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Journal Article | Research Support, U.S. Gov't, P.H.S.

Role of tumor necrosis factor alpha in induction of murine CD14 gene expression by lipopolysaccharide.

C Fearns, D J Loskutoff
C Fearns
Department of Vascular Biology, The Scripps Research Institute, La Jolla, California 92037, USA.
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D J Loskutoff
Department of Vascular Biology, The Scripps Research Institute, La Jolla, California 92037, USA.
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ABSTRACT

We previously demonstrated CD14 gene expression in myeloid and epithelial cells of the mouse and showed that expression of the CD14 gene in both is modulated by lipopolysaccharide (LPS). Here we test the hypothesis that the induction of CD14 in these cells is an indirect effect of LPS, one mediated by tumor necrosis factor alpha (TNF-alpha). TNF-alpha induced a transient increase in levels of CD14 in plasma with a peak at 6 to 8 h, and this increase in levels of CD14 antigen in plasma was accompanied by increased levels of CD14 mRNA in lung, liver, and kidney. Moreover, in situ hybridization studies revealed that CD14 mRNA was induced in both myeloid cells and epithelial cells, the same cells that respond to LPS. Pretreatment of mice with anti-TNF antiserum reduced the LPS-mediated increase in levels of CD14 in plasma and significantly reduced the level of induction of CD14 mRNA in selected epithelial cells in the kidney and liver. The antiserum did not appear to block LPS-mediated induction in myeloid cells in the tissues examined. In C3H/HeJ mice, the epithelial response to LPS was markedly attenuated whereas the response to TNF-alpha was normal. Thus, regulation of CD14 gene expression by LPS differs in epithelial and myeloid cells, with the epithelial responses in kidney and liver being mediated, in part, by TNF-alpha.

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Role of tumor necrosis factor alpha in induction of murine CD14 gene expression by lipopolysaccharide.
C Fearns, D J Loskutoff
Infection and Immunity Nov 1997, 65 (11) 4822-4831; DOI:

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Role of tumor necrosis factor alpha in induction of murine CD14 gene expression by lipopolysaccharide.
C Fearns, D J Loskutoff
Infection and Immunity Nov 1997, 65 (11) 4822-4831; DOI:
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