title: Augmentation of anti-tumor effects of methotrexate by distilled water on Dunn osteosarcoma in mouse air pouch.
abstract: The anti-tumor effects of hypoosmotic solution of MTX in distilled water (DW) on Dunn osteosarcoma were evaluated in mouse air pouches. Dunn osteosarcoma cell suspension (1 x 10[5] cells in 0.1 ml of medium) was inoculated into the mouse subcutaneous air pouch that had formed 7 days after the initial injection of air. Two hours after the inoculation of tumor cells, 5 ml of various concentrations of MTX (from 0 to 1 x 10[-3] M) dissolved in DW or PBS were injected into the air pouch. Five minutes later, the entire solution in the air pouch was aspirated. The mice were sacrificed 3 weeks after the inoculation of tumor cells and the air-pouch tissue was transected in the coronal plane with the largest area of tumor mass. The sections were stained with H&E and the area was measured with the NIH Image program. The largest area of tumor mass in the air pouch treated with 1 x 10(-3) M of MTX in DW was 11.8+/-3.4 mm2 (N = 5), which was significantly (P < 0.005) smaller than that in PBS (51.7+/-8.3 mm2). These findings suggested that hypoosmotic solution in DW might augment the anti-tumor effect of MTX on sarcoma cells.
authors.affiliation: Department of Orthopaedic Surgery, Yokohama City University School of Medicine, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yoshida
authors.forename: T
authors.initials: T
authors.lastname: Koshino
authors.forename: T
authors.initials: T
authors.lastname: Saito
authors.forename: T
authors.initials: T
authors.lastname: Takagi
mesh_terms: D000818:Animals; D000964:Antimetabolites, Antineoplastic / Q000627:therapeutic use*; D001859:Bone Neoplasms / Q000188:drug therapy* / Q000473:pathology; D004357:Drug Synergism; D008297:Male; D008727:Methotrexate / Q000627:therapeutic use*; D051379:Mice; D008809:Mice, Inbred C3H; D012516:Osteosarcoma / Q000188:drug therapy* / Q000473:pathology; D012996:Solutions; D014867:Water / Q000494:pharmacology*
chemical_list: D000964:Antimetabolites, Antineoplastic; D012996:Solutions; D014867:Water; D008727:Methotrexate