokines, iNOS and COX-2 expression in human monocytic cells.

Abstract:

:Tetrandrine (TET), a bis-benzylisoquinoline alkaloid isolated from the dried root of hang-fang-chi (Stephania tetrandra S. Moore), is traditionally used in China for treating inflammation, hypertension and silicosis. In this study, our aim was to examine the anti-inflammatory mechanism of TET through measuring the inducible nitric oxide synthase (iNOS), cyclooxygenase-1, and -2 (COX-1 and COX-2) expression, cytokines (TNF-alpha, IL-4 and IL-8) formation, nitric oxide (NO) release and prostaglandin E2 (PGE2) generation in lipopolysaccharide (LPS)-induced human monocytic (THP-1) cells. Results showed that TET remarkably suppressed the LPS (1 microg/ml) induction of NO release and PGE2 generation. It also significantly attenuated the LPS-induced transcription of proinflammatory cytokines (TNF-alpha, IL-4 and IL-8) in a dose-dependent manner. Furthermore, TET at 100 microM significantly blocked the LPS induction of iNOS and COX-2 expression, but not the COX-1. Taken together, these results suggest that TET exerts anti-inflammatory effects probably through the suppression of COX-2 and iNOS expression.

journal_name

Biol Pharm Bull

authors

Wu SJ,Ng LT

doi

10.1248/bpb.30.59

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

59-62

issue

1

eissn

0918-6158

issn

1347-5215

pii

JST.JSTAGE/bpb/30.59

journal_volume

30

pub_type

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