A murine early thymocyte developmental sequence is marked by transient expression of the interleukin 2 receptor.
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Discussion
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Implication
Laboratory study demonstrates a developmental sequence marked by transient interleukin 2 receptor expression in murine thymocytes, highlighting a pivotal stage for gene rearrangement.
Key Points
- Determine the maturation sequence of murine double-negative thymocytes using cell surface markers, gene rearrangement status, and developmental potential.
- Analyzed murine CD4- CD8- double-negative thymocytes expressing high levels of heat-stable antigen.
- Fractionated thymocyte subpopulations according to differential expression of phagocytic glycoprotein 1 (Pgp-1) and interleukin 2 receptor (IL-2R).
- Characterized subsets by measuring T-cell receptor gene rearrangements, cell cycle kinetics, and thymic reconstitution capacity.
- Defined a linear developmental pathway proceeding from IL-2R- Pgp-1+ to IL-2R+ Pgp-1- and resolving to IL-2R- Pgp-1- prior to CD4 and CD8 expression.
- Identified transient IL-2R expression as a key transition point directly preceding a major proliferative burst and the loss of thymus reconstitution ability.
- Demonstrated that early precursor cells possess partial TCR C-beta-1 rearrangements, while IL-2R expression triggers a second wave of beta-chain rearrangement and activates alpha- and beta-chain expression.
Cite This Study
Pearse et al. (1989) studied this question.