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From the Departments of Pathology,*
Molecular
Microbiology and Immunology,
and Environmental
Health Sciences,
the Johns Hopkins Medical
Institutions, Baltimore, Maryland
Myocarditis in humans is often associated with an autoimmune
process in which cardiac myosin (CM) is a major autoantigen.
Experimental autoimmune myocarditis (EAM) is induced in mice by
immunization with CM. We found that EAM in A/J mice exhibits a Th2-like
phenotype demonstrated by the histological picture of the heart lesions
(eosinophils and giant cells) and by the humoral response (association
of IgG1 response with disease and up-regulation of total IgE). Blocking
interleukin (IL)-4 with anti-IL-4 monoclonal antibody (mAb) reduced the
severity of EAM. This reduction in severity was associated with a shift
from a Th2-like to a Th1-like phenotype represented by a reduction in
CM-specific IgG1; an increase in CM-specific IgG2a; an abrogation of
total IgE response; a decrease in IL-4, IL-5, and
IL-13; as well as a dramatic increase in interferon (IFN)-
production in vitro. Based on the latter
finding, we hypothesized that IFN-
limits disease.
Indeed, IFN-
blockade with a mAb exacerbated disease. The
ameliorating effect of IL-4 blockade was abrogated by co-administration
of anti-IFN-
mAb. Thus, EAM represents a model of an
organ-specific autoimmune disease associated with a Th2
phenotype, in which IL-4 promotes the disease and IFN-
limits it. Suppression of IFN-
represents at least one of the
mechanisms by which IL-4 promotes EAM.
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