Targeting the Nuclear Import Receptor Kpnβ1 as an Anticancer Therapeutic.

Abstract:

:Karyopherin beta 1 (Kpnβ1) is a nuclear transport receptor that imports cargoes into the nucleus. Recently, elevated Kpnβ1 expression was found in certain cancers and Kpnβ1 silencing with siRNA was shown to induce cancer cell death. This study aimed to identify novel small molecule inhibitors of Kpnβ1, and determine their anticancer activity. An in silico screen identified molecules that potentially bind Kpnβ1 and Inhibitor of Nuclear Import-43, INI-43 (3-(1H-benzimidazol-2-yl)-1-(3-dimethylaminopropyl)pyrrolo[5,4-b]quinoxalin-2-amine) was investigated further as it interfered with the nuclear localization of Kpnβ1 and known Kpnβ1 cargoes NFAT, NFκB, AP-1, and NFY and inhibited the proliferation of cancer cells of different tissue origins. Minimum effect on the proliferation of noncancer cells was observed at the concentration of INI-43 that showed a significant cytotoxic effect on various cervical and esophageal cancer cell lines. A rescue experiment confirmed that INI-43 exerted its cell killing effects, in part, by targeting Kpnβ1. INI-43 treatment elicited a G2-M cell-cycle arrest in cancer cells and induced the intrinsic apoptotic pathway. Intraperitoneal administration of INI-43 significantly inhibited the growth of subcutaneously xenografted esophageal and cervical tumor cells. We propose that Kpnβ1 inhibitors could have therapeutic potential for the treatment of cancer. Mol Cancer Ther; 15(4); 560-73. ©2016 AACR.

journal_name

Mol Cancer Ther

authors

van der Watt PJ,Chi A,Stelma T,Stowell C,Strydom E,Carden S,Angus L,Hadley K,Lang D,Wei W,Birrer MJ,Trent JO,Leaner VD

doi

10.1158/1535-7163.MCT-15-0052

subject

Has Abstract

pub_date

2016-04-01 00:00:00

pages

560-73

issue

4

eissn

1535-7163

issn

1538-8514

pii

1535-7163.MCT-15-0052

journal_volume

15

pub_type

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