Eradication of B-CLL by autologous and allogeneic host nonreactive anti-third-party CTLs

Fabian D. Arditti, Shraga Aviner, Benjamin Dekel, Rita Krauthgamer, Judith Gan, Arnon Nagler, Antonio Tabilio, Massimo Martelli, Alain Berrebi, Yair Reisner

Research output: Contribution to journalArticlepeer-review

Abstract

Establishment of cell lines capable of killing leukemia cells, in the absence of alloreactivity against normal host cells, represents a most desirable goal in bone marrow transplantation (BMT) and cancer immunotherapy. By using a human → mouse chimeric model, we demonstrate that allogeneic anti-third-party cytotoxic T lymphocytes (CTLs) depleted of alloreactivity are endowed with a potent anti-B-cell chronic lymphocytic leukemia (B-CLL) reactivity. Likewise, CTL preparations generated from autologous T cells of the same patients with B-CLL exhibited comparable leukemia eradication, suggesting that the reactivity of allogeneic anti-third-party CTLs is not mediated by residual antihost clones. This specificity was also exhibited in vitro, and annexin staining revealed that B-CLL killing is mediated by apoptosis. While the CTLs killing of third-party cells could be blocked by anti-CD3 antibody, the lysis of the B-CLL cells was not inhibited by this antibody, suggesting a T-cell receptor (TCR)-independent cytotoxicity. The role of cell contact leading to apoptosis of B-CLL cells is shown in transwell plates and by anti-lymphocyte function-associated antigen-1 (LFA-1)-blocking antibody. Up-regulation of CD54 and the subsequent apoptosis of B-CLL cells depend on the initial LFA-1/ICAM-1 (intercellular adhesion molecule 1) interaction. Taken together, these results suggest that allogeneic or autologous host nonreactive anti-third-party CTLs may represent a new therapeutic approach for patients with B-CLL.

Original languageEnglish
Pages (from-to)3365-3371
Number of pages7
JournalBlood
Volume105
Issue number8
DOIs
StatePublished - 15 Apr 2005

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