NDLI: Transforming Growth Factor-β Inhibits Lipopolysaccharide-Stimulated Expression of Inflammatory Cytokines in Mouse Macrophages through Downregulation of Activation Protein 1 and CD14 Receptor Expression

Content Provider	PubMed Central
Author	Imai, Kenichi Takeshita, Akira Hanazawa, Shigemasa
Editor	Moore, R. N.
Copyright Year	2000
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-β1 (TGF-β1) inhibits this septic shock through suppression of expression of the lipopolysaccharide (LPS)-induced inflammatory cytokines. In this study, we investigated whether TGF-β1 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-β1 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-β1 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-β1 inhibition of CD14 expression may be a consequence of downregulation of AP-1. LPS-stimulated expression of interleukin-1β and tumor necrosis factor alpha genes in the cells was inhibited by addition of CD14 antisense oligonucleotide. Also, TGF-β1 inhibited the LPS-stimulated production of both inflammatory cytokines by the macrophages. In addition, TGF-β1 inhibited expression of the two cytokines in several organs of mice receiving LPS. Thus, our results suggest that TGF-β1 inhibition of LPS-stimulated inflammatory responses resulted from downregulation of CD14 and also may be a possible mechanism of TGF-β1 inhibition of LPS-induced septic shock.
Starting Page	2418
File Format	PDF
ISSN	10985522
e-ISSN	10985522
Journal	Infection and Immunity
Issue Number	5
Volume Number	68
Language	English
Publisher	American Society for Microbiology
Publisher Date	2000-05-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Parasitology Immunology Microbiology

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