title: Combination of CD80 and granulocyte-macrophage colony-stimulating factor coexpression by a leukemia cell vaccine: preclinical studies in a murine model recapitulating Philadelphia chromosome-positive acute lymphoblastic leukemia.
abstract: Philadelphia chromosome-positive acute lymphoblastic leukemia (Ph+ ALL) is a highly aggressive malignancy caused by the bcr-abl translocation oncogene. To explore alternative treatments for Ph+ ALL we tested gene-modified cell vaccines in the BALB/c-derived BM185 leukemia model. We compared the efficacy of BM185 cell vaccine expressing CD80 alone or in combination with IL-2 or GM-CSF. Mice injected with viable BM185 leukemia cells modified to express CD80 and GM-CSF (BM185/CD80+GM-CSF) showed the highest leukemia rejection rates. Cell vaccines consisting of irradiated BM185/CD80+GM-CSF cells administered subcutaneously stimulated a potent cytotoxic T lymphocyte (CTL) response against parental BM185. Histological examination of the vaccination site showed a large concentration of immune cells. Administration of the BM185/CD80+GM-CSF cell vaccine before intravenous challenge with parental cells caused strong inhibition of leukemia development. Vaccination after subcutaneous challenge with BM185 cells caused efficient elimination of leukemia promoting 40-60% long-term survival rates. The immunization efficacy of the BM185/CD80+ GM-CSF cell vaccine was directly correlated with the percentage of cells expressing the transgenes. In all, this preclinical study shows that leukemia cell vaccines coexpressing CD80 and GM-CSF can potentially be explored for immunotherapy in Ph+ ALL patients.
authors.affiliation: Division of Research Immunology/BMT, Childrens Hospital Los Angeles, CA 90027, USA.
authors.forename: R
authors.initials: R
authors.lastname: Stripecke
authors.forename: D C
authors.initials: DC
authors.lastname: Skelton
authors.forename: P K
authors.initials: PK
authors.lastname: Pattengale
authors.forename: H
authors.initials: H
authors.lastname: Shimada
authors.forename: D B
authors.initials: DB
authors.lastname: Kohn
mesh_terms: D000818:Animals; D000938:Antigen-Presenting Cells / Q000276:immunology; D018122:B7-1 Antigen / Q000378:metabolism*; D019496:Cancer Vaccines / Q000378:metabolism / Q000528:radiation effects / Q000627:therapeutic use*; D002460:Cell Line; D003602:Cytotoxicity, Immunologic; D018014:Gene Transfer Techniques; D015316:Genetic Therapy; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000378:metabolism*; D006801:Humans; D007150:Immunohistochemistry; D007167:Immunotherapy; D007376:Interleukin-2 / Q000378:metabolism; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008854:Microscopy, Electron; D009368:Neoplasm Transplantation; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000276:immunology / Q000628:therapy*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology
chemical_list: D018122:B7-1 Antigen; D019496:Cancer Vaccines; D007376:Interleukin-2; D016178:Granulocyte-Macrophage Colony-Stimulating Factor