Protective DNA vaccination against organ-specific autoimmunity is highly specific and discriminates between single amino acid substitutions in the peptide autoantigen
2000 (English)In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 97, no 4, 1689-1694 p.Article in journal (Other academic) Published
DNA vaccines that encode encephalitogenic sequences in tandem can protect from subsequent experimental autoimmune encephalomyelitis induced with the corresponding peptide. The mechanism for this protection and, in particular, if it is specific for the amino acid sequence encoding the vaccine are not known. We show here that a single amino acid exchange in position 79 from serine (nonself) to threonine (self) in myelin basic protein peptide MBP68-85, which is a major encephalitogenic determinant for Lewis rats, dramatically alters the protection. Moreover, vaccines encoding the encephalitogenic sequence MBP68-85 do not protect against the second encephalitogenic sequence MBP89-101 in Lewis rats and vice versa. Thus, protective immunity conferred by DNA vaccination exquisitely discriminates between peptide target autoantigens. No bystander suppression was observed. The exact underlying mechanisms remain elusive because no simple correlation between impact on ex vivo responses and protection against disease were noted.
Place, publisher, year, edition, pages
2000. Vol. 97, no 4, 1689-1694 p.
Animals, Autoantigens/*immunology, Cell Division/immunology, DNA/genetics/immunology, Encephalomyelitis; Autoimmune; Experimental/genetics/*immunology, Epitopes, Immunization, Molecular Sequence Data, Myelin Basic Proteins/genetics/*immunology, Peptide Fragments/chemistry/*immunology, Rats, Rats; Inbred Lew, Research Support; Non-U.S. Gov't, Spleen/immunology, T-Lymphocytes/immunology, Vaccines; DNA/genetics/*immunology
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:uu:diva-70098PubMedID: 10677519OAI: oai:DiVA.org:uu-70098DiVA: diva2:98009