Journal
CLINICAL IMMUNOLOGY
Volume 143, Issue 2, Pages 188-199Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.clim.2012.01.019
Keywords
Inflammation; LPS; Cytokine; Gene expression; Signal transduction; Transcription
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Funding
- Department of Veterans Affairs
- NIH [DE16353]
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To reduce connective tissue IL-6 level stimulated by LPS, it is essential to control IL-6 expression in both mononuclear cells and fibroblasts. However, it is unclear whether the regulatory mechanisms for both cells are similar or not. In this study, we found that signaling pathways mediating LPS-stimulated IL-6 in mononuclear U937 cells and fibroblasts were different. Furthermore, our studies showed that while LPS activated AP-1 and NF kappa B in U937 cells, it only activated NF kappa B in fibroblasts. Analysis of nuclear AP-1 subunits showed that LPS stimulated c-Fos, Fra-1 and Jun D activities in U937 cells, but not fibroblasts. The lack of ERK involvement in LPS-stimulated IL-6 in fibroblasts was further supported by the observations that simvastatin, which is known to target ERK-AP-1, failed to inhibit LPS-stimulated IL-6 by fibroblasts. Finally, we showed that targeting NFKB pathway was highly effective in inhibition of LPS-stimulated IL-6 in coculture of U937 cells and fibroblasts. Published by Elsevier Inc.
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