Abstract
This study investigated the signaling pathways involved in the different biological effects of brain-derived neurotrophic factor (BDNF) in multiple myeloma (MM). The effects of BDNF on proliferation of MM cell lines and primary myeloma cells were examined by [3H]thymidine incorporation assay. The effects of BDNF on MM cells migration were studied by transwell migration assay. Stimulation by BDNF of vascular endothelial growth factor (VEGF) production was analyzed by reverse transcriptase-polymerase chain reaction and enzyme-linked immunosorbent assay. The signal-transduction pathways that are activated in response to BDNF were determined by Western blots. VEGF is induced by BDNF in a dose-dependent manner in MM cells. Stimulation of MM cells with BDNF led to the activation of the phosphatidylinositol 3-kinase (PI3K)/Akt and the MEK-extracellular signal-regulated protein kinase pathways. Using specific signal-transduction inhibitors, we demonstrated that MEK is required for BDNF-induced proliferation, whereas activation of PI3K is required for BDNF-stimulated migration and VEGF production. BDNF affects different cell signaling pathways mediating growth, migration, and VEGF secretion in MM cells. Our observations provided the framework for novel therapeutic strategies targeting BDNF signaling cascades in MM.
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Acknowledgments
We thank Prof. Tang-chun Wu (Institute of Occupational Medicine, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China) for offering relevant experimental facilities and technical support.
Funding
This work was supported by National Natural Sciences Foundation of People's Republic of China (No. 30670896, for Y.H.; No. 30700331, for C.Y.S.).
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Sun, Cy., Hu, Y., Huang, J. et al. Brain-derived neurotrophic factor induces proliferation, migration, and VEGF secretion in human multiple myeloma cells via activation of MEK-ERK and PI3K/AKT signaling. Tumor Biol. 31, 121–128 (2010). https://doi.org/10.1007/s13277-010-0016-x
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DOI: https://doi.org/10.1007/s13277-010-0016-x