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J Gen Virol 60 (1982), 15-24; DOI 10.1099/0022-1317-60-1-15
© 1982 Society for General Microbiology
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Protease Inhibitors Suppress Fibrinolytic Activity of Herpesvirus-transformed Cells

Sherrie F. Adelman, Mary K. Howett and Fred Rapp

Department of Microbiology and Specialized Cancer Research Center, The Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033, U.S.A.

Previous studies in this laboratory have quantified the fibrinolytic activity of herpesvirus-transformed cell lines and implicated the proteolytic capacity of cloned cell lines in the formation of primary and metastatic tumours. Because of the involvement of proteases in tumourigenesis in this system, we examined the effect of various protease inhibitors ({alpha}-1-antitrypsin, leupeptin and {alpha}-2-macroglobulin), as well as hamster serum containing acute phase proteins generated in response to physiological trauma, on the fibrinolytic capacity of a herpes simplex virus type 2-transformed hamster cell line. The effects of the various inhibitors on cell growth, fibrinolysis in vitro and tumourigenesis were examined. Leupeptin, {alpha}-1-antitrypsin, {alpha}-2-macroglobulin and hamster serum containing acute phase proteins were capable of inhibiting fibrinolysis in vitro, were not toxic to the cells and their action was reversible, while injection of a mixture of protease inhibitor and transformed cells resulted in delayed tumour development.

Keywords: HSV transformation, protease inhibitors, plasminogen activator, fibrinolysis

Received 28 August 1981; accepted 14 December 1981.




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