title: New xenografts of human megakaryoblastic cell line (MEG-01) for evaluating anti-tumor agents.
abstract: A human megakaryoblastic cell line (MEG-01) was successfully transplanted into athymic nude mice. MEG-01 cells (5 x 10(7)) were inoculated subcutaneously in KSN-nu/nu mice, none of which were pretreated with irradiation or chemotherapeutic agents. All mice developed solid tumors at the site of injection after incubation for 10-14 days reaching a size of 200-400 mm2 (product of cross-sectional diameters) after 30 days. These tumors, designated as MEG-01/nu, were transplanted into other nude mice. The transplanted tumors infiltrated the liver and spleen, and leukemic megakaryoblastic cells appeared in the blood of some transplanted mice. Cells resuspended from MEG-01/nu tumors exhibited almost the same megakaryocytic characteristics as the original MEG-01 cells, and underwent in vitro differentiation to a mature form of megakaryocyte upon addition of phorbol diesters. MEG-01/nu was evaluated for sensitivity to cytosine arabinoside, vincristine, and daunorubicin in vitro and in vivo. Daunorubicin exhibited significant anti-tumor activity against MEG-01/nu in vivo, while cytosine arabinoside did so in vitro. Vincristine showed no activity against these cells. This cell line may provide a useful model for testing the in vivo efficacy of anti-tumor agents and immunotoxins, and for studying the pathophysiological mechanisms of human megakaryoblastic leukemia.
authors.affiliation: First Department of Internal Medicine, Nagoya University School of Medicine, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Takeo
authors.forename: M
authors.initials: M
authors.lastname: Ogura
authors.forename: M
authors.initials: M
authors.lastname: Okumura
authors.forename: Y
authors.initials: Y
authors.lastname: Morishima
authors.forename: N
authors.initials: N
authors.lastname: Hirabayashi
authors.forename: J
authors.initials: J
authors.lastname: Kitoh
authors.forename: H
authors.initials: H
authors.lastname: Saito
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D003561:Cytarabine / Q000494:pharmacology; D003630:Daunorubicin / Q000494:pharmacology; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D007947:Leukemia, Megakaryoblastic, Acute / Q000473:pathology*; D008297:Male; D051379:Mice; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D014183:Transplantation, Heterologous; D014407:Tumor Cells, Cultured / Q000187:drug effects; D014750:Vincristine / Q000494:pharmacology
chemical_list: D000970:Antineoplastic Agents; D003561:Cytarabine; D014750:Vincristine; D003630:Daunorubicin