title: Brain-derived neurotrophic factor is a potential osteoclast stimulating factor in multiple myeloma.
abstract: Multiple myeloma (MM) is characterized by accumulation of monoclonal plasma cells in the bone marrow and progression of lytic bone lesions. The mechanisms of enhanced bone resorption in patients with myeloma are not fully defined. We have previously identified the role of brain-derived neurotrophic factor (BDNF) in proliferation and migration of MM cells. In our study, we investigated whether BDNF was possibly involved in MM cell-induced osteolysis. We showed that BDNF was elevated in MM patients and the bone marrow plasma levels of BDNF positively correlated with extent of bone disease. In osteoclast formation assay, bone marrow plasma from patients with MM increased osteoclast formation and the effect was significantly blocked by neutralizing antibody to BDNF, suggesting a critical role for BDNF in osteoclast activation. Furthermore, the direct effects of recombinant BDNF on osteoclast formation and bone resorption support the potential role of BDNF in the MM bone disease. BDNF receptor TrkB was expressed by human osteoclast precursors and a Trk inhibitor K252a markedly inhibited osteoclast formation stimulated with BDNF, demonstrating that BDNF used TrkB for its effects on osteoclast. Finally, bone marrow plasma BDNF level positively correlated with macrophage inflammatory protein-1α and receptor activator of nuclear factor-κB ligand, two major osteoclast stimulatory factors in MM. These results support an important role for BDNF in the development of myeloma bone disease.
authors.affiliation: Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Dadao, Wuhan 430022, People's Republic of China.
authors.forename: Chun-Yan
authors.initials: CY
authors.lastname: Sun
authors.forename: Zhang-Bo
authors.initials: ZB
authors.lastname: Chu
authors.forename: Xiao-Mei
authors.initials: XM
authors.lastname: She
authors.forename: Lu
authors.initials: L
authors.lastname: Zhang
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
authors.forename: Li-Sha
authors.initials: LS
authors.lastname: Ai
authors.forename: Yu
authors.initials: Y
authors.lastname: Hu
mesh_terms: D000328:Adult; D000368:Aged; D001862:Bone Resorption / Q000209:etiology*; D019208:Brain-Derived Neurotrophic Factor / Q000032:analysis / Q000502:physiology*; D005260:Female; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D008297:Male; D008875:Middle Aged; D009101:Multiple Myeloma / Q000150:complications*; D010010:Osteoclasts / Q000502:physiology; D010455:Peptides / Q000502:physiology*; D020813:Receptor, trkB / Q000502:physiology
chemical_list: D019208:Brain-Derived Neurotrophic Factor; D047908:Intracellular Signaling Peptides and Proteins; D010455:Peptides; C408994:osteoclast stimulating factor; D020813:Receptor, trkB