title: In vivo anti-tumor effect of hybrid vaccine of dendritic cells and esophageal carcinoma cells on esophageal carcinoma cell line 109 in mice with severe combined immune deficiency.
abstract: OBJECTIVE
  To develop a fusion vaccine of esophageal carcinoma cells and dendritic cells (DC) and observe its protective and therapeutic effect against esophageal carcinoma cell line 109 (EC109).
  
  
  METHODS
  The fusion vaccine was produced by fusing traditional polyethyleneglycol (PEG), inducing cytokine, sorting CD34+ magnetic microbead marker and magnetic cell system (MACS). The liver, spleen and lung were pathologically tested after injection of the fusion vaccine. To study the therapeutic and protective effect of the fusion vaccine against tumor EC109, mice were divided immune group and therapeutic group. The immune group was divided into P, E, D and ED subgroups, immunized by phosphate buffered solution (PBS), inactivated EC109, DC and the fusion vaccine respectively, and attacked by EC109 cells. The tumor size, weight, latent period and mouse survival period were recorded and statistically analyzed. The therapeutic group was divided into four subgroups: P, inactivated EC109, D and ED subgroups, which were attacked by EC109 and then treated with PBS, inactivated EC109, DC, and EC109-DC respectively. Pathology and flow cytometry were also used to study the therapeutic effect of the fusion vaccine against EC109 cells.
  
  
  RESULTS
  Flow cytometry showed that the expression of folate receptor (FR), EC109 (C), DCs (D) in human nasopharyngeal carcinoma cell line (HNE1) (B) was 78.21%, 89.50%, and 0.18%, respectively. The fusion cells (C) were highly expressed. No tumor was found in the spleen, lung and liver after injection of the fusion vaccine. Human IgG was tested in peripheral blood lymphocytes (PBL). In the immune group, the latent period was longer in EC109-DC subgroup than in other subgroups, while the tumor size and weight were also smaller than those in ED subgroup. In the therapeutic group, the tumor size and weight were smaller in ED subgroup than in P, inactivated EC109 and DC subgroups.
  
  
  CONCLUSIONS
  Fusion cells are highly expressed not only in FR but also in CD80. The fusion vaccine has a distinctive protective effect against tumor EC109 and can inhibit the growth of tumor in mice, and its immune protection against tumor attack is more significant.
authors.affiliation: Department of Gastroenterology, The First Affiliated Hospital of Shantou University Medical College, Shantou 515041, Guangdong Province, China. ghguo@stu.edu.cn
authors.forename: Guang-Hua
authors.initials: GH
authors.lastname: Guo
authors.forename: Su-Zuan
authors.initials: SZ
authors.lastname: Chen
authors.forename: Jing
authors.initials: J
authors.lastname: Yu
authors.forename: Juan
authors.initials: J
authors.lastname: Zhang
authors.forename: Li-Li
authors.initials: LL
authors.lastname: Luo
authors.forename: Li-Hua
authors.initials: LH
authors.lastname: Xie
authors.forename: Zhong-Jing
authors.initials: ZJ
authors.lastname: Su
authors.forename: Hong-Mei
authors.initials: HM
authors.lastname: Dong
authors.forename: Hong
authors.initials: H
authors.lastname: Xu
authors.forename: Li-Biao
authors.initials: LB
authors.lastname: Wu
mesh_terms: D000818:Animals; D018952:Antigens, CD34 / Q000096:biosynthesis; D000951:Antigens, Neoplasm / Q000737:chemistry; D019496:Cancer Vaccines / Q000737:chemistry*; D002277:Carcinoma / Q000628:therapy*; D045744:Cell Line, Tumor; D003713:Dendritic Cells / Q000166:cytology*; D004938:Esophageal Neoplasms / Q000628:therapy*; D006801:Humans; D007074:Immunoglobulin G / Q000737:chemistry; D007167:Immunotherapy / Q000379:methods*; D051379:Mice; D016513:Mice, SCID; D008954:Models, Biological; D009368:Neoplasm Transplantation / Q000379:methods*
chemical_list: D018952:Antigens, CD34; D000951:Antigens, Neoplasm; D019496:Cancer Vaccines; D007074:Immunoglobulin G