title: Antitumor activity of a fusion of esophageal carcinoma cells with dendritic cells derived from cord blood.
abstract: The aim of this experiment was to develop a cytotoxic cancer vaccine (EC109-DC) prepared by fusions of esophageal carcinoma cells with dendritic cells derived from cord blood and to study the biological characteristics and resultant induction of antitumor immunity. CD34+ hematopoietic stem cells were isolated from cord blood using a CD34+ Progenitor Cell Isolation Kit by magnetic cell sorting system (MACS). CD34+ cells were incubated with rhGM-CSF, rhTNF-alpha and rhSCF for 2 weeks as DC (dendritic cells), and then by PEG-3600 to fuse with an esophageal carcinoma cell line. Selection with MACS marked with HLA-DR MicroBeads generated EC109-DC. Phenotypes and proliferation were analyzed by flow cytometry and cell culture in vitro. The lymphocyte proliferation reaction and CTL cytotoxicity were examined by MTT assay. The EC109-DC cells could proliferate slowly in vitro and highly expressed CD80, CD83 and CD86. The lymphocyte proliferation reaction and specific cytotoxicity against EC109 induced by EC109-DC cells were significantly higher than in control groups (p < 0.05). EC109-DC cells obtained by PEG fusion acquired the immuno-stimulating phenotype and could significantly stimulate the lymphocyte proliferation reaction and CTL activity. The results of this research provide the basis for materials to develop the DC-based vaccine against esophageal carcinoma.
authors.affiliation: Department of Gastroenterology, The First Affiliated Hospital of Shantou University Medical College, Shantou 515041, Guangdong Province, China. stydfy@pub.shantou.gd.cn
authors.forename: Guanghua
authors.initials: G
authors.lastname: Guo
authors.forename: Suzuan
authors.initials: S
authors.lastname: Chen
authors.forename: Juan
authors.initials: J
authors.lastname: Zhang
authors.forename: Lili
authors.initials: L
authors.lastname: Luo
authors.forename: Jing
authors.initials: J
authors.lastname: Yu
authors.forename: Hongmei
authors.initials: H
authors.lastname: Dong
authors.forename: Hong
authors.initials: H
authors.lastname: Xu
authors.forename: Zhongjing
authors.initials: Z
authors.lastname: Su
authors.forename: Libiao
authors.initials: L
authors.lastname: Wu
mesh_terms: D000818:Animals; D018952:Antigens, CD34 / Q000276:immunology; D019496:Cancer Vaccines / Q000276:immunology*; D002459:Cell Fusion; D049109:Cell Proliferation; D003713:Dendritic Cells / Q000276:immunology*; D004938:Esophageal Neoplasms / Q000276:immunology*; D005312:Fetal Blood / Q000166:cytology / Q000276:immunology*; D005434:Flow Cytometry; D006412:Hematopoietic Stem Cells / Q000276:immunology; D006801:Humans; D007150:Immunohistochemistry; D007959:Lymphocyte Culture Test, Mixed; D051379:Mice; D013601:T-Lymphocytes / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology
chemical_list: D018952:Antigens, CD34; D019496:Cancer Vaccines