Theaflavin, a black tea extract, is a novel anti-inflammatory compound.

Abstract:

OBJECTIVE:Tea has been around for centuries, and its medicinal properties have been purported in the literature but never fully confirmed. Interleukin-8 is a principle neutrophil chemoattractant and activator in humans. We determined the effects of theaflavin, a black tea-derived polyphenol, on tumor necrosis factor-alpha-mediated expression of the interleukin-8 gene in A549 cells. DESIGN:Prospective laboratory study. SETTING:University laboratory. SUBJECTS:A549 cells. INTERVENTIONS:A549 cells were exposed to varying concentrations of theaflavin and analyzed for tumor necrosis factor-alpha-mediated interleukin-8 gene expression. MEASUREMENTS AND MAIN RESULTS:Theaflavin inhibited tumor necrosis factor-alpha-mediated interleukin-8 gene expression, as measured by luciferase assay and Northern blot analysis, at concentrations of 10 and 30 microg/mL. This effect appears to primarily involve inhibition of interleukin-8 transcription because theaflavin inhibited tumor necrosis factor-alpha-mediated activation of the interleukin-8 promoter in cells transiently transfected with an interleukin-8 promoter-luciferase reporter plasmid. In addition, theaflavin inhibited tumor necrosis factor-alpha-mediated activation of IkappaB kinase and subsequent activation of the IkappaB-alpha/nuclear factor-kappaB pathway. Theaflavin also significantly reduced tumor necrosis factor-alpha-mediated DNA binding of activator protein-1. CONCLUSIONS:We conclude that theaflavin is a potent inhibitor of interleukin-8 gene expression in vitro. The proximal mechanism of this effect involves, in part, inhibition of IkappaB kinase activation and activator protein-1 pathway.

journal_name

Crit Care Med

journal_title

Critical care medicine

authors

Aneja R,Odoms K,Denenberg AG,Wong HR

doi

10.1097/01.ccm.0000142661.73633.15

subject

Has Abstract

pub_date

2004-10-01 00:00:00

pages

2097-103

issue

10

eissn

0090-3493

issn

1530-0293

pii

00003246-200410000-00017

journal_volume

32

pub_type

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