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The Journal of Immunology, Vol 146, Issue 4 1113-1117, Copyright © 1991 by American Association of Immunologists
ARTICLES |
HI Levitsky, PT Golumbek and DM Pardoll
Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD 21205.
CD4-8- TCR-alpha beta+ thymocytes represent a distinct population whose fate and function have remained a mystery. We show here that this thymocyte subset bears NK1, a surface Ag previously thought to be expressed exclusively by TCR- NK cells. Analysis of peripheral lymphocytes for the coexpression of TCR-alpha beta and NK1 revealed a subset with similar characteristics to the NK1+ thymocytes: a large fraction that are CD4-8- and a skewed TCR repertoire in which V beta 8 is overrepresented. Thymus transplant experiments into congenically marked athymic (nude) mice revealed that the NK1+TCR alpha beta+ subset was exclusively thymus derived and represented a distinct subset from the thymus-independent NK1+TCR- population. Finally, the NK1+TCR alpha beta+ population preferentially localizes to the bone marrow. These results demonstrate that this T cell subset is exported to the periphery after developing in the thymus. Their unique surface Ag expression and tissue localization suggest an immune function distinct from classical T cells.
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