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Int Immunopharmacol. 2004 Mar;4(3):377-86.

Penta-O-galloyl-beta-D-glucose inhibits phorbol myristate acetate-induced interleukin-8 [correction of intereukin-8] gene expression in human monocytic U937 cells through its inactivation of nuclear factor-kappaB.

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  • 1Department of Microbiology and Immunology, Wonkwang University School of Medicine, 344-2 Shinyong-Dong, Iksan-Shi, Chonbuk 570-749, South Korea.

Abstract

We investigated the effects of the gallotannin penta-O-galloyl-beta-d-glucose (PGG) on interleukin (IL)-8 gene expression and nuclear factor (NF)-kappaB activation. PGG inhibited IL-8 production and gene expression in human monocytic U937 cells stimulated with phorbol myristate acetate (PMA), as measured by enzyme-linked immunosorbent assay and reverse transcription-polymerase chain reaction analysis, respectively. PGG also inhibited PMA-mediated NF-kappaB activation, as measured by electromobility shift assay. Furthermore, PGG prevented PMA-mediated degradation of the NF-kappaB inhibitory protein I-kappaBalpha, as measured by Western blot analysis. PGG also inhibited both IL-8 production and NF-kappaB activation in the U937 cells stimulated with tumor necrosis factor-alpha. These results suggest that PGG, a major constituent of the root cortex of Paeonia suffruticosa ANDREWS, can inhibit IL-8 gene expression by a mechanism involving its inhibition of NF-kappaB activation, which is dependent on I-kappaBalpha degradation.

[PubMed - indexed for MEDLINE]
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