Abstract
The thymus is the primary site of T-cell lymphopoiesis. However, the precise molecular interactions that enable the thymus to carry out this function are only recently being elucidated. Although several important molecular players have been identified, including soluble factors, extracellular matrix components, and integral membrane receptors and their ligands, the precise role of these molecules in thymocyte differentiation has yet to be fully characterized. In this regard, the advent of a simple and efficient culture system for the generation of T cells from stem cells, as discussed here, should greatly facilitate the study of T-cell development.
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Acknowledgements
I thank the Canadian Institutes for Health Research and the National Cancer Institute of Canada for their support. Apologies to all colleagues whose work was not cited owing to space constraints.
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Glossary
- AUTOIMMUNE REGULATOR
-
(AIRE). A transcription factor that promotes the ectopic expression of peripheral tissue-restricted antigens by medullary epithelial cells of the thymus.
- NEGATIVE SELECTION
-
The deletion of self-reactive thymocytes in the thymus. Thymocytes that express T-cell receptors that strongly recognize self-peptide bound to self-MHC molecules undergo apoptosis in response to the signalling generated by high-affinity binding.
- OP/OP MICE
-
These mice are deficient in macrophage colony- stimulating factor (MCSF) owing to a naturally occurring recessive mutation, osteopetrosis (op), in the coding region of the MCSF gene.
- POSITIVE SELECTION
-
The maturation of immature CD4+CD8+ precursor thymocytes induced by T-cell receptor (TCR) signals that result from binding to self-peptide–MHC ligands on thymic epithelial cells. This process selects thymocytes that express TCRs that can interact with self-MHC moelcules.
- SMALL INTERFERING RNA
-
(siRNA). RNA interference (RNAi) is a phenomenon by which the expression of a specific gene is inhibited when a double-stranded complementary RNA (siRNA) is introduced into the organism.
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Zúñiga-Pflücker, J. T-cell development made simple. Nat Rev Immunol 4, 67–72 (2004). https://doi.org/10.1038/nri1257
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DOI: https://doi.org/10.1038/nri1257
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