Abstract
Malignant B lymphocytes from chronic lymphocytic leukemia (CLL) patients maintain the capacity to respond to CD40 ligation, among other microenvironmental stimuli. In this study, we show that (i) leukemic CLL cells stimulated with the soluble form of CD40L in vitro show differential responses in terms of upregulation of surface markers (CD95 and CD80) and induction of chemokines (CCL22 and CCL17) expression/secretion, and that (ii) these changes are mirrored by a distinct activation of intracellular signalling pathways including increase in IKKalpha/beta phosphorylation and upregulation of antiapoptotic proteins (BCL-2 and MCL-1). CLL patients can then be segregated into two distinct functional subsets. We defined the responsive subset of cases CD40L dependent, considering the capacity to respond as a sign of persistent need of this stimulation for the leukemic expansion. Conversely, we named the unresponsive cases CD40L independent, considering them less dependent on this microenvironmental signal, presumably because of a higher autonomous proliferative and survival potential. Importantly, we report that (iii) the two functional subsets show an opposite clinical outcome, with CD40L-independent cases having a shorter time to progression. This indicates that the functional differences observed in vitro may reflect a different leukemic potential in vivo likely responsible for a distinct clinical course.
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Change history
09 November 2011
This article has been corrected since advance Online Publication, and a corrigendum is also printed in this issue
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Acknowledgements
We thank Luisa Granziero, Paola Circosta, Massimo Geuna and Giuseppe Guida for helpful suggestions and technical support. This project was supported by: Associazione Italiana per la Ricerca sul Cancro AIRC (Investigator Grant and Special Program Molecular Clinical Oncology—5 per mille #9965), ‘CLLGRF—U.S./European Alliance for the Therapy of CLL’, FIRB and PRIN—Ministero Istruzione, Università e Ricerca (MIUR), Roma, Progetti Integrati Oncologia (PIO)—Ministero della Salute, Roma. CS is supported by the EHA Fellowship Program (2009/18), AJ is supported by a EHA Partner Fellowship Program.
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This article has been corrected since advance Online Publication, and a corrigendum is also printed in this issue
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Scielzo, C., Apollonio, B., Scarfò, L. et al. The functional in vitro response to CD40 ligation reflects a different clinical outcome in patients with chronic lymphocytic leukemia. Leukemia 25, 1760–1767 (2011). https://doi.org/10.1038/leu.2011.149
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DOI: https://doi.org/10.1038/leu.2011.149
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