title: Immunization with murine breast cancer cells treated with antisense oligodeoxynucleotides to type I insulin-like growth factor receptor induced an antitumoral effect mediated by a CD8+ response involving Fas/Fas ligand cytotoxic pathway.
abstract: We have demonstrated that in vivo administration of phosphorothioate antisense oligodeoxynucleotides (AS[S]ODNs) to type I insulin-like growth factor receptor (IGF-IR) mRNA resulted in inhibition of C4HD breast cancer growth in BALB/c mice. The present study focused on whether in vivo administration of C4HD tumor cells pretreated with IGF-IR AS[S]ODN and irradiated could provide protection against C4HD wild-type tumor challenge and also on elucidating the mechanism mediating this effect. Our results showed that mice immunized with IGF-IR AS[S]ODN-treated C4HD cells experienced a growth inhibition of 53.4%, 61.6%, and 60.2% when compared with PBS-treated mice, wild-type C4HD cell-injected mice, or phosphorothioate sense oligodeoxynucleotide-treated C4HD cell-injected mice, respectively. The protective effect was C4HD-specific, because no cross-protection was observed against other syngeneic mammary tumor lines. The lack of protection against tumor formation in nude mice indicated that T cells were involved in the antitumoral response. Furthermore, cytotoxicity and splenocyte proliferation assays demonstrated that a cellular CD8(+)-dependent immune response, acting through the Fas/Fas ligand death pathway, could be mediating the antitumor effect induced by immunization with AS[S]ODN-treated cells. Immunization also induced splenocytes to produce Ag-dependent IFN-gamma, indicating the presence of a type 1 response. We demonstrated for the first time that IGF-IR AS[S]ODN treatment of breast cancer cells induced expression of CD86 and heat shock protein 70 molecules, both involved in the induction of the immunogenic phenotype. Immunization with these tumor immunogens imparted protection against parental tumor growth through activation of a specific immune response.
authors.affiliation: Instituto de Biología y Medicina Experimental, Consejo Nacional de Investigaciones Científicas y Técnicas de Argentina, Vuelta de Obligado 2490, Buenos Aires C1428ADN, Argentina.
authors.forename: Roxana
authors.initials: R
authors.lastname: Schillaci
authors.forename: Mariana
authors.initials: M
authors.lastname: Salatino
authors.forename: Juliana
authors.initials: J
authors.lastname: Cassataro
authors.forename: Cecilia J
authors.initials: CJ
authors.lastname: Proietti
authors.forename: Guillermo H
authors.initials: GH
authors.lastname: Giambartolomei
authors.forename: Martín A
authors.initials: MA
authors.lastname: Rivas
authors.forename: Romina P
authors.initials: RP
authors.lastname: Carnevale
authors.forename: Eduardo H
authors.initials: EH
authors.lastname: Charreau
authors.forename: Patricia V
authors.initials: PV
authors.lastname: Elizalde
mesh_terms: D000818:Animals; D017209:Apoptosis; D051940:B7-2 Antigen / Q000378:metabolism; D001943:Breast Neoplasms / Q000235:genetics / Q000276:immunology* / Q000378:metabolism / Q000473:pathology*; D019496:Cancer Vaccines / Q000276:immunology; D049109:Cell Proliferation; D002478:Cells, Cultured; D053222:Fas Ligand Protein; D005260:Female; D018840:HSP70 Heat-Shock Proteins / Q000378:metabolism; D007114:Immunization; D007371:Interferon-gamma / Q000096:biosynthesis; D008562:Membrane Glycoproteins / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D009368:Neoplasm Transplantation; D020319:Oligodeoxyribonucleotides, Antisense / Q000235:genetics; D010641:Phenotype; D017526:Receptor, IGF Type 1 / Q000172:deficiency* / Q000235:genetics / Q000378:metabolism; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology* / Q000378:metabolism; D048069:Tumor Necrosis Factors / Q000378:metabolism*; D019014:fas Receptor / Q000378:metabolism*
chemical_list: D051940:B7-2 Antigen; D019496:Cancer Vaccines; D053222:Fas Ligand Protein; C505658:Fasl protein, mouse; D018840:HSP70 Heat-Shock Proteins; D008562:Membrane Glycoproteins; D020319:Oligodeoxyribonucleotides, Antisense; D048069:Tumor Necrosis Factors; D019014:fas Receptor; D007371:Interferon-gamma; D017526:Receptor, IGF Type 1