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The Journal of Immunology, Vol 146, Issue 10 3437-3443, Copyright © 1991 by American Association of Immunologists

ARTICLES

Transforming growth factor-beta regulation of IL-6 production by unstimulated and IL-1-stimulated human fibroblasts [published erratum appears in J Immunol 1991 Aug 15;147(4):1460]

JA Elias, V Lentz and PJ Cummings
Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06510.

We characterized the ability of transforming growth factor-beta 1 (TGF- beta 1) and transforming growth factor-beta 2 (TGF-beta 2) to regulate IL-6 production by unstimulated and rIL-1-stimulated lung fibroblasts. rTGF-beta 1-, purified TGF-beta 1-, and purified TGF-beta 2-stimulated fibroblasts produced IL-6 bioactivity as assessed with the B9 hybridoma proliferation assay. These TGF-beta moieties also bidirectionally regulated the IL-6 production of rIL-1-stimulated fibroblasts. The addition of TGF-beta to cultures in which fibroblasts were vigorously stimulated with rIL-1 resulted in an inhibition of fibroblast IL-6 production and mRNA accumulation. In contrast, the addition of TGF-beta to cultures in which fibroblasts were incubated with suboptimal concentrations of rIL-1 resulted in a synergistic increase in IL-6 production and mRNA accumulation [corrected]. Nuclear run-on analysis demonstrated that IL-6 gene [corrected] transcription was synergistically augmented when rTGF-beta 1 was combined with suboptimal concentrations of rIL-1. These studies demonstrate that TGF-beta stimulates fibroblast IL-6 production. They also show that TGF-beta can augment or inhibit the IL-6 production of IL-1-stimulated fibroblasts. Lastly, [corrected] they demonstrate that the stimulatory effects of TGF-beta are, at least partially, mediated by alterations in IL-6 gene transcription. TGF-beta may be an important regulator of IL-6 production. stimulated fibroblasts. Last, they demonstrate that the stimulatory effects of TGF-beta are, at least partially, mediated by alterations in IL-6 gene transcription. TGF-beta may be an important regulator of IL-6 production.


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