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Blood. 2012 Jul 12;120(2):386-94. doi: 10.1182/blood-2011-12-399667. Epub 2012 May 24.

Eltrombopag inhibits the proliferation of leukemia cells via reduction of intracellular iron and induction of differentiation.

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  • 1Division of Pediatric Hematology/Oncology, Children's Hospital at Montefiore, 1300 Morris Park Ave, Bronx, NY 10461, USa.

Abstract

Eltrombopag (EP) is a small-molecule, nonpeptide thrombopoietin receptor (TPO-R) agonist that has been approved recently for the treatment of thrombocytopenia in patients with chronic immune thrombocytopenic purpura. Prior studies have shown that EP stimulates megakaryopoiesis in BM cells from patients with acute myeloid leukemia and myelodysplastic syndrome, and the results also suggested that it may inhibit leukemia cell growth. In the present study, we studied the effects of EP on leukemia cell proliferation and the mechanism of its antiproliferative effects. We found that EP leads to a decreased cell division rate, a block in G(1) phase of cell cycle, and increased differentiation in human and murine leukemia cells. Because EP is species specific in that it can only bind TPO-R in human and primate cells, these findings further suggested that the antileukemic effect is independent of TPO-R. We found that treatment with EP leads to a reduction in free intracellular iron in leukemic cells in a dose-dependent manner. Experimental increase of intracellular iron abrogated the antiproliferative and differentiation-inducing effects of EP, demonstrating that its antileukemic effects are mediated through modulation of intracellular iron content. Finally, determination of EP's antileukemic activity in vivo demonstrated its ability to prolong survival in 2 mouse models of leukemia.

PMID:
22627766
[PubMed - indexed for MEDLINE]
PMCID:
PMC3398759
Free PMC Article
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