title: Regional dichotomy of interleukin-4 and -5 regulation of senescent B cell responses specific for cholera toxin in Peyer's patches, lamina propria, and mesenteric lymph nodes.
abstract: The capacity of exogenous interleukin-4 (IL-4) and IL-5 to augment the antigen-specific senescent Peyer's patch (PP), lamina propria (LP), and mesenteric lymph nodes (MLN) B cells was investigated in the present studies. CTx-primed lymphocytes in the PP, LP, and MLN were obtained from 4-and 24-month old C57BL/6J male mice, 14 days after oral immunization with cholera toxin (CTx). Cells were cultured optimally for 4 days either alone, with lipopolysaccharide (LPS), with LPS plus recombinant IL-4 or IL-5, or with LPS plus IL-4 or IL-5 plus monoclonal antibodies specific for the respective interleukin. Culture supernantants were tested for IgA and IgG anti-CTx antibodies by an ELISA assay. The data indicated impaired antibody responses of aged PP and MLN B cells by the lack of LPS plus IL-4 induced enhancement of anti-CTx IgG antibody production as compared with the young group. For anti-CTx IgA production, aged LP and MLN B cells did not respond equally as well to LPS plus IL-5 stimulation as the young group. In contrast, aged PP B cells responded equally as well by anti-CTx IgA production to LPS plus IL-5 stimulation as the young group. Both anti-IL-4 and anti-IL-5 Mabs blocked the respective IL-4 and IL-5-induced enhancement of antigen-specific IgG or IgA antibody production. The findings suggest a regional dichotomy of IL-5 induced enhancement of aged IgA-producing B cells specific for CTx in the Peyer's patches, mesenteric lymph nodes, and lamina propria.
authors.affiliation: Department of Microbiology & Immunology, Queen's University, Kingston, Ontario, Canada.
authors.forename: J A
authors.initials: JA
authors.lastname: Haq
authors.forename: M R
authors.initials: MR
authors.lastname: Szewczuk
mesh_terms: D000375:Aging / Q000276:immunology; D000818:Animals; D002772:Cholera Toxin / Q000276:immunology; D007070:Immunoglobulin A / Q000096:biosynthesis; D007074:Immunoglobulin G / Q000096:biosynthesis; D015847:Interleukin-4 / Q000494:pharmacology*; D015848:Interleukin-5 / Q000494:pharmacology*; D007413:Intestinal Mucosa / Q000166:cytology / Q000276:immunology; D008198:Lymph Nodes / Q000166:cytology / Q000276:immunology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D010581:Peyer's Patches / Q000166:cytology / Q000276:immunology
chemical_list: D007070:Immunoglobulin A; D007074:Immunoglobulin G; D015848:Interleukin-5; D015847:Interleukin-4; D002772:Cholera Toxin