title: Effects of crude antigenic fractions of Leishmania major on natural killer cell cytotoxicity, interferon-gamma and interleukin-4 secretion from peripheric blood lymphocytes of unexposed individuals.
abstract: The crude antigenic fraction (CAF) isolated from Leishmania major was fractionated into three subfractions by sodium dodecyl sulphate-polyacrylamide gel (SDS-PAGE). The effects of CAF and its subfractions on NK cell cytotoxicity is investigated by chromium release assay. These subfractions designated as fractions 1, 2 and 3 correspond to 97.4-66 kD, 66-45 kD and 29 kD and below respectively. Although both CAF and its subfractions have inhibited the cytotoxicity of natural killer (NK) cells, the effects of fractions 2 and 3 were more pronounced. The effect of the fractions on the Interferon-gamma (IFN-gamma) and Interleukin-4 (IL-4) secretion by peripheric blood lymphocytes was also analyzed. It was found that CAF and fraction 1 induce IFN-gamma secretion while on the other hand IL-4 secretion was mostly suppressed by fraction 2. Therefore, further research is being executed which focuses on the effects of CAF, fractions 1 and 2 on macrophage effector functions.
authors.affiliation: Gazi University, Faculty of Medicine, Department of Microbiology, Ankara, Turkey.
authors.forename: A
authors.initials: A
authors.lastname: Turhan
authors.forename: S
authors.initials: S
authors.lastname: Mirshahidi
authors.forename: A K
authors.initials: AK
authors.lastname: Pişkin
authors.forename: B
authors.initials: B
authors.lastname: Citak
authors.forename: T
authors.initials: T
authors.lastname: Imir
mesh_terms: D000818:Animals; D000953:Antigens, Protozoan / Q000276:immunology* / Q000494:pharmacology; D005591:Chemical Fractionation; D003601:Cytotoxicity Tests, Immunologic; D006801:Humans; D007371:Interferon-gamma / Q000378:metabolism*; D015847:Interleukin-4 / Q000378:metabolism*; D007694:Killer Cells, Natural / Q000187:drug effects / Q000276:immunology*; D018320:Leishmania major / Q000276:immunology*; D008214:Lymphocytes / Q000187:drug effects / Q000276:immunology*; D014407:Tumor Cells, Cultured
chemical_list: D000953:Antigens, Protozoan; D015847:Interleukin-4; D007371:Interferon-gamma