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Am. J. Respir. Cell Mol. Biol., Volume 23, Number 3, September, 2000 345-349

Proliferation of Rat Pleural Mesothelial Cells in Response to Hepatocyte and Keratinocyte Growth Factors

Ian Y. R. Adamson, Julita Bakowska, and Heather Prieditis

Department of Pathology, University of Manitoba, Winnipeg, Manitoba, Canada

The proliferative response of cultured pulmonary mesothelial cells (MCs) to epithelial cell mitogens such as keratinocyte growth factor (KGF) and hepatocyte growth factor (HGF) is investigated. A cell line of rat pleural MCs and freshly prepared rat visceral and parietal MCs were studied. Both KGF and HGF stimulated thymidine uptake in the cell line when cultured for 2 d in serum-free conditions; the growth increase was magnified when tumor necrosis factor (TNF)-alpha was also added to the cultures. Adding asbestos fibers alone to MCs in culture did not enhance DNA synthesis by these cells. The MCs were also shown to synthesize significant amounts of HGF but much less KGF when cultured for 2 d. When freshly prepared MCs were examined, normal cell growth was more rapid in the parietal cells, which also had a more epithelial-type morphology. The addition of HGF and KGF resulted in increased DNA synthesis in each cell type, but no effect of added TNF-alpha was found. The results indicate that pulmonary MCs have the potential to proliferate in response to cytokines such as HGF and KGF that are usually associated with epithelial cell regeneration after injury.




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