CBCRA
Canadian Breast Cancer Research Alliance
ACRCS
Alliance canadienne pour la recherche sur le cancer du sein
:
Search:
Advanced Search

Inhibition of the G2 DNA damage checkpoint and of protein kinases Chk1 and Chk2 by the marine sponge alkaloid debromohymenialdisine

Show full item record

Title: Inhibition of the G2 DNA damage checkpoint and of protein kinases Chk1 and Chk2 by the marine sponge alkaloid debromohymenialdisine
Author: Curman, D.; Cinel, B.; Williams, D. E.; Rundle, N.; Block, W. D.; Goodarzi, A. A.; Hutchins, J. R.; Clarke, P. R.; Zhou, B. B.; Lees-Miller, S. P.; Andersen, R. J.; Roberge, M.
Abstract: Cells can respond to DNA damage by activating checkpoints that delay cell cycle progression and allow time for DNA repair. Chemical inhibitors of the G(2) phase DNA damage checkpoint may be used as tools to understand better how the checkpoint is regulated and may be used to sensitize cancer cells to DNA-damaging therapies. However, few inhibitors are known. We used a cell-based assay to screen natural extracts for G(2) checkpoint inhibitors and identified debromohymenialdisine (DBH) from a marine sponge. DBH is distinct structurally from previously known G(2) checkpoint inhibitors. It inhibited the G(2) checkpoint with an IC(50) of 8 micrometer and showed moderate cytotoxicity (IC(50) = 25 micrometer) toward MCF-7 cells. DBH inhibited the checkpoint kinases Chk1 (IC(50) = 3 micrometer) and Chk2 (IC(50) = 3.5 micrometer) but not ataxia-telangiectasia mutated (ATM), ATM-Rad3-related protein, or DNA-dependent protein kinase in vitro, indicating that it blocks two major branches of the checkpoint pathway downstream of ATM. It did not cause the activation or inhibition of different signal transduction proteins, as determined by mobility shift analysis in Western blots, suggesting that it inhibits a narrow range of protein kinases in vivo.
Description: This article is hosted on a website external to the CBCRA Open Access Archive. Selecting “View/Open” below will launch the full-text article in another browser window.
Publisher: American Society for Biochemistry and Molecular Biology
URI: http://hdl.handle.net/1807.1/62
Date: 2001-05

Files in this item

Files Size Description Format View
Curman.2001.17914.html 415bytes External link HTML View/Open

This item appears in the following category

Show full item record

Browse

Tools