Dual Phase Regulation of Experimental Allergic Encephalomyelitis by Platelet-activating Factor

Overview

Journal J Exp Med

Specialties Allergy & Immunology
General Medicine

Date 2005 Sep 21

PMID 16172262

Citations 26

Authors

Yasuyuki Kihara

Satoshi Ishii

Yoshihiro Kita

Akiko Toda

Atsuyoshi Shimada

Takao Shimizu

Affiliations

Soon will be listed here.

Abstract

Experimental allergic encephalomyelitis (EAE) serves as a model for multiple sclerosis and is considered to be a CD4+ Th1 cell-mediated autoimmune disease. To investigate the role of platelet-activating factor (PAF) in this disease, PAF receptor (PAFR) KO (PAFR-KO) and wild-type (WT) mice, on a C57BL/6 genetic background, were immunized with myelin oligodendrocyte glycoprotein 35-55. The levels of PAF production and PAFR mRNA expression in the spinal cord (SC) correlated with the EAE symptoms. PAFR-KO mice showed lower incidence and less severe symptoms in the chronic phase of EAE than WT mice. However, no difference was observed in T cell proliferation, Th1-cytokine production, or titer of IgG2a between both genotypes. Before onset, as revealed by microarray analysis, mRNAs of inflammatory mediators and their receptors-including IL-6 and CC chemokine receptor 2-were down-regulated in the SC of PAFR-KO mice compared with WT mice. Moreover, in the chronic phase, the severity of inflammation and demyelination in the SC was substantially reduced in PAFR-KO mice. PAFR-KO macrophages reduced phagocytic activity and subsequent production of TNF-alpha. These results suggest that PAF plays a dual role in EAE pathology in the induction and chronic phases through the T cell-independent pathways.

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