title: [Peripheral pool of CD8+ T-cells contains lymphocytes with antigen-specific receptors that recognize syngeneic MHC class II molecules].
abstract: The capacity of T-lymphocytes to recognize "nonself" and tolerating "self" is formed as a result of positive and negative selection in the thymus. While obtaining and testing specificity of T-hybridomas, we demonstrated that the major part of peripheral pool of CD8+ T-lymphocytes carried receptors specific to "self" MHC class II molecules. Such an unexpected specificity of receptors has been found in some T-cell hybridomas produced by fusion of activated peripheral CD8+ T-lymphocytes with a tumor partner transfected by the coreceptor CD4 gene. The reactivity to "self" is not an experimental artifact due to an increased avidity of interaction of the hybridoma cells with antigen-presenting cells. Also, it is not an expression of reactivity of T-cells to superantigens, products of endogenous viruses of mouse breast cancer. The formation of a pool of such T-cells involves both cells with double receptor specificity and cells coexpressing two alpha-chains of T-cell receptor. Their appearance in the periphery can be due to the capacity of thymocytes differentiating in the direction of CD4+ cells to avoid negative selection via change of expression of coreceptor CD4 to CD8.
authors.forename: L A
authors.initials: LA
authors.lastname: Pobezinskiĭ
authors.forename: E L
authors.initials: EL
authors.lastname: Pobezinskaia
authors.forename: T S
authors.initials: TS
authors.lastname: Grinenko
authors.forename: A V
authors.initials: AV
authors.lastname: Chervonskiĭ
authors.forename: D B
authors.initials: DB
authors.lastname: Kazanskiĭ
mesh_terms: D000818:Animals; D017951:Antigen Presentation / Q000276:immunology; D015551:Autoimmunity / Q000276:immunology*; D015704:CD4 Antigens / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D002454:Cell Differentiation / Q000276:immunology; D002478:Cells, Cultured; D015395:Histocompatibility Antigens Class I / Q000276:immunology; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006825:Hybridomas / Q000276:immunology; D007376:Interleukin-2 / Q000276:immunology / Q000378:metabolism; D051379:Mice; D008815:Mice, Inbred Strains; D011948:Receptors, Antigen, T-Cell / Q000276:immunology*; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000276:immunology
chemical_list: D015704:CD4 Antigens; D015395:Histocompatibility Antigens Class I; D000949:Histocompatibility Antigens Class II; D007376:Interleukin-2; D011948:Receptors, Antigen, T-Cell; D016693:Receptors, Antigen, T-Cell, alpha-beta