title: Production of cytotoxic factor(s) in human T cell lines transformed by a human retrovirus.
abstract: Human T cell lines, MT-2, TCL-Ter, TCL-Haz, and TCL-Kan which were transformed by a human retrovirus, constitutively produced cytotoxic factor(s) (CF) in the culture supernatants. In these cell lines, MT-2 produced the largest amount of CF. The amount of CF produced by MT-2 was 9-10 or 3-4 times larger than that produced by a human B cell line, RPMI 1788, or normal peripheral blood leukocytes stimulated with mitogens and phorbol ester. The kinetics of the production by MT-2 was similar in media with and without serum. The activity was stable at 56 degrees C for 30 min but was lost at 80 degrees C for 30 min and at pH 2 for 20 hr. On gel filtration, the molecular weight of the factor produced by MT-2 was approximately 90,000. On isoelectric focusing, the activity was recovered in the fraction at pH 6.5-7.0.
mesh_terms: D002460:Cell Line; D002471:Cell Transformation, Neoplastic; D003602:Cytotoxicity, Immunologic; D003603:Cytotoxins / Q000096:biosynthesis* / Q000302:isolation & purification; D006801:Humans; D007700:Kinetics; D012190:Retroviridae / Q000235:genetics*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D003603:Cytotoxins