Attenuation of CD8+ T-cell function by CD4+CD25 + regulatory T cells in B-cell non-Hodgkin's lymphoma

Zhi Zhang Yang, Anne J. Novak, Steven C. Ziesmer, Thomas E. Witzig, Stephen M. Ansell

Research output: Contribution to journalArticlepeer-review

137 Scopus citations


The underlying mechanisms by which tumor cells are resistant to CTL-mediated apoptosis are not clear. Using a human model of B-cell non-Hodgkin's lymphoma (B-cell NHL), we show that intratumoral Treg cells inhibit the proliferation and granule production of activated autologous infiltrating CD8+ T cells. Our results also show that degranulation and subsequent cytotoxic activity of infiltrating CD8+ T cells exposed to lymphoma B cells is completely attenuated by the presence of intratumoral Treg cells. Furthermore, we show that increased numbers of intratumoral Treg cells correlates with the number of CD8 + T cells in biopsy specimens from patients with B-cell NHL, supporting the in vitro findings that intratumoral Treg cells inhibit proliferation of infiltrating CD8+ T cells. Taken together, these data indicate that human lymphoma B cells are sensitive to autologous CTL-mediated cell death but are protected by the inhibitory function of intratumoral Treg cells.

Original languageEnglish (US)
Pages (from-to)10145-10152
Number of pages8
JournalCancer research
Issue number20
StatePublished - Oct 15 2006

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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