title: Adenovirus-mediated CD40 ligand gene-engineered dendritic cells elicit enhanced CD8(+) cytotoxic T-cell activation and antitumor immunity.
abstract: CD40L, the ligand for CD40 on dendritic cells (DCs), plays an important role in their activation and is essential for induction of antigen-specific T-cell responses. In the present study, we investigated the efficacy of antitumor immunity induced by vaccination with DCs engineered to express CD40L and pulsed with Mut1 tumor peptide. Our data show that transfection of DCs with recombinant adenovirus AdV-CD40L resulted in activation of DCs with up-regulated expression of proinflammatory cytokines (IL-1beta and IL-12), chemokines (RANTES, IP-10, and MIP-1alpha), and immunologically important cell surface molecules (CD54, CD80, and CD86). Our data also demonstrate that DCs transfected with AdV-CD40L (DC(CD40L)) are able to stimulate enhanced allogeneic T-cell proliferation and Mut1-specific CD8(+) cytotoxic T-cell responses in vitro. Vaccination of mice with Mut1 peptide-pulsed control virus-transfected DC (DC(pLpA)) could only protect mice from challenge of a low dose (0.5 x 10(5) cells per mouse, 8/8 mice), but not a high dose (3 x 10(5) cells per mouse, 0/8 mice) of 3LL tumor cells. However, vaccination of Mut1 peptide-pulsed AdV-CD40L-transfected DC(CD40L) induced an augmented antitumor immunity in vivo by complete protection of mice (8/8) from challenge of both low and high doses of 3LL tumor cells. Thus, DCs engineered to express CD40L by adenovirus-mediated CD40 ligand gene transfer may offer a new strategy in production of DC cancer vaccines.
authors.affiliation: Research Unit, Saskatchewan Cancer Agency and Department of Oncology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0W0, Canada.
authors.forename: Yongqing
authors.initials: Y
authors.lastname: Liu
authors.forename: Xuishu
authors.initials: X
authors.lastname: Zhang
authors.forename: Weidong
authors.initials: W
authors.lastname: Zhang
authors.forename: Zhuang
authors.initials: Z
authors.lastname: Chen
authors.forename: Tim
authors.initials: T
authors.lastname: Chan
authors.forename: Kaiser
authors.initials: K
authors.lastname: Ali
authors.forename: Zongchao
authors.initials: Z
authors.lastname: Jia
authors.forename: Jim
authors.initials: J
authors.lastname: Xiang
mesh_terms: D000256:Adenoviridae / Q000235:genetics*; D000818:Animals; D000951:Antigens, Neoplasm / Q000235:genetics; D023201:CD40 Ligand / Q000235:genetics / Q000378:metabolism*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D002478:Cells, Cultured; D018925:Chemokines / Q000378:metabolism; D003713:Dendritic Cells / Q000276:immunology*; D018014:Gene Transfer Techniques; D015316:Genetic Therapy / Q000379:methods*; D005822:Genetic Vectors; D007111:Immunity, Cellular; D016130:Immunophenotyping; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D009842:Oligopeptides / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D014162:Transfection
chemical_list: D000951:Antigens, Neoplasm; D018925:Chemokines; C096894:MUT 1 peptide; D009842:Oligopeptides; D023201:CD40 Ligand