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Blood, 1 May 2007, Vol. 109, No. 9, pp. 3915-3921.
Prepublished online as a Blood First Edition Paper on January 9, 2007; DOI 10.1182/blood-2006-07-037671.
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NEOPLASIA
Targeting aurora kinases as therapy in multiple myeloma
Yijiang Shi1,
Tony Reiman3,
Weiqun Li2,
Christopher A. Maxwell3,
Subrata Sen4,
Linda Pilarski3,
Tracy R. Daniels1,
Manuel L. Penichet1,
Rick Feldman5, and
Alan Lichtenstein1
1 Division of Hematology, Veterans Administration (VA) West Los Angeles (LA)University of California Los Angeles (UCLA) Medical School and Jonsson Cancer Center, Department of Surgery, UCLA Medical School;
2 Origene Technologies, Rockville, MD;
3 Department of Oncology, University of Alberta and Cross Cancer Institute, Alberta, Canada;
4 Department of Molecular Pathology, M. D. Anderson Cancer Center, Houston, TX, and Department of Cancer Research;
5 Berlex Biosciences, Richmond, CA
The aurora kinases facilitate transit from G2 through cytokinesis and, thus, are targets in cancer therapy. Multiple myeloma (MM) is a malignancy characterized by genetic instability, suggesting a disruption of checkpoints that arrest cells at G2M when injury to the mitotic machinery occurs. Since deficient checkpoints would prevent cell cycle arrest and may render cells susceptible to apoptosis in mitosis and since aurora kinases are intermediaries in checkpoint pathways, we tested antimyeloma effects of 2 agents that inhibit aurora kinases. Both inhibited growth of MM lines and primary myeloma samples at nanomolar concentrations while having less of an effect on proliferating lymphocytes and hematopoietic cells. MM cells were not protected by IL-6 or activating mutations of Ras. Antimyeloma effects included induction of tetraploidy followed by apoptosis. Apoptosis correlated with inhibition of aurora activity as shown by reduction of histone 3B phosphorylation. Ectopic expression of aurora A protected MM cells against aurora inhibitors but had no effect on apoptosis induced by bortezomib. As expression of RHAMM in MM contributes to genetic instability, we tested effects of RHAMM. RHAMM overexpression enhanced sensitivity to apoptosis and RHAMM silencing decreased sensitivity. These results suggest potential for aurora kinase inhibitors in MM especially in patients in whom RHAMM is overexpressed.

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