title: Identification of Toxoplasma gondii protein fractions induce immune response against melanoma in mice.
abstract: Dendritic cells (DCs) play a crucial role in the initiation of adaptive immune responses against tumor cells. We recently found that protein components of Toxoplasma gondii (T. gondii) could mature DCs efficiently. Therefore, in this study, we aimed to find the most effective protein components of T. gondii which are able to mature DCs and consequently instruct immune responses in tumor-bearing mice. Soluble tachyzoite antigens (STAgs) were fractionated by ammonium sulfate precipitation and subsequently by anion-exchange HPLC. Immature DCs (iDCs) were treated by these protein fractions and were monitored for IL-12p70 and IL-10 production. Moreover, the capacity of mature DCs (mDCs) to induce lymphocyte proliferation was investigated. Ultimately, we analyzed the ability of mDCs in instructing immune responses in tumor-bearing mice. We found that ammonium sulfate fraction one (A1) matured-DCs produced higher IL-12 level and IL-12/IL-10 ratio; therefore, this fraction was selected for further fractionation by anion-exchange HPLC. The results showed that anion-exchange HPLC fraction 14 (C14) matured-DCs secrete higher levels of IL-12p70 and IL-12p70/IL-10 ratio. Survival of the mice matured by A1 fraction increased significantly compared to other groups. Moreover, SDS-PAGE electrophoresis showed that different obtained fractions have distinct proteins based on their size. These results demonstrate that two protein fractions of T. gondii are able to mature DCs more efficient.
authors.affiliation: Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Roobina
authors.initials: R
authors.lastname: Boghozian
authors.affiliation: Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Azad
authors.initials: A
authors.lastname: Saei
authors.affiliation: Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Reza
authors.initials: R
authors.lastname: Mirzaei
authors.affiliation: Department of Laboratory Sciences, School of Paramedicine, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Arezoo
authors.initials: A
authors.lastname: Jamali
authors.affiliation: Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran.
authors.forename: Behrooz
authors.initials: B
authors.lastname: Vaziri
authors.affiliation: Department of Immunology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Alireza
authors.initials: A
authors.lastname: Razavi
authors.affiliation: Department of Immunology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Jamshid
authors.initials: J
authors.lastname: Hadjati
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000502:physiology; D003713:Dendritic Cells / Q000276:immunology; D005260:Female; D016753:Interleukin-10 / Q000276:immunology; D018664:Interleukin-12 / Q000276:immunology; D008213:Lymphocyte Activation / Q000276:immunology; D008545:Melanoma / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D015800:Protozoan Proteins / Q000276:immunology*; D014122:Toxoplasma / Q000276:immunology*
chemical_list: D015800:Protozoan Proteins; D016753:Interleukin-10; D018664:Interleukin-12
keywords: Dendritic cells; Toxoplasma gondii; immune response; tumor