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. 1989 Aug;86(16):6171–6175. doi: 10.1073/pnas.86.16.6171

Fibroblast interleukin 1 beta: synergistic stimulation by recombinant interleukin 1 and tumor necrosis factor and posttranscriptional regulation.

J A Elias 1, M M Reynolds 1, R M Kotloff 1, J A Kern 1
PMCID: PMC297799  PMID: 2788284

Abstract

To understand the role fibroblasts play in mediating and amplifying the effects of inflammatory cytokines, we determined whether recombinant interleukin 1 (IL-1) and recombinant tumor necrosis factor (TNF), alone and in combination, stimulated fibroblasts to produce IL-1 beta. Recombinant IL-1 (alpha and beta) stimulated fibroblast IL-1 beta mRNA accumulation, whereas recombinant TNF did not. In addition, simultaneous stimulation with recombinant IL-1 (alpha or beta) and recombinant TNF resulted in a synergistic increase in IL-1 beta mRNA levels. However, in all cases, IL-1 beta mRNA accumulation was not associated with fibroblast production of soluble IL-1 beta protein. Lysates of unstimulated, recombinant IL-1-stimulated, and recombinant TNF-stimulated fibroblasts did not contain IL-1 beta prohormone. In contrast, IL-1 beta prohormone was detected in lysates of fibroblasts incubated simultaneously with recombinant IL-1 and recombinant TNF. These studies demonstrate that recombinant IL-1 stimulates fibroblast IL-1 beta mRNA accumulation and that recombinant IL-1 and recombinant TNF synergize to further up-regulate IL-1 beta mRNA levels. In addition, they show that IL-1 beta production by human lung fibroblasts is inhibited at a posttranscriptional level. Translational control appears to be important in recombinant IL-1-stimulated fibroblasts and posttranslational control is important in fibroblasts stimulated simultaneously with recombinant IL-1 and recombinant TNF.

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