Journal
BLOOD
Volume 117, Issue 16, Pages 4323-4327Publisher
AMER SOC HEMATOLOGY
DOI: 10.1182/blood-2010-11-315705
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Funding
- Specialized Center of Research from the Leukemia & Lymphoma Society
- National Cancer Institute [K12 CA133250, P50 CA140158, P01 CA95426, P01 CA101956]
- D. Warren Brown Foundation
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In patients with chronic lymphocytic leukemia (CLL), lenalidomide can promote humoral immune responses but also induces a distinct disease-specific toxicity of tumor flare and cytokine release. These CLL-specific events result from increased expression of costimulatory molecules on B cells. Here we demonstrate that lenalidomide activation of CLL cells depends on the phosphatidylinositol 3-kinase p110 delta (PI3K-delta) pathway. Inhibition of PI3K-delta signaling by the PI3K-delta-inhibiting drug, CAL-101, or by siRNA knockdown of p110 delta, abrogates CLL cell activation, costimulatory molecule expression, and vascular endothelial growth factor and basic fibroblast growth factor gene expression that is induced by lenalidomide. In addition, CAL-101 attenuates lenalidomide-mediated increases in immunoglobulin M production by normal B cells. Collectively, these data demonstrate the importance of PI3K-delta signaling for lenalidomide immune modulation. These findings may guide development of strategies for the treatment of CLL that combine lenalidomide with CAL-101, with other inhibitors of the PI3K-delta pathway, or with other agents that target downstream kinases of this signaling pathway. (Blood. 2011;117(16): 4323-4327)
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