Volume 44, Issue 4 pp. 381-396
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Heat shock proteins and experimental autoimmune encephalomyelitis (EAE): I. Immunization with a peptide of the myelin protein 2′,3′ cyclic nucleotide 3′ phosphodiesterase that is cross-reactive with a heat shock protein alters the course of EAE

G. Birnbaum

Corresponding Author

G. Birnbaum

Departments of Neurology, Microbiology, and Laboratory Medicine and Pathology, University of Minnesota, Minneapolis

Department of Neurology, University of Minnesota, Box 295, UMHC, Minneapolis, MN 55455Search for more papers by this author
L. Kotilinek

L. Kotilinek

Departments of Neurology, Microbiology, and Laboratory Medicine and Pathology, University of Minnesota, Minneapolis

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P. Schlievert

P. Schlievert

Departments of Neurology, Microbiology, and Laboratory Medicine and Pathology, University of Minnesota, Minneapolis

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H.B. Clark

H.B. Clark

Departments of Neurology, Microbiology, and Laboratory Medicine and Pathology, University of Minnesota, Minneapolis

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J. Trotter

J. Trotter

Department of Neurology, Washington University School of Medicine, St. Louis, Missouri

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E. Horvath

E. Horvath

Biochemistry Department, McGill University, Montreal, Canada

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E. Gao

E. Gao

Biochemistry Department, McGill University, Montreal, Canada

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M. Cox

M. Cox

Biochemistry Department, McGill University, Montreal, Canada

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P.E. Braun

P.E. Braun

Biochemistry Department, McGill University, Montreal, Canada

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Abstract

We describe sequence similarity and immunologic cross-reactivity between a peptide of the mycobacterial hsp, HSP65, and the myelin protein 2′,3′ cyclic nucleotide 3′ phosphodiesterase (CNP). We demonstrate that immunization with the homologous cross-reactive CNP peptide (hsp-CNP peptide) has significant biological consequences. Rats immunized with hsp-CNP peptide in either complete Freund's adjuvant (CFA) or incomplete Freund's adjuvant (IFA) produce large amounts of peptide-specific antibody. Isotypes of antibodies in animals immunized with peptide in CFA are IgG1 and IgG2a. Isotypes of antibodies in rats immunized with peptide in IFA are predominantly IgG1, with low titers of IgG2a. T cell proliferative responses to HSP65 are present in rats immunized with peptide in CFA. T cell responses to HSP65 initially are absent in rats immunized with peptide in IFA but develop over time. T cell proliferative responses to hsp-CNP peptide were not detected. None of the groups of rats developed clinical or histologic evidence of experimental autoimmune encephalomyelitis (EAE). To induce EAE, rats preimmunized with hsp-CNP peptide were challenged with guinea pig spinal cord (GPSC) emulsified in CFA. Rats preimmunized with peptide in CFA developed severe EAE. Rats preimmunized with hsp-CNP peptide in IFA were protected from EAE, with both a lower incidence and severity of disease. Injecting the murine monoclonal antibody recognizing the shared HSP65 and CNP epitope did not protect against EAE. Our data suggest that a Th2 pattern of immune response to a CNP peptide that itself is non-encephalitogenic protects against EAE. Immune responses to either hsp or myelin proteins cross-reactive with hsp may play an important role in the development of EAE. © 1996 Wiley-Liss, Inc.

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