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Journal of Experimental Medicine, Vol 181, 649-655, Copyright © 1995 by Rockefeller University Press
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H Kishimoto, CD Surh and J Sprent
Department of Immunology, Scripps Research Institute, La Jolla, California 92037.
Using terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling (TUNEL) to detect cells undergoing early apoptosis, we have defined the surface markers expressed on CD4+CD8+ thymocytes undergoing spontaneous or steroid-induced apoptosis in tissue culture. Some surface markers, e.g., CD4, CD8, and heat stable antigen, are downregulated on apoptotic thymocytes. Surprisingly, however, other markers are upregulated; this applies to T cell receptor beta/CD3, CD69, and CD25 expression. Upregulation of these markers is restricted to a discrete subset of apoptotic cells.
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