Immunological consequences of T cell-specific expression of H-2Kb molecules in transgenic mice

S. J. Simpson, P. Tomlinson, A. L. Mellor

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

CBA (H-2k) mice carrying a H-2Kb transgene (CD2Kb) linked to transcriptional control elements from the human CD2 gene express H-2Kb at high levels on all thymocytes and peripheral T cells. However, skin grafts from two independent transgenic lineages, CD2Kb-2 and CD2Kb-3, are not rejected by recipient CBA mice. Although mice from both lineages tolerate H-2Kb disparate skin grafts, tolerance is maintained by different mechanisms because H-2Kb-specific cytotoxic T cells cannot be generated in vitro using CD2Kb-2 responder spleen cells, but can be generated when responder cells are from CD2Kb-3 mice. Furthermore, H-2Kb-restricted cytotoxic T cell responses directed against minor histocompatlbillty antigens can be obtained from CD2Kb-2 responder mice. Thus, negative and positive selection of immature thymocytes seems to take place in CD2Kb-2 mice, even though the pattern of H-2Kb expression is modified by the CD2Kb transgene. In contrast, H-2Kb-specific cytotoxic T cell precursors are not eliminated in CD2Kb-3 mice, even though all thymocytes express H-2Kb in these mice. However, these potentially autoreactive H-2Kb-specific T cells are apparently inactive in vivo and fail to lyse syngeneic CD2Kb-3 target cells in vitro, even when activated to lyse other H-2Kb-expressing cells. These results reveal that tolerance in CD2Kb-3 mice is induced either by a non-deletional mechanism or by partial elimination of a subset of cytotoxlc T cell precursors capable of recognizing H-2Kb as a target antigen.

Original languageEnglish (US)
Pages (from-to)189-198
Number of pages10
JournalInternational Immunology
Volume5
Issue number2
DOIs
StatePublished - Feb 1 1993

Keywords

  • Major histocompatibility complex
  • Tolerance

ASJC Scopus subject areas

  • Immunology

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