title: Antigen-specific lymphocyte proliferation as a marker of immune response in guinea pigs with sustained Helicobacter pylori infection.
abstract: Helicobacter pylori (H. pylori) bacteria are human pathogens causing symptomatic gastritis, peptic ulcer or gastric cancer. Little is known about the kinetics of immune responses in H. pylori infected patients because the initial moment of infection has not been identified. Various animal models are used to investigate the immune processes related to H. pylori infection. In this study we checked whether H. pylori infection in guinea pigs, mimicking natural H. pylori infection in humans, resulted in the development of specific immune responses to H. pylori antigens by measuring the proliferation of lymphocytes localized in mesenteric lymph nodes, spleen and peripheral blood. The maturity of macrophages and cytokines, delivered by monocyte-macrophage lineage or lymphocytes, were considered as mediators, which might influence the lymphocyte blastogenic response. The obtained results showed the activation of T cells localized in mesenteric lymph nodes by H. pylori antigens in H. pylori infected guinea pigs four weeks postinfection. The blastogenic activity of lymphocytes was shaped by their interaction with antigen presenting cells, which were present in the cell cultures during the whole culture period. Moreover, the balance between cytokines derived from adherent leukocytes including interleukin 8--IL-8 as well as interferon gamma--IFN-γ, and transforming growth factor beta--TGF-β delivered by lymphocytes, was probably important for the successful proliferation of lymphocytes. The H. pylori specific lymphocytes were not propagated in peripheral blood and spleen of H. pylori infected animals. The modulation of immunocompetent cells by H. pylori antigens or their different distribution cannot be excluded.
authors.affiliation: Department of Immunology and Infectious Biology, Institute of Microbiology, Biotechnology and Immunology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland.
authors.forename: Eliza
authors.initials: E
authors.lastname: Miszczyk
authors.affiliation: Department of Immunology and Infectious Biology, Institute of Microbiology, Biotechnology and Immunology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland.
authors.forename: Maria
authors.initials: M
authors.lastname: Walencka
authors.affiliation: Department of Immunology and Infectious Biology, Institute of Microbiology, Biotechnology and Immunology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland.
authors.forename: Karolina
authors.initials: K
authors.lastname: Rudnicka
authors.affiliation: Department of Immunology and Infectious Biology, Institute of Microbiology, Biotechnology and Immunology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland.
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Matusiak
authors.affiliation: Department of Immunology and Infectious Biology, Institute of Microbiology, Biotechnology and Immunology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland.
authors.forename: Wiesława
authors.initials: W
authors.lastname: Rudnicka
authors.affiliation: Department of Immunology and Infectious Biology, Institute of Microbiology, Biotechnology and Immunology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Chmiela
mesh_terms: D000818:Animals; D000942:Antigens, Bacterial / Q000097:blood / Q000494:pharmacology*; D049109:Cell Proliferation / Q000187:drug effects*; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000187:drug effects / Q000276:immunology / Q000382:microbiology; D006168:Guinea Pigs; D016481:Helicobacter Infections / Q000097:blood / Q000276:immunology* / Q000382:microbiology / Q000473:pathology; D016480:Helicobacter pylori / Q000276:immunology*; D007111:Immunity, Cellular; D007371:Interferon-gamma / Q000096:biosynthesis; D016209:Interleukin-8 / Q000096:biosynthesis; D008198:Lymph Nodes / Q000276:immunology / Q000382:microbiology / Q000473:pathology; D008213:Lymphocyte Activation; D018655:Lymphocyte Count; D008214:Lymphocytes / Q000187:drug effects / Q000276:immunology* / Q000382:microbiology; D008264:Macrophages / Q000187:drug effects / Q000276:immunology / Q000382:microbiology; D008297:Male; D008643:Mesentery / Q000276:immunology / Q000382:microbiology / Q000473:pathology; D013154:Spleen / Q000276:immunology / Q000382:microbiology / Q000473:pathology; D016212:Transforming Growth Factor beta / Q000096:biosynthesis
chemical_list: D000942:Antigens, Bacterial; D016209:Interleukin-8; D016212:Transforming Growth Factor beta; D007371:Interferon-gamma