title: A novel cell growth-promoting factor identified in a B cell leukemia cell line, BALL-1.
abstract: A novel leukemia cell growth-promoting activity has been identified in the culture supernatant from a human B cell leukemia cell line, BALL-1. The supernatant from unstimulated cultures of the BALL-1 cells significantly promoted the growth of 16 out of 24 leukemia/lymphoma cell lines of different lineages (T, B and non-lymphoid) in a minimal concentration of fetal bovine serum (FBS), and of 5 out of 12 cases of fresh leukemia cells in FBS-free medium. The growth-promoting activity in the BALL-1 supernatant has been further characterized using FPLC chromatography, molecular weight (MW) sieve filtration and dialysis. The MW of the factor was less than 10 kDa. The growth-promoting activity was heat and acid stable and resistant to trypsin treatment. The factor isolated from the BALL-1 supernatant was distinct from known polypeptide growth factors with MW below 10 kDa, such as epidermal growth factor, transforming growth factor alpha, insulin-like growth factor I (IGF-I), IGF-II and insulin, as determined by specific antibodies and by cell growth-promoting tests. The factor in the BALL-1 supernatant did not promote the proliferation of normal human fresh peripheral blood lymphocytes or mouse fibroblast cell line, BALB/c3T3. In addition to the BALL-1 supernatant, a similar growth-promoting activity was found in the culture supernatants from 13 of 17 leukemia/lymphoma cell lines tested. The activity in these culture supernatants promoted the growth of leukemia/lymphoma cell lines in autocrine and/or paracrine fashions. These observations suggest that the low MW cell growth-promoting activity found in the BALL-1 culture supernatant is mediated by a novel factor which may well be responsible for the clonal expansion of particular leukemic clones.
authors.affiliation: Fujisaki Cell Center, Hayashibara Biochemical Laboratories, Inc., Okayama, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Dao
authors.forename: V
authors.initials: V
authors.lastname: Holán
authors.forename: J
authors.initials: J
authors.lastname: Minowada
mesh_terms: D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D003470:Culture Media; D004815:Epidermal Growth Factor / Q000494:pharmacology; D006133:Growth Substances / Q000032:analysis* / Q000096:biosynthesis / Q000494:pharmacology; D006801:Humans; D007328:Insulin / Q000494:pharmacology; D007334:Insulin-Like Growth Factor I / Q000494:pharmacology; D007335:Insulin-Like Growth Factor II / Q000494:pharmacology; D007938:Leukemia; D015448:Leukemia, B-Cell; D008223:Lymphoma; D011994:Recombinant Proteins / Q000494:pharmacology; D014407:Tumor Cells, Cultured
chemical_list: D003470:Culture Media; D006133:Growth Substances; D007328:Insulin; D011994:Recombinant Proteins; D004815:Epidermal Growth Factor; D007334:Insulin-Like Growth Factor I; D007335:Insulin-Like Growth Factor II