Glycosphingolipid synthesis inhibition limits osteoclast activation and myeloma bone disease

Adel Ersek, Ke Xu, Aristotelis Antonopoulos, Terry D Butters, Ana Espirito Santo, Youridies Vattakuzhi, Lynn M Williams, Katerina Goudevenou, Lynett Danks, Andrew Freidin, Emmanouil Spanoudakis, Simon Parry, Maria Papaioannou, Evdoxia Hatjiharissi, Aristeidis Chaidos, Dominic S Alonzi, Gabriele Twigg, Ming Hu, Raymond A Dwek, Stuart M HaslamIrene Roberts, Anne Dell, Amin Rahemtulla, Nicole J Horwood, Anastasios Karadimitris

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2279-2292
Number of pages14
JournalJournal of Clinical Investigation
Volume125
Issue number6
Early online date27 Apr 2015
DOIs
Publication statusPublished - 1 Jun 2015

Keywords

  • 1-Deoxynojirimycin/analogs & derivatives
  • Animals
  • Cell Line
  • Female
  • Glucosyltransferases/antagonists & inhibitors
  • Glycoside Hydrolase Inhibitors/pharmacology
  • Glycosphingolipids/biosynthesis
  • Insulin-Like Growth Factor I/genetics
  • Membrane Microdomains/genetics
  • Mice
  • Mice, Knockout
  • Multiple Myeloma/genetics
  • Osteoclasts/metabolism
  • Osteolysis/genetics
  • RANK Ligand/genetics
  • TNF Receptor-Associated Factor 6/genetics
  • src-Family Kinases/genetics

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