Flavaglines target primitive leukemia cells and enhance anti-leukemia drug activity.

Abstract:

:Identification of agents that target human leukemia stem cells is an important consideration for the development of new therapies. The present study demonstrates that rocaglamide and silvestrol, closely related natural products from the flavagline class of compounds, are able to preferentially kill functionally defined leukemia stem cells, while sparing normal stem and progenitor cells. In addition to efficacy as single agents, flavaglines sensitize leukemia cells to several anticancer compounds, including front-line chemotherapeutic drugs used to treat leukemia patients. Mechanistic studies indicate that flavaglines strongly inhibit protein synthesis, leading to the reduction of short-lived antiapoptotic proteins. Notably though, treatment with flavaglines, alone or in combination with other drugs, yields a much stronger cytotoxic activity toward leukemia cells than the translational inhibitor temsirolimus. These results indicate that the underlying cell death mechanism of flavaglines is more complex than simply inhibiting general protein translation. Global gene expression profiling and cell biological assays identified Myc inhibition and the disruption of mitochondrial integrity to be features of flavaglines, which we propose contribute to their efficacy in targeting leukemia cells. Taken together, these findings indicate that rocaglamide and silvestrol are distinct from clinically available translational inhibitors and represent promising candidates for the treatment of leukemia.

journal_name

Leukemia

journal_title

Leukemia

authors

Callahan KP,Minhajuddin M,Corbett C,Lagadinou ED,Rossi RM,Grose V,Balys MM,Pan L,Jacob S,Frontier A,Grever MR,Lucas DM,Kinghorn AD,Liesveld JL,Becker MW,Jordan CT

doi

10.1038/leu.2014.93

subject

Has Abstract

pub_date

2014-10-01 00:00:00

pages

1960-8

issue

10

eissn

0887-6924

issn

1476-5551

pii

leu201493

journal_volume

28

pub_type

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