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Potentiation of paclitaxel-induced apoptosis by the novel cyclin-dependent kinase inhibitor NU6140: A possible role for survivin down-regulation

Lookup NU author(s): Dr Allyson Campbell, Dr YuZhu Cheng, Lan Wang, Professor Nicola Curtin, Professor Bernard Golding, Professor Roger Griffin, Dr Ian Hardcastle, Andrew Henderson, Professor Herbie Newell

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Abstract

Cyclin-dependent kinases (CDK) play a crucial role in the control of the cell cycle. Aberrations in the control of cell cycle progression occur in the majority of human malignancies; hence, CDKs are promising targets for anticancer therapy. Here, we define the cellular effects of the novel CDK inhibitor NU6140, alone or in association with paclitaxel, with respect to inhibition of cell proliferation and cell cycle progression and induction of apoptosis in HeLa cervical carcinoma cells and in comparison with purvalanol A. Both CDK inhibitors induced a concentration-dependent cell cycle arrest at the G2-M phase and an increase in the apoptotic rate, with a concomitant down-regulation of the antiapoptotic protein survivin, a member of the inhibitors of apoptosis protein family. Notably, the addition of NU6140 to paclitaxel-treated cells resulted in markedly increased cytotoxic effect and apoptotic response in comparison with the paclitaxel-purvalanol A combination (86 ± 11 % and 37 ± 8%, respectively). Similarly, the extent of caspase-9 and caspase-3 activation in paclitaxel-NU6140-treated cells was ∼4-fold higher than after the paclitaxel-purvalanol A combination. Moreover, an almost complete abrogation of the expression of the active, Thr34-phosphorylated form of survivin was observed in cells exposed to the paclitaxel-NU6140 combination. A synergistic effect of the paclitaxel-NU6140 combination, as a consequence of survivin inhibition and increased activation of caspase-9 and caspase-3, was also observed in OAW42/e ovarian cancer line but not in the derived OAW42/Surv subline ectopically expressing survivin. Results from this study indicate that NU6140 significantly potentiates the apoptotic effect of paclitaxel, with inhibition of survivin expression/phosphorylation as the potential mechanism. Copyright © 2005 American Association for Cancer Research.


Publication metadata

Author(s): Pennati M, Campbell AJ, Curto M, Binda M, Cheng Y, Wang L, Curtin NJ, Golding BT, Griffin RJ, Hardcastle IR, Henderson A, Zaffaroni N, Newell DR

Publication type: Article

Publication status: Published

Journal: Molecular Cancer Therapeutics

Year: 2005

Volume: 4

Issue: 9

Pages: 1328-1337

Print publication date: 01/09/2005

ISSN (print): 1535-7163

ISSN (electronic): 1538-8514

URL: http://dx.doi.org/10.1158/1535-7163.MCT-05-0022

DOI: 10.1158/1535-7163.MCT-05-0022

PubMed id: 16170024


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