Glycosphingolipid synthesis inhibition limits osteoclast activation and myeloma bone disease

Ersek, Adel, Xu, Ke, Antonopoulos, Aristotelis, Butters, Terry D, Santo, Ana Espirito, Vattakuzhi, Youridies, Williams, Lynn M, Goudevenou, Katerina, Danks, Lynett, Freidin, Andrew, Spanoudakis, Emmanouil, Parry, Simon, Papaioannou, Maria, Hatjiharissi, Evdoxia, Chaidos, Aristeidis, Alonzi, Dominic S, Twigg, Gabriele, Hu, Ming, Dwek, Raymond A, Haslam, Stuart M, Roberts, Irene, Dell, Anne, Rahemtulla, Amin, Horwood, Nicole J ORCID: and Karadimitris, Anastasios (2015) Glycosphingolipid synthesis inhibition limits osteoclast activation and myeloma bone disease. Journal of Clinical Investigation, 125 (6). pp. 2279-2292. ISSN 0021-9738

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Glycosphingolipids (GSLs) are essential constituents of cell membranes and lipid rafts and can modulate signal transduction events. The contribution of GSLs in osteoclast (OC) activation and osteolytic bone diseases in malignancies such as the plasma cell dyscrasia multiple myeloma (MM) is not known. Here, we tested the hypothesis that pathological activation of OCs in MM requires de novo GSL synthesis and is further enhanced by myeloma cell-derived GSLs. Glucosylceramide synthase (GCS) inhibitors, including the clinically approved agent N-butyl-deoxynojirimycin (NB-DNJ), prevented OC development and activation by disrupting RANKL-induced localization of TRAF6 and c-SRC into lipid rafts and preventing nuclear accumulation of transcriptional activator NFATc1. GM3 was the prevailing GSL produced by patient-derived myeloma cells and MM cell lines, and exogenous addition of GM3 synergistically enhanced the ability of the pro-osteoclastogenic factors RANKL and insulin-like growth factor 1 (IGF-1) to induce osteoclastogenesis in precursors. In WT mice, administration of GM3 increased OC numbers and activity, an effect that was reversed by treatment with NB-DNJ. In a murine MM model, treatment with NB-DNJ markedly improved osteolytic bone disease symptoms. Together, these data demonstrate that both tumor-derived and de novo synthesized GSLs influence osteoclastogenesis and suggest that NB-DNJ may reduce pathological OC activation and bone destruction associated with MM.

Item Type: Article
Uncontrolled Keywords: analogs & derivatives,animals,cell line,female,antagonists & inhibitors,pharmacology,biosynthesis,genetics,genetics,mice,mice, knockout,genetics,metabolism,genetics,genetics,genetics,genetics
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
UEA Research Groups: Faculty of Medicine and Health Sciences > Research Centres > Metabolic Health
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Depositing User: LivePure Connector
Date Deposited: 06 Mar 2019 12:30
Last Modified: 19 Oct 2023 02:23
DOI: 10.1172/JCI59987

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