title: The influence of stromal cells on the MTT assay (I)--In vitro chemosensitivity of the tumor and stromal cells to mitomycin C.
abstract: To clarify the influence of stromal cells on the 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H tetrazolium bromide assay (MTT assay), a gastric carcinoma cell line (KATO-III) and a human fibroblast cell line (IMR-90) were subjected to a colorimetric assay, in which the chemosensitivity KATO-III was found to be highly sensitive to mitomycin C at 10 micrograms/ml, whereas IMR-90 was insensitive to mitomycin C at the same concentration. When the mixtures of these two cell lines were tested by the assay, a mixture of more than 25 per cent stromal cells reduced the sensitivity of KATO-III to mitomycin C. This suggested that the stromal cells in fresh surgical specimens might reduce the apparent sensitivity of the tumor cells.
authors.affiliation: Department of Surgery, School of Medicine, Keio University, Tokyo, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Suto
mesh_terms: D004354:Drug Screening Assays, Antitumor; D006801:Humans; D016685:Mitomycin; D008937:Mitomycins / Q000627:therapeutic use*; D013274:Stomach Neoplasms / Q000473:pathology*; D013778:Tetrazolium Salts; D013844:Thiazoles; D014410:Tumor Stem Cell Assay
chemical_list: D008937:Mitomycins; D013778:Tetrazolium Salts; D013844:Thiazoles; D016685:Mitomycin; C022616:thiazolyl blue