Local Therapy with CpG Motifs in a Murine Model of Allergic Airway Inflammation in IFN-beta Knock-out Mice

Overview

Journal Respir Res

Specialty Pulmonary Medicine

Date 2005 Mar 8

PMID 15748290

Citations 4

Authors

Victor Matheu

Alexandra Treschow

Ingrid Teige

Vaidrius Navikas

Shohreh Issazadeh-Navikas

Affiliations

Soon will be listed here.

Abstract

Background: CpG oligodeoxynucleotides (CpG-ODN) are capable of inducing high amounts of type I IFNs with many immunomodulatory properties. Furthermore, type-I IFNs have been proposed to play a key role in mediating effects of CpG-ODN. The precise role of IFN-beta in the immunomodulatory effects of CpG-ODN is not known.

Objective: Here, we aimed to elucidate the role of IFN-beta in the anti-allergic effect of CpG motifs.

Methods: We assessed the immune response in OVA-primed/OVA-challenged IFN-beta knockout (-/-) mice compared to wild type (WT) control, after intranasal and systemic treatment with synthetic CpG motifs.

Results: Vaccination with CpG-ODN reduced the number of cells in airways of OVA-sensitized WT but not IFN-beta-/- mice. Although airway eosinophilia was reduced in both treated groups, they were significantly higher in IFN-beta-/- mice. Other inflammatory cells, such as lymphocytes and macrophages were enhanced in airways by CpG treatment in IFN-beta-/- mice. The ratio of IFN-gamma/IL-4 cytokines in airways was significantly skewed to a Th1 response in WT compared to IFN-beta-/- group. In contrast, IL-4 and IgE were reduced with no differences between groups. Ag-specific T-cell proliferation, Th1-cytokines such as IFN-gamma, IL-2 and also IL-12 were significantly lower in IFN-beta-/- mice. Surprisingly, we discovered that intranasal treatment of mice with CpG-ODN results in mild synovitis particularly in IFN-beta-/- mice.

Conclusion: Our results indicate that induction of Th1 response by therapy with CpG-ODN is only slightly and partially dependent on IFN-beta, while IFN-beta is not an absolute requirement for suppression of airway eosinophilia and IgE. Furthermore, our finding of mild synovitis is a warning for possible negative effects of CpG-ODN vaccination.

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