title: Potent systemic antitumor immunity induced by vaccination with chemotactic-prostate tumor associated antigen gene-modified tumor cell and blockade of B7-H1.
abstract: We previously reported that several DNA fragments from human prostate-specific membrane antigen (hPSM), mouse prostatic acid phosphatase (mPAP), and human prostate-specific antigen (hPSA) genes were selected and fused to create a novel hPSM-mPAP-hPSA fusion gene (named 3P gene), and human secondary lymphoid tissue chemokine (SLC), 3P, and human IgG Fc genes were inserted into pcDNA3.1 to construct a DNA vaccine, designated pSLC-3P-Fc. In this report, to establish a more efficient treatment for immunotherapy against prostate cancer, the construct was transfected into B16F10 to generate gene-modified tumor cell vaccine (named B16F10-SLC-3P-Fc). In poorly immunogenic B16F10 mouse melanoma model, the immunization with B16F10-SLC-3P-Fc resulted in a strong antitumor response and 50% of tumor-bearing mice achieved long-term survival (>120 days). In vivo depletion of lymphocytes indicated that CD8(+) T cells were involved in the direct tumor killing, whereas CD4(+) T lymphocytes were required for the induction of CD8(+) CTL response in B16F10-SLC-3P-Fc-immunized mice. Splenocytes from B16F10-SLC-3P-Fc-immunized mice specifically recognized and lysed PSM, PAP, PSA, and 3P expressing tumor cells. The combined therapy of B16F10-SLC-3P-Fc plus anti-B7-H1 MAbs further enhanced the immune response. Rechallenge experiment showed that a persistent memory response was successfully induced by the combined therapy. These observations suggest pSLC-3P-Fc-modified tumor cells could serve as a vaccine against prostate cancer, and the therapy combined with anti-B7-H1 MAbs further enhanced the antitumor immune response.
authors.affiliation: Department of Immunology, Cancer Institute, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, 100021, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Li
authors.forename: Hanjun
authors.initials: H
authors.lastname: Qin
authors.forename: Xiaozhu
authors.initials: X
authors.lastname: Li
authors.forename: Chunxia
authors.initials: C
authors.lastname: Zhou
authors.forename: Dongmei
authors.initials: D
authors.lastname: Wang
authors.forename: Wenbo
authors.initials: W
authors.lastname: Ma
authors.forename: Chen
authors.initials: C
authors.lastname: Lin
authors.forename: Youhui
authors.initials: Y
authors.lastname: Zhang
authors.forename: Shengdian
authors.initials: S
authors.lastname: Wang
authors.forename: Shuren
authors.initials: S
authors.lastname: Zhang
mesh_terms: D000135:Acid Phosphatase; D000818:Animals; D017951:Antigen Presentation / Q000276:immunology; D015703:Antigens, CD / Q000276:immunology*; D000951:Antigens, Neoplasm / Q000276:immunology*; D000954:Antigens, Surface / Q000276:immunology; D060890:B7-H1 Antigen; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology; D019496:Cancer Vaccines / Q000008:administration & dosage / Q000276:immunology*; D018925:Chemokines / Q000276:immunology*; D002634:Chemotaxis, Leukocyte / Q000276:immunology; D003602:Cytotoxicity, Immunologic; D003713:Dendritic Cells / Q000276:immunology; D006801:Humans; D007167:Immunotherapy / Q000379:methods; D007279:Injections, Subcutaneous; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D017430:Prostate-Specific Antigen / Q000276:immunology*; D011471:Prostatic Neoplasms / Q000276:immunology* / Q000473:pathology / Q000628:therapy; D017027:Protein Tyrosine Phosphatases / Q000276:immunology; D015996:Survival Rate; D014407:Tumor Cells, Cultured; D019444:Vaccines, DNA / Q000008:administration & dosage / Q000276:immunology*
chemical_list: D015703:Antigens, CD; D000951:Antigens, Neoplasm; D000954:Antigens, Surface; D060890:B7-H1 Antigen; C423236:CD274 protein, human; D019496:Cancer Vaccines; D018925:Chemokines; D019444:Vaccines, DNA; D000135:Acid Phosphatase; C428439:prostatic acid phosphatase; D017027:Protein Tyrosine Phosphatases; D017430:Prostate-Specific Antigen