Contribution of host radioresistant T cells to the clonal elimination of minor lymphocyte stimulatory-1a reactive T cells in mouse bone marrow chimeras

Cell Immunol. 1994 Jun;156(1):13-23. doi: 10.1006/cimm.1994.1149.


When bone marrow (BM) cells from I-E+ and minor lymphocyte stimulatory (Mls) antigen (Ag) disparate mice (Mls-1b) were transplanted to lethally irradiated Mls-1a mice, Mls-1a reactive T cells were found to be completely deleted from the developing thymocyte population in these [Mls-1b-->Mls-1a] radiation chimeras. It has been shown that BM-derived class II (Ia) positive cells play an essential role in this clonal deletion. Thus, Mls-1a Ag appeared to have been transferred from recipient cells to the Ia+ cells derived from donor BM. These Mls-1a-Ia complexes appear to be responsible for elimination of the Mls-1a reactive T cells that have also been derived from donor BM. However, definition of the cells of the recipient that generate the Mls-1a Ag and transfer them to the BM-derived Ia+ cells has remained unclear to date. In the analysis described herein, we have investigated the tolerogenicity of Mls-1a Ag derived from host T cells which represent a major population of radioresistant cells in the [Mls-1b-->Mls-1a] chimeras. When recipient T cells that had been collected and purified from spleens of [Mls-1b-->Mls-1a] chimeras were administered i.v. into [Mls-1b] chimeras, Mls-1a reactive V beta 6+, V beta 8.1+, or V beta 9+ T cells were completely eliminated. Thus, residual radioresistant host T cells present in the radiation BM chimeras are the cells which produce the Mls-1a Ag. These Mls-1a Ags ultimately contribute to the clonal elimination of Mls-1a reactive T cells from the developing thymocyte population. The present findings indicate that recipient T cells which can survive lethal irradiation and produce intrinsic superantigens alter eventually the T cell repertoire in the thymus which have been developing from precursors of donor BM.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • B-Lymphocytes / immunology
  • Bone Marrow Transplantation / immunology*
  • Clonal Deletion
  • Gene Rearrangement, beta-Chain T-Cell Antigen Receptor
  • Immune Tolerance
  • Mice
  • Mice, Inbred AKR
  • Mice, Inbred Strains
  • Minor Lymphocyte Stimulatory Antigens / immunology*
  • Radiation Chimera
  • Receptors, Antigen, T-Cell / immunology*
  • T-Lymphocyte Subsets / immunology*
  • T-Lymphocyte Subsets / radiation effects


  • Minor Lymphocyte Stimulatory Antigens
  • Receptors, Antigen, T-Cell