title: Vasoactive intestinal peptide specifically induces human IgA1 and IgA2 production.
abstract: The effects of vasoactive intestinal peptide (VIP) on human IgA1 and IgA2 production were studied. In unfractionated small resting B cells stimulated with anti-CD40 monoclonal antibody (mAb), VIP induced IgA1 and IgA2 production without affecting the production of IgG1, IgG2, IgG3, IgG4, IgM, or IgE. When small B cells were separated into sIgA1+, sIgA2+, sIgA1- and sIgA2- B cells, anti-CD40 mAb plus VIP induced IgA1 and IgA2 production by surface IgA1- (sIgA1-) and sIgA2- B cells, respectively, while having no effect on sIgA1+ and sIgA2+ B cells. This induction by VIP was specific, since anti-CD40 mAb plus other neuropeptides, i.e., somatostatin or substance P, had no effect, and moreover, the induction was specifically blocked by a VIP antagonist. Further, anti-CD40 mAb plus various cytokines, including interleukin (IL)-1 beta, IL-2, IL-3, IL-4, IL-5, IL-6, IL-10, transforming growth factor-beta, low molecular weight B cell growth factor, and interferon-gamma, did not induce IgA1 and IgA2 production by sIgA1- and sIgA2- B cells, respectively. These results indicate that in the presence of anti-CD40 mAb, VIP induces IgA1 and IgA2 production by isotype switching.
authors.affiliation: Department of Pediatrics, Faculty of Medicine, Kyoto University Hospital, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kimata
authors.forename: M
authors.initials: M
authors.lastname: Fujimoto
mesh_terms: D000911:Antibodies, Monoclonal; D015703:Antigens, CD / Q000276:immunology*; D000944:Antigens, Differentiation, B-Lymphocyte / Q000276:immunology*; D016175:B-Lymphocyte Subsets / Q000276:immunology*; D019013:CD40 Antigens; D002478:Cells, Cultured; D016207:Cytokines / Q000502:physiology; D006801:Humans; D007070:Immunoglobulin A / Q000096:biosynthesis* / Q000145:classification; D014660:Vasoactive Intestinal Peptide / Q000502:physiology*
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D000944:Antigens, Differentiation, B-Lymphocyte; D019013:CD40 Antigens; D016207:Cytokines; D007070:Immunoglobulin A; D014660:Vasoactive Intestinal Peptide