Azaspirane (N-N-diethyl-8,8-dipropyl-2-azaspiro [4.5] decane-2-propanamine) inhibits human multiple myeloma cell growth in the bone marrow milieu in vitro and in vivo

Makoto Hamasaki, Teru Hideshima, Pierfrancesco Tassone, Paola Neri, Kenji Ishitsuka, Hiroshi Yasui, Norihiko Shiraishi, Noopur Raje, Shaji Kumar, Donald H. Picker, Gary S. Jacob, Paul G. Richardson, Nikhil C. Munshi, Kenneth C. Anderson

Research output: Contribution to journalArticle

52 Scopus citations

Abstract

Azaspirane (N-N-diethyl-8,8-dipropyl-2-azaspiro [4.5] decane-2-propanamine; trade name, Atiprimod) is an orally bioavailable cationic amphiphilic compound that significantly inhibits production of interleukin 6 (IL-6) and inflammation in rat arthritis and autoimmune animal models. We here characterize the effect of atiprimod on human multiple myeloma (MM) cells. Azaspirane significantly inhibited growth and induced caspase-mediated apoptosis in drug-sensitive and drug-resistant MM cell lines, as well as patient MM cells. IL-6, insulin-like growth factor 1 (IGF-1), or adherence of MM cells to bone marrow stromal cells (BMSCs) did not protect against atiprimod-induced apoptosis. Both conventional (dexamethasone, doxorubicin, melphalan) and novel (arsenic trioxide) agents augment apoptosis induced by atiprimod. Azaspirane inhibits signal transducer activator of transcription 3 (STAT3) and a PI3-K (phosphatidyl-inositol 3-kinase) target (Akt), but not extracellular signal-regulated kinase 1 and 2 (ERKV2), inhibits phosphorylation triggered by IL-6, and also inhibits inhibitorKBa (IκBα) and nuclear factor κB(NFκB) p65 phosphorylation triggered by tumor necrosis factor α (TNF-α). Of importance, azaspirane inhibits both IL-6 and vascular endothelial growth factor (VEGF) secretion in BMSCs triggered by MM cell binding and also inhibits angiogenesis on human umbilical vein cells (HUVECs). Finally, azaspirane demonstrates in vivo antitumor activity against human MM cell growth in severe combined immunodeficient (SCID) mice. These results, therefore, show that azaspirane both induces MM cell apoptosis and inhibits cytokine secretion in the BM milieu, providing the framework for clinical trials to improve patient outcome in MM.

Original languageEnglish (US)
Pages (from-to)4470-4476
Number of pages7
JournalBlood
Volume105
Issue number11
DOIs
StatePublished - Jun 1 2005

ASJC Scopus subject areas

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology

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