Two-domain MHC class II molecules form stable complexes with myelin basic protein 69-89 peptide that detect and inhibit rat encephalitogenic T cells and treat experimental autoimmune encephalomyelitis.

We designed and expressed in bacteria a single-chain two-domain MHC class II molecule capable of binding and forming stable complexes with antigenic peptide. The prototype "beta1alpha1" molecule included the beta1 domain of the rat RT1.B class II molecule covalently linked to the amino terminus of the alpha1 domain. In association with the encephalitogenic myelin basic protein (MBP) 69-89 peptide recognized by Lewis rat T cells, the beta1alpha1/MBP-69-89 complex specifically labeled and inhibited activation of MBP-69-89 reactive T cells in an IL-2-reversible manner. Moreover, this complex both suppressed and treated clinical signs of experimental autoimmune encephalomyelitis and inhibited delayed-type hypersensitivity reactions and lymphocyte proliferation in an Ag-specific manner. These data indicate that the beta1alpha1/MBP-69-89 complex functions as a simplified natural TCR ligand with potent inhibitory activity that does not require additional signaling from the beta2 and alpha2 domains. This new class of small soluble polypeptide may provide a template for designing human homologues useful in detecting and regulating potentially autopathogenic T cells.

• Publication year

  1998

• Venue

  Journal of Immunology

• Publication date

  1998-12-01

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.4049/jimmunol.161.11.5987PMID 9834080
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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