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The Journal of Immunology, Vol 149, Issue 1 103-106, Copyright © 1992 by American Association of Immunologists
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SH Phan, M Gharaee-Kermani, B McGarry, SL Kunkel and FW Wolber
Department of Pathology, University of Michigan Medical School, Ann Arbor 48109.
Recent studies suggest that transforming growth factor-beta (TGF-beta) production is up-regulated at sites of tissue injury, inflammation and repair, or fibrosis. Endothelial cells represent a potentially important in vivo source of TGF-beta; however, the identity of endogenous modulators of TGF-beta production by these cells remains unclear. To address this issue, the effects of the cytokines, IL-1 beta, and TNF-alpha on TGF-beta production by rat pulmonary artery endothelial cells were examined. Conditioned media from cells treated with 0 to 20 ng/ml IL-1 beta and/or TNF-alpha were assayed for TGF-beta activity using a mink lung epithelial cell line. The results show that rat pulmonary artery endothelial cells secreted undetectable amounts of active TGF-beta in the absence of cytokines. However, upon acidification of the conditioned media before assay, a time-dependent increase in TGF-beta activity was noted in media from both untreated and cytokine-treated cells. However, both IL-1 beta and TNF-alpha treatment caused the secretion of significantly greater amounts of TGF- beta activity than control cells, in a dose-dependent manner, with maximal response obtained at cytokine doses of greater than 10 ng/ml. At equivalent doses of cytokine tested, the magnitude of the response was significantly greater with IL-1 beta. These responses were paralleled by increases in steady state mRNA levels for TGF-beta 1. Addition of both cytokines resulted in a synergistic response. Synergism with IL-1 beta was also noted with the fibrogenic agent bleomycin. Kinetic studies indicated that a minimum of 4 h of treatment with either IL-1 beta or TNF-alpha was required for detection of significant increases in either secreted TGF-beta activity or steady state TGF-beta 1 mRNA levels. Thus, endothelial cells could play a role in various TGF-beta-dependent processes in vivo, in situations wherein IL-1 beta and/or TNF-alpha may be present at comparable concentrations.
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