The Journal of Immunology, Vol 146, Issue 4 1212-1215, Copyright © 1991 by American Association of Immunologists

ARTICLES

Dexamethasone inhibits the induction of monocyte chemotactic-activating factor production by IL-1 or tumor necrosis factor

N Mukaida, CC Zachariae, GL Gusella and K Matsushima
Laboratory of Biochemical Physiology, National Cancer Institute, Frederick Cancer Research and Development Center, MD 21702-1201.

Recently purified and molecularly cloned monocyte chemotactic and activating factor (MCAF) may play a major role in recruiting and activating monocytes in the inflammatory process. We examined the effects of a potent anti-inflammatory agent, dexamethasone (DXS), on the production of this factor. Over a wide range of concentrations (10(- 5) to 10(-8) M), DXS inhibited the production of MCAF at the mRNA and protein level in a human fibrosarcoma cell line, which was stimulated with either IL-1 or TNF-alpha. We examined the turn-over of synthesized MCAF mRNA that showed DXS decreased the stability of MCAF mRNA. Furthermore, the addition of actinomycin D and cycloheximide abolished this effect of DXS, indicating that de novo mRNA and protein synthesis were required for this process. In addition, a nuclear run-off analysis revealed that DXS also inhibited the transcription of IL-1- or TNF- activated MCAF genes. Therefore, both the destabilization of MCAF mRNA and the inhibition of transcription of the gene contribute to the decrease in the MCAF mRNA steady state level by DXS.

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