Journal
IMMUNITY
Volume 25, Issue 4, Pages 631-641Publisher
CELL PRESS
DOI: 10.1016/j.immuni.2006.08.018
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Funding
- NIDDK NIH HHS [DK 54451] Funding Source: Medline
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The immune system preserves and makes use of autoreactive lymphocytes with specialized functions. Here we showed that one of these populations, CD8 alpha alpha+TCR alpha beta(+) intestinal intraepithelial lymphocytes (IELs), arose from a unique subset of double-positive thymocytes. This subset of cells was precommitted to preferentially give rise to CD8 alpha alpha+TCR alpha beta(+) IELs, but they required exposure to self-agonist peptides. The agonist-selected TCR alpha beta(+) thymocytes are CD4 and CD8 double-negative, and their final maturation, including the induction of CD8 alpha alpha expression, appeared to occur only after thymus export in the IL-15-rich environment of the gut. These developmental steps, including precommitment of immature thymocytes, TCR-mediated agonist selection, and postthymic differentiation promoted by cytokines, define a unique pathway for the generation of CD8 alpha alpha a(+)TCR alpha beta(+) IEL.
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