Clonal Expansion Within the CD4+CD57+ and CD8+CD57+ T Cell Subsets in Chronic Lymphocytic Leukemia

Davide Serrano, Joanita Monteiro, Steven L. Allen, Jonathan Kolitz, Philip Schulman, Stuart M. Lichtman, Aby Buchbinder, Vincent P. Vinciguerra, Nicholas Chiorazzi, Peter K. Gregersen

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The role of T cells in chronic lymphocytic leukemia (CLL) has not been extensively investigated, since the most prominent cellular abnormality in CLL involves the clonal expansion of B cells. In this study we have undertaken a comprehensive analysis of the CD4+ and CD8+ T cell repertoire in a population of CLL patients (n = 19) and age-matched controls (n = 22). The TCR repertoire analysis was performed using a multiplex PCR assay for CDR3 length, an approach that allows for the detection of underlying oligoclonality in complex T cell populations. We established that oligoclonality was substantially more frequent in both the CD4+ and CD8+ T cell populations of CLL patients than in the age-matched controls (p <0.001). Using three-color FACS analysis with a panel of TCRV segment-specific mAbs, we also established that oligoclonal expansions are predominantly found in the CD57+ subset of both the CD4+ and CD8+ T cell populations. The frequency of the CD57 marker on CD4+ T cells was increased in the setting of CLL (% CD57 = 14.8 ± 13.0%) compared with that in normal controls (% CD57 = 3.3 ± 3.0%; p <0.001). An elevated frequency of CD4+CD57+ T cells was correlated with more advanced disease. Similarly, the most extreme oligoclonal expansions of CD4+CD57+ T cells occurred in CLL patients who had progressed beyond Rai stage 0. These data document profound alterations in the T cell repertoire of CLL patients and point to a role for clonal T cell populations in the pathogenesis of this disease.

Original languageEnglish
Pages (from-to)1482-1489
Number of pages8
JournalJournal of Immunology
Issue number3
Publication statusPublished - Feb 1 1997

ASJC Scopus subject areas

  • Immunology


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