Coordinate regulation of transforming growth factor beta gene expression and cell proliferation in hamster lungs undergoing bleomycin-induced pulmonary fibrosis.

The Journal of Clinical Investigation
B RaghowA H Kang

Abstract

The number of mesenchymal cells, as well as their ability to synthesize extracellular matrix (ECM) components, greatly increase in the interstitium of fibrotic lungs. We have previously shown that the transcription of type I procollagen and fibronectin genes in the lungs is preferentially elevated during the early stages of bleomycin-induced pulmonary fibrosis (Raghow, R., S. Lurie, J. M. Seyer, and A. H. Kang. 1985, J. Clin. Invest. 76:1734-1739. Since a cytokine-like transforming growth factor beta (TGF beta) that is capable of enhancing mesenchymal cell proliferation and ECM synthesis could be potentially involved in this process, we investigated the temporal relationship between the regulation of TGF beta gene transcription and cellular proliferation in the bleomycin-treated hamster lungs. We observed a transient 5-7-fold increase in the accumulation of TGF beta transcripts, a concomitant 3-4-fold elevation in the cellular proliferation, and 8-10-fold stimulation of DNA synthesis in these lungs; all three parameters peaked around day 10 after bleomycin administration. Based on these results, we conclude that regulation of TGF beta gene expression may contribute significantly to the early events that lead to bleomycin-induce...Continue Reading

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