Preclinical activity of a novel CRM1 inhibitor in acute myeloid leukemia.

Abstract:

:Chromosome maintenance protein 1 (CRM1) is a nuclear export receptor involved in the active transport of tumor suppressors (e.g., p53 and nucleophosmin) whose function is altered in cancer because of increased expression and overactive transport. Blocking CRM1-mediated nuclear export of such proteins is a novel therapeutic strategy to restore tumor suppressor function. Orally bioavailable selective inhibitors of nuclear export (SINE) that irreversibly bind to CRM1 and block the function of this protein have been recently developed. Here we investigated the antileukemic activity of KPT-SINE (KPT-185 and KPT-276) in vitro and in vivo in acute myeloid leukemia (AML). KPT-185 displayed potent antiproliferative properties at submicromolar concentrations (IC50 values; 100-500 nM), induced apoptosis (average 5-fold increase), cell-cycle arrest, and myeloid differentiation in AML cell lines and patient blasts. A strong down-regulation of the oncogene FLT3 after KPT treatment in both FLT3-ITD and wild-type cell lines was observed. Finally, using the FLT3-ITD-positive MV4-11 xenograft murine model, we show that treatment of mice with oral KPT-276 (analog of KPT-185 for in vivo studies) significantly prolongs survival of leukemic mice (P < .01). In summary, KPT-SINE are highly potent in vitro and in vivo in AML. The preclinical results reported here support clinical trials of KPT-SINE in AML.

journal_name

Blood

journal_title

Blood

authors

Ranganathan P,Yu X,Na C,Santhanam R,Shacham S,Kauffman M,Walker A,Klisovic R,Blum W,Caligiuri M,Croce CM,Marcucci G,Garzon R

doi

10.1182/blood-2012-04-423160

subject

Has Abstract

pub_date

2012-08-30 00:00:00

pages

1765-73

issue

9

eissn

0006-4971

issn

1528-0020

pii

blood-2012-04-423160

journal_volume

120

pub_type

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