American Association for Cancer Research
10780432ccr131037-sup-fig_s2.pdf (805.22 kB)

Supplementary Figure 2 from CD62L as a Therapeutic Target in Chronic Lymphocytic Leukemia

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journal contribution
posted on 2023-03-31, 17:26 authored by Melinda Burgess, Devinder Gill, Richa Singhania, Catherine Cheung, Lynne Chambers, Brent A. Renyolds, Louise Smith, Peter Mollee, Nicholas Saunders, Nigel AJ McMillan

Supplementary Figure 2 - PDF files 805K, Correlation of CD62L antibody responses and clinical parameters



Purpose: Despite advances in the treatment of chronic lymphocytic leukemia (CLL), the disease remains incurable with standard therapies and relapse is inevitable. A growing body of evidence indicates that alterations in the adhesion properties of neoplastic cells play a pivotal role in the development and progression of CLL.Experimental Design: The expression of 71 cell surface molecules was examined on CLL peripheral blood mononuclear cells (PBMCs) over 3 weeks in culture. The most highly upregulated marker, CD62L, was examined further for expression on CD5+/CD19+ CLL cells in vitro and in lymph node and bone marrow biopsies. The prosurvival role of CD62L was examined using a functional blocking antibody and therapeutic potential evaluated by comparison with current chemotherapy agents.Results: Blocking CD62L resulted in apoptosis of CLL cells but not PBMCs from healthy donors suggesting a novel role for CD62L in CLL cell survival. The beneficial effect of coculturing CLL cells with bone marrow stromal cells or endothelial cells does not protect CLL cells from anti-CD62L–related toxicity. Moreover, combining fludarabine or mafosfamide with the anti-CD62L in vitro produced an additive effect both with and without stromal cells.Conclusion: This is the first reported data showing that blocking the activation and homing marker, CD62L, regulates CLL cell survival in vitro. These data also suggest that therapeutic antibodies against CD62L may provide additional clinical benefit to patients with CLL receiving current standard chemotherapy protocols. Clin Cancer Res; 19(20); 5675–85. ©2013 AACR.

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