Journal Article

Immune profile of an atypical EAE model in marmoset monkeys immunized with recombinant human myelin oligodendrocyte glycoprotein in incomplete Freund’s adjuvant

Bauer, Jan, Heijmans, Nicole, Weissert, Robert, t Hart, Bert A., Blezer, Erwin L A, Jagessar, S. Anwar

2015

Overview

Background Experimental autoimmune encephalomyelitis (EAE) in the common marmoset monkey ( Callithrix jacchus ) is a relevant preclinical model for translational research into immunopathogenic mechanisms operating in multiple sclerosis (MS). Prior studies showed a core pathogenic role of T and B cells specific for myelin oligodendrocyte glycoprotein (MOG). However, in those studies, the quality of the response against MOG epitopes was strongly biased by bacterial antigens in the complete Freund’s adjuvant (CFA), in which the immunizing recombinant human (rh) MOG protein had been formulated. In response to the need of a more refined EAE model, we have tested whether disease could also be induced with rhMOG in incomplete Freund’s adjuvant (IFA). Method Marmosets were immunized with rhMOG emulsified in IFA in the dorsal skin. Monkeys that did not develop neurological deficit were given booster immunizations at 28-day interval with the same antigen preparation. In a second experiment, three marmoset twin pairs were sensitized against MOG peptides in IFA to study a possibility for suppressive activity towards pathogenic T cells directed against the encephalitogenic epitope MOG40-48. Results Despite the absence of strong danger signals in the rhMOG/IFA inoculum, all monkeys developed clinically evident EAE symptoms. Moreover, in all monkeys, demyelinated lesions were present in the white matter and in two cases also in the cortical grey matter. Immune profiling at height of the disease showed a dominant T cell response against the overlapping peptides 14–36 and 24–46, but reactivity against the pathogenically most relevant peptide 34–56 was conspicuously absent. In the second experiment, there was an indication for a possible suppressive mechanism. Conclusions Immunization of marmoset monkeys with rhMOG in IFA elicits clinical EAE in all animals. Moreover, rhMOG contains pathogenic and regulatory epitopes, but the pathogenic hierarchy of rhMOG epitopes is strongly influenced by the adjuvant in which the protein is formulated.

• Publisher: BioMed Central,BioMed Central Ltd
• Subject: Analysis / Animals / Antibodies - blood / Antigenic determinants / Autoimmunity / B cells / Biomedical and Life Sciences / Biomedicine / Brain - metabolism / Brain - pathology / Callithrix / Care and treatment / Cell Proliferation - drug effects / Complications and side effects / Cytokines - blood / Cytokines - genetics / Disease Models, Animal / Encephalomyelitis, Autoimmune, Experimental - etiology / Encephalomyelitis, Autoimmune, Experimental - immunology / Encephalomyelitis, Autoimmune, Experimental - pathology / Female / Freund's Adjuvant - adverse effects / Freund's Adjuvant - immunology / Humans / Immunization - adverse effects / Immunology / Leukocytes, Mononuclear - metabolism / Leukocytes, Mononuclear - pathology / Lipids - adverse effects / Lipids - immunology / Lymphocyte Activation - immunology / Multiple sclerosis / Myelin proteins / Myelin Sheath - metabolism / Myelin Sheath - pathology / Myelin-Oligodendrocyte Glycoprotein - adverse effects / Myelin-Oligodendrocyte Glycoprotein - immunology / Neurobiology / Neurology / Neurosciences / Peptides / Peptides - adverse effects / Peptides - immunology / Recombinant Proteins - adverse effects / Recombinant Proteins - immunology / Spinal Cord - metabolism / Spinal Cord - pathology / T cells / T-Lymphocytes - immunology