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The Journal of Immunology, Vol 155, Issue 6 3145-3151, Copyright © 1995 by American Association of Immunologists
ARTICLES |
G Cosentino, E Soprana, CP Thienes, AG Siccardi, G Viale and D Vercelli
Molecular Immunoregulation Unit, DIBIT/San Raffaele Scientific Institute, Milan, Italy.
CD14, a glycosylphosphatidylinositol (GPI)-linked protein expressed on monocytes and neutrophils, regulates monocyte-lymphocyte interactions and serves as the LPS receptor. We showed previously that IL-4 down- regulates the expression of human CD14 by acting at the transcriptional level. We now investigate whether CD14 expression could also be regulated by IL-13, another member of the chromosome 5 cytokine gene family. IL-13 dose-dependently inhibited CD14 expression on human monocytes. By contrast, expression of CD23 and CD11b was enhanced strongly. Down-regulation of CD14 involved neither shedding nor activation of endogenous GPI anchor-cleaving enzymes. Indeed, soluble CD14 was not increased in the supernatants of IL-13-stimulated monocytes, and expression of CD55/DAF, another GPI-linked protein, was unaffected by IL-13. CD14 transcript levels were reduced sixfold in IL- 13-treated monocytes. These results suggest that IL-13 down-regulates membrane CD14 by suppressing CD14 RNA expression. IL-13-dependent down- regulation of CD14 resulted in the inhibition of CD14-mediated events. Indeed, CD14-mediated release of TNF-alpha was inhibited markedly (approximately 75%) in monocytes stimulated with LPS (100 ng/ml) after a 72-h preincubation with IL-13. However, IL-13 also directly inhibited monokine secretion, because it blocked PMA-induced, CD14-independent TNF-alpha release. Down-regulation of CD14 and TNF-alpha secretion may play a major role in the anti-inflammatory effects of IL-13 on LPS- stimulated monocytes.
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