Transforming Growth Factor-beta Inhibits Lipopolysaccharide-stimulated Expression of Inflammatory Cytokines in Mouse Macrophages Through Downregulation of Activation Protein 1 and CD14 Receptor Expression

Overview

Journal Infect Immun

Publisher American Society for Microbiology

Specialty Allergy & Immunology

Date 2000 Apr 18

PMID 10768925

Citations 20

Authors

K Imai

A Takeshita

S Hanazawa

Affiliations

Soon will be listed here.

Abstract

The septic shock that occurs in gram-negative infections is caused by a cascade of inflammatory cytokines. Several studies showed that transforming growth factor-beta1 (TGF-beta1) inhibits this septic shock through suppression of expression of the lipopolysaccharide (LPS)-induced inflammatory cytokines. In this study, we investigated whether TGF-beta1 inhibition of LPS-induced expression of inflammatory cytokines in the septic shock results from downregulation of LPS-stimulated expression of CD14, an LPS receptor. TGF-beta1 markedly inhibited LPS stimulation of CD14 mRNA and protein levels in mouse macrophages. LPS-stimulated expression of CD14 was dramatically inhibited by addition of antisense, but not sense, c-fos and c-jun oligonucleotides. Since TGF-beta1 pretreatment inhibited LPS-stimulated expression of c-fos and c-jun genes and also the binding of nuclear proteins to the consensus sequence of the binding site for activation protein 1 (AP-1), a heterodimer of c-Fos and c-Jun, in the cells, TGF-beta1 inhibition of CD14 expression may be a consequence of downregulation of AP-1. LPS-stimulated expression of interleukin-1beta and tumor necrosis factor alpha genes in the cells was inhibited by addition of CD14 antisense oligonucleotide. Also, TGF-beta1 inhibited the LPS-stimulated production of both inflammatory cytokines by the macrophages. In addition, TGF-beta1 inhibited expression of the two cytokines in several organs of mice receiving LPS. Thus, our results suggest that TGF-beta1 inhibition of LPS-stimulated inflammatory responses resulted from downregulation of CD14 and also may be a possible mechanism of TGF-beta1 inhibition of LPS-induced septic shock.

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