Genetic deletion of Sost or pharmacological inhibition of sclerostin prevent multiple myeloma-induced bone disease without affecting tumor growth

J. Delgado-Calle, J. Anderson, M. D. Cregor, K. W. Condon, S. A. Kuhstoss, L. I. Plotkin, T. Bellido, G. D. Roodman

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

Multiple myeloma (MM) causes lytic bone lesions due to increased bone resorption and concomitant marked suppression of bone formation. Sclerostin (Scl), an osteocyte-derived inhibitor of Wnt/β-catenin signaling, is elevated in MM patient sera and increased in osteocytes in MM-bearing mice. We show here that genetic deletion of Sost, the gene encoding Scl, prevented MM-induced bone disease in an immune-deficient mouse model of early MM, and that administration of anti-Scl antibody (Scl-Ab) increased bone mass and decreases osteolysis in immune-competent mice with established MM. Sost/Scl inhibition increased osteoblast numbers, stimulated new bone formation and decreased osteoclast number in MM-colonized bone. Further, Sost/Scl inhibition did not affect tumor growth in vivo or anti-myeloma drug efficacy in vitro. These results identify the osteocyte as a major contributor to the deleterious effects of MM in bone and osteocyte-derived Scl as a promising target for the treatment of established MM-induced bone disease. Further, Scl did not interfere with efficacy of chemotherapy for MM, suggesting that combined treatment with antimyeloma drugs and Scl-Ab should effectively control MM growth and bone disease, providing new avenues to effectively control MM and bone disease in patients with active MM.

Original languageEnglish (US)
Pages (from-to)2686-2694
Number of pages9
JournalLeukemia
Volume31
Issue number12
DOIs
StatePublished - Jan 1 2017

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ASJC Scopus subject areas

  • Hematology
  • Oncology
  • Cancer Research

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