Dendritic Cell-derived Nitric Oxide is Involved in IL-4-induced Suppression of Experimental Allergic Encephalomyelitis (EAE) in Lewis Rats

Overview

Journal Clin Exp Immunol

Publisher Oxford University Press

Specialty Allergy & Immunology

Date 1999 Oct 30

PMID 10540168

Citations 8

Authors

L Xu

Y Huang

J Yang

P H van der Meide

M Levi

B Wahren

H Link

B Xiao

Affiliations

Soon will be listed here.

Abstract

Cytokines play a crucial role in initiating and perpetuating EAE, an animal model of multiple sclerosis (MS). A low dose of IL-4, administered by the nasal route over 5 days (100 ng/rat per day) prior to immunization, improved clinical scores of EAE induced in Lewis rats with myelin basic protein (MBP) peptide 68-86 (MBP 68-86). We examined whether dendritic cells (DC) may have contributed to the amelioration of the disease process. These professional antigen-presenting cells (APC) not only activate T cells, but also tolerize T cells to antigens, thereby minimizing autoimmune reactions. We found that IL-4 administration enhanced proliferation of DC. In comparison with DC of PBS-treated rats, DC from IL-4-treated rats secreted high levels of interferon-gamma (IFN-gamma) and IL-10. Nitric oxide (NO) production by DC was also strongly augmented in IL-4-treated rats. In vitro studies showed that IL-4 stimulated DC expansion and that IFN-gamma enhanced NO production by DC. DC-derived NO promoted apoptosis of autoreactive T cells. These results indicate that nasal administration of IL-4 promotes activation of DC and induces production of IFN-gamma and IL-10 by DC. IL-10 suppresses antigen presentation by DC, while IFN-gamma induces NO production by DC which leads to apoptosis in autoreactive T cells. Such a DC-derived negative feedback loop might contribute to the clinical improvement observed in EAE.

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