Differential expression of APO-1 on human thymocytes: implications for negative selection?

Negative selection during T cell ontogeny involves selective induction of apoptosis in thymocytes. In peripheral lymphoid cells, apoptosis may be mediated via the APO-1 pathway. Here we report that APO-1 is constitutively expressed on the vast majority of human thymocytes but down-regulated at a mat...

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Hauptverfasser: Debatin, Klaus-Michael (VerfasserIn) , Süss, Dorothee (VerfasserIn) , Krammer, Peter H. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: March 1994
In: European journal of immunology
Year: 1994, Jahrgang: 24, Heft: 3, Pages: 753-758
ISSN:1521-4141
DOI:10.1002/eji.1830240339
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1002/eji.1830240339
Verlag, lizenzpflichtig, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/eji.1830240339
Volltext
Verfasserangaben:Klaus-Michael Debatin, Dorothee Süss, Peter H. Krammer

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520 |a Negative selection during T cell ontogeny involves selective induction of apoptosis in thymocytes. In peripheral lymphoid cells, apoptosis may be mediated via the APO-1 pathway. Here we report that APO-1 is constitutively expressed on the vast majority of human thymocytes but down-regulated at a mature stage of thymocyte development (TCRhi). This stage of development is characterized by CD28hi, CD44hi, CD69hi and up-regulation of Bcl-2 protein. We define a new thymocyte subpopulation that expresses high levels of APO-1 and intermediate levels of T cell receptor α/β (TCRim/APO-1hi). The TCRim/APO-1hi population contains a large fraction of dead cells, suggesting that the APO-1 pathway may be involved in negative selection of at least a fraction of thymocytes after intrathymic activation. 
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