CD4+8- AND CD4-8+ MATURE THYMOCYTES REQUIRE DIFFERENT POST-SELECTION PROCESSING FOR FINAL DEVELOPMENT
- Author(s)
- PETRIE, HT; Strasser, A; Harris, AW; HUGO, P; Shortman, K;
- Details
- Publication Year 1993-08-01,Volume 151,Issue #3,Page 1273-1279
- Journal Title
- JOURNAL OF IMMUNOLOGY
- Publication Type
- Journal Article
- Abstract
- Two primary types of TCR-alpha/beta+ T cells are found in the peripheral lymphoid system; CD4+8- T cells, with MHC-class II restricted TCR, and CD4-8+ T cells, which are MHC-class I restricted. Both lineages develop in the thymus from a series of common precursors. However, the precise stage at which they diverge, and the combination of factors that regulates such divergence, are not well defined. The up-regulation of CD3/TCR to high mature levels is thought to be an early event associated with positive selection for self-MHC recognition. Using purified cells from bcl-2 transgenic mice in order to overcome the limitations imposed by cell death on normal thymocytes, we find that a minor subset of CD4+8+ thymocytes expressing high levels of CD3/TCR gives rise to both CD4+8- and CD4-8+ mature cells upon intrathymic transplantation, but only to CD4-8+ in culture. Thus, in addition to demonstrating the dual lineage potential of this subset, these findings show that additional post-selection processing events are required for the production of mature thymocytes, and that CD4+8- and CD4-8+ subsets differ in the types of processing required.
- Publisher
- AMER ASSOC IMMUNOLOGISTS
- Keywords
- T-CELL-RECEPTOR; IMMATURE THYMOCYTES; TRANSGENIC MICE; ALPHA-BETA; INTERLEUKIN-2 RECEPTOR; NEGATIVE SELECTION; POSITIVE SELECTION; BCL-2; EXPRESSION; KINETICS
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- Refer to copyright notice on published article.
Creation Date: 1993-08-01 12:00:00