The small-molecule VEGF receptor inhibitor pazopanib (GW786034B) targets both tumor and endothelial cells in multiple myeloma

Klaus Podar, Giovanni Tonon, Martin Sattler, Yu Tsu Tai, Steven LeGouill, Hiroshi Yasui, Kenji Ishitsuka, Shaji Kumar, Rakesh Kumar, Lini N. Pandite, Teru Hideshima, Dharminder Chauhan, Kenneth C. Anderson

Research output: Contribution to journalArticle

Abstract

A critical role for vascular endothelial factor (VEGF) has been demonstrated in multiple myeloma (MM) pathogenesis. Here, we characterized the effect of the small-molecule VEGF receptor inhibitor pazopanib on MM cells in the bone marrow milieu. Pazopanib inhibits VEGF-triggered signaling pathways in both tumor and endothelial cells, thereby blocking in vitro MM cell growth, survival, and migration, and inhibits VEGF-induced up-regulation of adhesion molecules on both endothelial and tumor cells, thereby abrogating endothelial cell-MM cell binding and associated cell proliferation. We show that pazopanib is the first-in-class VEGF receptor inhibitor to inhibit in vivo tumor cell growth associated with increased MM cell apoptosis, decreased angiogenesis, and prolonged survival in a mouse xenograft model of human MM. Low-dose pazopanib demonstrates synergistic cytotoxicity with conventional (melphalan) and novel (bortezomib and immunomodulatory drugs) therapies. Finally, gene expression and signaling network analysis show transcriptional changes of several cancer-related genes, in particular c-Myc. Using siRNA, we confirm the role of c-Myc in VEGF production and secretion, as well as angiogenasis. These preclinical studies provide the rationale for clinical evaluation of pazopanib, alone and in combination with conventional and novel therapies, to increase efficacy, overcome drug resistance, reduce toxicity, and improve patient outcome in MM.

Original languageEnglish
Pages (from-to)19478-19483
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume103
Issue number51
DOIs
Publication statusPublished - Dec 19 2006

Keywords

  • Angiogenesis
  • Xenograft mouse model

ASJC Scopus subject areas

  • Genetics
  • General

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    Podar, K., Tonon, G., Sattler, M., Tai, Y. T., LeGouill, S., Yasui, H., Ishitsuka, K., Kumar, S., Kumar, R., Pandite, L. N., Hideshima, T., Chauhan, D., & Anderson, K. C. (2006). The small-molecule VEGF receptor inhibitor pazopanib (GW786034B) targets both tumor and endothelial cells in multiple myeloma. Proceedings of the National Academy of Sciences of the United States of America, 103(51), 19478-19483. https://doi.org/10.1073/pnas.0609329103