Abstract
An elevated level of fibroblast growth factor-2 (FGF-2) in peripheral blood is considered to play a role in regulating the growth of leukemia cells. Here, we show that the level of plasma FGF-2 is increased in 54% of B cell chronic lymphocytic leukemias (B-CLL) and in 44% of chronic myeloid leukemias (CML). Notably, white blood cells (WBCs) from B-CLL patients contain 18, 22 and 24 kDa isoforms of FGF-2 whereas WBCs from CML patients contain only the 24 kDa isoform. Furthermore, as cultured B-CLL WBCs release 18 kDa FGF-2 into the medium, they constitute a potential source of FGF-2 in the blood. In a receptor binding assay, 125I-FGF-2 binds weakly to B-CLL WBCs, whereas the ligand binds more strongly to CML WBCs. Correspondingly, FGF-2 is unable to activate mitogen-activated protein kinase kinase (MEK) and its substrate, extracellular signal-regulated kinase (ERK), in B-CLL cells, whereas phosphorylation of both these cell growth-related kinases increases following treatment of CML WBCs. We conclude that B-CLL WBCs secrete FGF-2 with no apparent autocrine actions. In contrast, WBCs in CML bind FGF-2 provided by other FGF-2-hyperproducing cells and activate the MEK/ERK kinase cascade, possibly to modulate cell growth.
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Acknowledgements
We thank J Sucikova, Z Kristkova, R Slovackova and A Kozubik for their contribution to this work and E Notarianni and L Krenek for comments on manuscript. This work was supported by grant 312/97/0393 from the Grant Agency of the Czech Republic and in part by grants VS96115 and ME198 from the Ministry of Education, Youth and Sports of the Czech Republic.
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Krejčí, P., Dvořáková, D., Krahulcová, E. et al. FGF-2 abnormalities in B cell chronic lymphocytic and chronic myeloid leukemias. Leukemia 15, 228–237 (2001). https://doi.org/10.1038/sj.leu.2402012
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DOI: https://doi.org/10.1038/sj.leu.2402012
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