Abstract:
:The T-cell repertoire is shaped by the positive and negative selection of immature CD4(+) CD8(+) double positive (DP) thymocytes. Positive selection of DP T cells to the CD4(+) CD8(-) and CD4(-) CD8(+) simple positive (SP) lineages is a multistep process which involves cellular interactions between thymocytes and stromal cells. Mutant nackt (nkt/nkt) mice have been shown to have a deficiency in the CD4(+) CD8(-) T-cell subset both in the thymus and in the periphery. The present report suggests that nkt/nkt mice present alterations in early steps of positive selection because they show decreases in the percentages of CD69(+) and CD5(+) cells within the DP subset. Experiments involving bone marrow transfer and thymic chimeras demonstrate that the thymic epithelium of nkt/nkt mice is involved in the alterations registered during positive selection and dictates the ultimate fate of CD4(+) SP cells.
journal_name
Scand J Immunoljournal_title
Scandinavian journal of immunologyauthors
Nepomnaschy I,Lombardi G,Bekinschtein P,Berguer P,Francisco V,de Almeida J,Buggiano V,Pasqualini CD,Piazzon Idoi
10.1046/j.1365-3083.2000.00818.xkeywords:
subject
Has Abstractpub_date
2000-12-01 00:00:00pages
555-62issue
6eissn
0300-9475issn
1365-3083pii
sji818journal_volume
52pub_type
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