Journal
BRITISH JOURNAL OF HAEMATOLOGY
Volume 153, Issue 2, Pages 199-211Publisher
WILEY
DOI: 10.1111/j.1365-2141.2010.08507.x
Keywords
chronic lymphocytic leukaemia; dasatinib; B cell antigen receptor signalling; HSP90 inhibition; microenvironment
Categories
Funding
- Tenovus-Scotland
- Medical Research Council (MRC)
- MRC [G0701354] Funding Source: UKRI
- Chief Scientist Office [CZB/4/748] Funding Source: researchfish
- Medical Research Council [G0701354] Funding Source: researchfish
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P>As antigenic stimulation of the B cell antigen receptor (BCR) is key to chronic lymphocytic leukaemia (CLL) pathogenesis, targeting dysregulated kinases involved in BCR signalling is an attractive therapeutic approach. We studied the effects of the Src/c-Abl tyrosine kinase inhibitor dasatinib on BCR signal transduction in CLL cells. Treatment of CLL cells with 100 nmol/l dasatinib induced apoptosis by an average reduction in viability of 33 center dot 7% at 48 h, with dasatinib sensitivity correlating with inhibition of SykY348 phosphorylation. Dasatinib inhibited calcium flux, phosphatidylinositol-3-kinase and mitogen-activated protein kinase activation following BCR crosslinking, and blocked the Mcl-1-dependent increase in CLL cell survival on prolonged BCR stimulation. However, the pro-apoptotic effect of dasatinib was abrogated by stromal cell contact alone or in the presence of CD154 and interleukin (IL)-4 (CD154L/IL-4 system). Whilst dasatinib retained the ability to sensitize CLL cells in stromal co-culture to both fludarabine and chlorambucil, the addition of CD154 and IL-4 rendered cells resistant to these drug combinations. We demonstrate that the HSP90 inhibitor 17-DMAG exhibited synergy with dasatinib in vitro, and moreover, induced apoptosis of CLL cells in the CD154L/IL-4 system. Our data provide evidence that dasatinib would be most clinically effective in combination with agents able to target antigen-independent microenvironmental signals.
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