title: Tumor protection following vaccination with low doses of lentivirally transduced DCs expressing the self-antigen erbB2.
abstract: Gene therapy strategies may accelerate the development of prophylactic immunotherapy against cancer. We synthesized a lentiviral (LV) vector encoding a kinase-deficient form of erbB2 (erbB2tr) to transduce murine dendritic cells (DCs) efficiently. Murine erbB2 models a clinically relevant tumor-associated self-antigen; its human homolog (HER-2/neu) is overexpressed in breast cancer and in 80% of metastatic prostate cancers. Following one infection, approximately 47% of DCs overexpressed erbB2tr. To determine whether low doses of transduced DCs could protect mice from prostate cancer cells, we performed prime/boost vaccinations with 2 x 10(3) or 2 x 10(5) erbB2tr-transduced DCs. Six weeks after vaccination, mice were simultaneously bilaterally challenged with the aggressive RM-1 prostate cancer cell line and an erbB2tr-expressing variant (RM-1-erbB2tr). Whereas control mice developed both tumors, all recipients of 2 x 10(5) erbB2tr-transduced DCs developed only wild-type RM-1 tumors. One-third of mice vaccinated with just 2 x 10(3) erbB2tr-transduced DCs also demonstrated erbB2tr-specific tumor protection. Protection against RM-1-erbB2tr tumors was associated with sustained levels of anti-erbB2tr antibody production and also correlated with erbB2tr-specific Th1 cytokine secretion. Depletion of CD4(+), CD8(+), or natural killer (NK) cells prior to tumor challenge underscored their role in mediating tumor protection. We conclude that administration of DCs expressing a self-antigen through efficient LV-based gene transfer activates cellular and humoral immunity, protecting host animals against specific tumor challenge.
authors.affiliation: Department of Medical Biophysics, University of Toronto, Toronto, Ontario,Canada.
authors.forename: Miriam E
authors.initials: ME
authors.lastname: Mossoba
authors.forename: Jagdeep S
authors.initials: JS
authors.lastname: Walia
authors.forename: Vanessa I
authors.initials: VI
authors.lastname: Rasaiah
authors.forename: Nicole
authors.initials: N
authors.lastname: Buxhoeveden
authors.forename: Renee
authors.initials: R
authors.lastname: Head
authors.forename: Chuyan
authors.initials: C
authors.lastname: Ying
authors.forename: Jason E
authors.initials: JE
authors.lastname: Foley
authors.forename: Jonathan L
authors.initials: JL
authors.lastname: Bramson
authors.forename: Daniel H
authors.initials: DH
authors.lastname: Fowler
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Medin
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D019496:Cancer Vaccines / Q000235:genetics / Q000276:immunology; D045744:Cell Line, Tumor; D016207:Cytokines / Q000378:metabolism; D003713:Dendritic Cells / Q000276:immunology* / Q000378:metabolism / Q000637:transplantation; D005260:Female; D005434:Flow Cytometry; D015316:Genetic Therapy / Q000379:methods; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D016219:Immunotherapy, Adoptive / Q000379:methods; D007694:Killer Cells, Natural / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D016086:Lentivirus / Q000235:genetics*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D011471:Prostatic Neoplasms / Q000235:genetics / Q000473:pathology / Q000628:therapy*; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000235:genetics* / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D013154:Spleen / Q000166:cytology / Q000378:metabolism; D014161:Transduction, Genetic; D014611:Vaccination / Q000379:methods*
chemical_list: D019496:Cancer Vaccines; D016207:Cytokines; D049452:Green Fluorescent Proteins; D018719:Erb-b2 Receptor Tyrosine Kinases; D011993:Recombinant Fusion Proteins; C524056:Erbb2 protein, mouse