title: Multiple administrations of oligodeoxynucleotides containing CpG motifs influence Ig isotype production.
abstract: Oligodeoxynucleotides containing CpG motifs (CpG-ODN) activate cells of the innate immune system. Recent studies have shown that sole CpG-ODN administration induces resistance against infection and tumors. Effects of CpG-ODN administration are rapidly induced, and regarding infections only short-term protection was seen. One conceivable strategy to prolong protective effects is multiple administrations of CpG-ODN. However, inappropriate immune activation via CpG motifs has been implicated in septic shock and autoimmunity. To investigate effects of multiple CpG-ODN administrations, we analyzed Th1- and Th-2-associated Ig antibody levels, during and after multiple treatment with CpG-ODN. Our results show that multiple administrations of CpG-ODN lead to an increase in total IgG2c levels in CpG-ODN-treated mice in comparison to controls with distinct time and frequency correlation, in the absence of additional stimuli. This indicates a humoral Th1 bias based on stimulation of Th1-Ig isotype-producing B cells. These effects could account for observed anti-infection and anti-tumor properties of multiple CpG-ODN administrations; on the other hand, they might cause autoimmune disease.
authors.affiliation: Center for Neuropathology and Prion Research, Ludwig-Maximilians Universität München, München, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Sethi
authors.forename: S
authors.initials: S
authors.lastname: Ebner
authors.forename: C
authors.initials: C
authors.lastname: Hinske
authors.forename: H
authors.initials: H
authors.lastname: Kretzschmar
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D005260:Female; D007074:Immunoglobulin G / Q000097:blood*; D051379:Mice; D009838:Oligodeoxyribonucleotides / Q000008:administration & dosage*; D018417:Th1 Cells / Q000276:immunology*; D018418:Th2 Cells / Q000276:immunology*
chemical_list: C408982:CPG-oligonucleotide; D007074:Immunoglobulin G; D009838:Oligodeoxyribonucleotides