K. Yasutomo et al., TCR signaling for initiation and completion of thymocyte positive selection has distinct requirements for ligand quality and presenting cell type, J IMMUNOL, 165(6), 2000, pp. 3015-3022
Thymocyte selection involves signaling by TCR engaging diverse self-peptide
:MHC molecule ligands on various cell types in the cortex and medulla, Here
we separately analyze early and late stages of selection to better underst
and how presenting cell type, ligand quality, and the timing of TCR signali
ng contribute to intrathymic differentiation. TCR transgenic CD4(+)CD8(+) t
hymocytes (double positive (DP)) from MHC-deficient mice were stimulated us
ing various presenting cells and ligands, The resulting CD69(high) cells we
re isolated and evaluated for maturation in reaggregate cultures with wild-
type or MHC molecule-deficient thymic stroma with or without added hemopoie
tic dendritic cells (DC), Production of CD4(+) T cells required TCR signali
ng in the reaggregates, indicating that transient recognition of self-ligan
ds by DP is inadequate for full differentiation. DC bearing a potent agonis
t ligand could initiate positive selection, producing activated thymocytes
that matured into agonist-responsive T cells in reaggregates lacking the sa
me ligand, DC could also support the TCR signaling necessary for late matur
ation. These results argue that despite the negative role assigned to DC in
past studies, neither the peptide:MHC molecule complexes present on DC nor
any other signals provided by these cells stimulate only thymocyte death.
These findings also indicate that unique epithelial ligands are not necessa
ry for positive selection. They provide additional insight into the role of
ligand quality in selection events and support the concept that following
initiation of maturation from the DP state, persistent TCR signaling is cha
racteristic of and perhaps required by T cells.