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The Journal of Immunology, Vol 156, Issue 10 3587-3590, Copyright © 1996 by American Association of Immunologists


CUTTING EDGE

Shortened telomeres in clonally expanded CD28-CD8+ T cells imply a replicative history that is distinct from their CD28+CD8+ counterparts

J Monteiro, F Batliwalla, H Ostrer and PK Gregersen
Department of Medicine, North Shore University Hospital/Cornell University Medical College, Manhasset, NY 11030, USA.

Long term in vitro culture of clonally expanded CD8+T cells, generally found within the CD57+ or CD28-subset, has generally been unsuccessful, suggesting that these cells may have a limited replicative potential. Telomeric shortening may reflect the action of a "mitotic clock" regulating the number of divisions a cell can undergo. In this study, we have compared the telomeric lengths of CD28-CD8+ and CD28+CD8+ T cells in 10 normal individuals to assess their replicative history. Overall, the telomeric lengths were found to be significantly shorter in the CD28-CD8+ T cell subset compared with the CD28+CD8+ subset. Furthermore, clonally expanded TCRBV11+CD8+ T cells from an individual exhibited telomeric lengths that were 2.9 kb shorter than those found in the polyclonal CD28+CD8+ T cell subset. These findings indicate that clonally expanded CD28-CD8+ T cells have undergone many more rounds of replication than CD28+CD8+ T cells, and consistent with the loss of CD28 expression, they may have reached a state of replicative senescence.


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