title: Human tissue-type plasminogen activator. Production in continuous serum-free cell culture and rapid purification.
abstract: A simplified procedure for the production and purification of human tissue-type plasminogen activator (t-PA) is described. Bowes-melanoma cells were maintained in continuous serum-free culture. The cell nutrient consisted of Dulbecco's modified Eagle's medium (DMEM) supplemented with insulin (5 mg/litre), transferrin (5 mg/litre), progesterone (1 nM), cortisol (10 nM), aprotinin (2 X 10(4) units/litre) and a mixture of trace elements. t-PA accumulated in the culture medium at a rate of 40 units/day per ml and was harvested every third day. Cell losses during each harvest, leading to a steady decline of enzyme yields, were compensated for by treating the cells with 5% (v/v) fetal-bovine serum in DMEM every 6-8 weeks. t-PA was rapidly purified by a combination of cation-exchange chromatography and gel filtration. The procedure yielded mainly single-chain t-PA of a specific activity of 80 000 to 100 000 units/mg.
mesh_terms: D001769:Blood; D002478:Cells, Cultured; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D003470:Culture Media; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D008545:Melanoma / Q000378:metabolism; D010960:Plasminogen Activators / Q000302:isolation & purification*
chemical_list: D003470:Culture Media; D010960:Plasminogen Activators