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Blood, 1 May 2004, Vol. 103, No. 9, pp. 3474-3479.
Prepublished online as a Blood First Edition Paper on November 26, 2003; DOI 10.1182/blood-2003-10-3527.
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NEOPLASIA
GW654652, the pan-inhibitor of VEGF receptors, blocks the growth and migration of multiple myeloma cells in the bone marrow microenvironment
Klaus Podar,
Laurence P. Catley,
Yu-Tzu Tai,
Reshma Shringarpure,
Pedro Carvalho,
Toshiaki Hayashi,
Renate Burger,
Robert L. Schlossman,
Paul G. Richardson,
Lini N. Pandite,
Rakesh Kumar,
Teru Hideshima,
Dharminder Chauhan, and
Kenneth C. Anderson
From the Department of Medical Oncology, Jerome Lipper Multiple Myeloma Center, and the Department of Pediatric Hematology and Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA; and GlaxoSmithKline, Research Triangle Park, NC.
Previous studies have shown that the multiple myeloma (MM) cell line and MM patient cells express high-affinity vascular endothelial growth factor (VEGF) receptor-1 or Fms-like tyrosine kinase-1 (Flt-1) but not VEGF receptor-2 or Flk-1/kinase insert domain-containing receptor (Flk-1/KDR) and that VEGF triggers MM cell proliferation through a mitogen-activated protein kinase (MAPK)-dependent pathway and migration through a protein kinase C (PKC)-dependent pathway. The present study evaluates the efficacy of the small molecule tyrosine-kinase inhibitor GW654652, which inhibits all 3 VEGF receptors with similar potency. We show that GW654652 acts directly on MM cells and in the bone marrow microenvironment. Specifically, GW654652 (1-10 µg/mL) inhibits, in a dose-dependent fashion, VEGF-triggered migrational activity and cell proliferation of MM cell lines that are sensitive and resistant to conventional therapy. As expected from our previous studies of VEGF-induced signaling and sequelae in MM cells, GW654652 blocked VEGF-induced Flt-1 phosphorylation and downstream activation of AKT-1 and MAPK-signaling cascades. Importantly, GW654652 also inhibits interleukin-6 and VEGF secretion and proliferation of MM cells induced by tumor cell binding to bone marrow (BM) stromal cells. The activity of a pan-VEGF receptor inhibitor against MM cells in the BM milieu, coupled with its lack of major toxicity in preclinical mouse models, provides the framework for clinical trials of this drug class to improve patient outcome in MM. (Blood. 2004;103:3474-3479)
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