title: Delivery of antigen in allogeneic cells preferentially generates CD(4+) Th1 cells.
abstract: We have examined the possibility of evoking antigen-specific T cell immune response by using allogeneic cells as a source of adjuvant and also as a vehicle to deliver antigen. The mice were immunized with different preparations of antigen-pulsed allogeneic and syngeneic splenocytes. It was observed during the study that the animals immunized with antigen-pulsed mitomycin C treated allogeneic cells elicited antigen specific CD(4+) Th1 cell response. Predominant release of IL-2, interferon (IFN)-gamma and IgG2a-isotype also occurred. In contrast, mice immunized with antigen-pulsed syngeneic cells chiefly enhanced the production of interleukin (IL)-4 and IgG1-isotype. Further, allogeneic macrophages induced better T cell response than B cells or splenocytes and prominently induced the expression of B7-1 and B7-2. Immunization with antigen-pulsed macrophages provided better recall responses compared to B cells. This was manifested by the high LFA-1alpha and low CD45RB expression on T cells. Because it is already known that mitomycin C-treated cells undergo apoptosis and dendritic cells engulf apoptotic cells, we therefore propose that generation of T cell response using antigen-pulsed allogeneic cells may be due to the engulfment of these cells by dendritic cells, which may then process and present antigen entrapped in allogeneic cells to activate naive CD(4+) T cells and differentiate them to Th1 cells. This study therefore provides a rational basis for manipulating antigen-specific responses by immunizing with antigen-pulsed allogeneic cells.
authors.affiliation: Institute of Microbial Technology, Chandigarh, India. javed@imtech.res.in
authors.forename: J N
authors.initials: JN
authors.lastname: Agrewala
authors.forename: S
authors.initials: S
authors.lastname: Suvas
authors.forename: V
authors.initials: V
authors.lastname: Singh
authors.forename: H
authors.initials: H
authors.lastname: Vohra
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology; D005260:Female; D007074:Immunoglobulin G / Q000276:immunology; D007156:Immunologic Memory; D016219:Immunotherapy, Adoptive / Q000379:methods*; D007371:Interferon-gamma / Q000276:immunology; D015847:Interleukin-4 / Q000276:immunology; D007519:Isoantigens / Q000008:administration & dosage*; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000276:immunology; D008264:Macrophages / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D018417:Th1 Cells / Q000276:immunology*; D018418:Th2 Cells / Q000276:immunology; D014184:Transplantation, Homologous
chemical_list: D007074:Immunoglobulin G; D007519:Isoantigens; D015847:Interleukin-4; D007371:Interferon-gamma