CDK5 Regulates Paclitaxel Sensitivity in Ovarian Cancer Cells by Modulating AKT Activation, p21Cip1- and p27Kip1-Mediated G1 Cell Cycle Arrest and Apoptosis.

Cyclin-dependent kinase 5 (CDK5) is a cytoplasmic serine/ threonine kinase. Knockdown of CDK5 enhances paclitaxel sensitivity in human ovarian cancer cells. This study explores the mechanisms by which CDK5 regulates paclitaxel sensitivity in human ovarian cancers. Multiple ovarian cancer cell lines...

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Main Authors: Shu Zhang, Zhen Lu, Weiqun Mao, Ahmed A Ahmed, Hailing Yang, Jinhua Zhou, Nicholas Jennings, Cristian Rodriguez-Aguayo, Gabriel Lopez-Berestein, Roberto Miranda, Wei Qiao, Veera Baladandayuthapani, Zongfang Li, Anil K Sood, Jinsong Liu, Xiao-Feng Le, Robert C Bast
Format: Article
Language:English
Published: Public Library of Science (PLoS) 2015-01-01
Series:PLoS ONE
Online Access:https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0131833&type=printable
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author Shu Zhang
Zhen Lu
Weiqun Mao
Ahmed A Ahmed
Hailing Yang
Jinhua Zhou
Nicholas Jennings
Cristian Rodriguez-Aguayo
Gabriel Lopez-Berestein
Roberto Miranda
Wei Qiao
Veera Baladandayuthapani
Zongfang Li
Anil K Sood
Jinsong Liu
Xiao-Feng Le
Robert C Bast
author_facet Shu Zhang
Zhen Lu
Weiqun Mao
Ahmed A Ahmed
Hailing Yang
Jinhua Zhou
Nicholas Jennings
Cristian Rodriguez-Aguayo
Gabriel Lopez-Berestein
Roberto Miranda
Wei Qiao
Veera Baladandayuthapani
Zongfang Li
Anil K Sood
Jinsong Liu
Xiao-Feng Le
Robert C Bast
author_sort Shu Zhang
collection DOAJ
description Cyclin-dependent kinase 5 (CDK5) is a cytoplasmic serine/ threonine kinase. Knockdown of CDK5 enhances paclitaxel sensitivity in human ovarian cancer cells. This study explores the mechanisms by which CDK5 regulates paclitaxel sensitivity in human ovarian cancers. Multiple ovarian cancer cell lines and xenografts were treated with CDK5 small interfering RNA (siRNA) with or without paclitaxel to examine the effect on cancer cell viability, cell cycle arrest and tumor growth. CDK5 protein was measured by immunohistochemical staining of an ovarian cancer tissue microarray to correlate CDK5 expression with overall patient survival. Knockdown of CDK5 with siRNAs inhibits activation of AKT which significantly correlates with decreased cell growth and enhanced paclitaxel sensitivity in ovarian cancer cell lines. In addition, CDK5 knockdown alone and in combination with paclitaxel induced G1 cell cycle arrest and caspase 3 dependent apoptotic cell death associated with post-translational upregulation and nuclear translocation of TP53 and p27(Kip1) as well as TP53-dependent transcriptional induction of p21(Cip1) in wild type TP53 cancer cells. Treatment of HEYA8 and A2780 wild type TP53 xenografts in nu/nu mice with CDK5 siRNA and paclitaxel produced significantly greater growth inhibition than either treatment alone. Increased expression of CDK5 in human ovarian cancers correlates inversely with overall survival. CDK5 modulates paclitaxel sensitivity by regulating AKT activation, the cell cycle and caspase-dependent apoptosis. CDK5 inhibition can potentiate paclitaxel activity in human ovarian cancer cells.
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publisher Public Library of Science (PLoS)
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spelling doaj-art-cbbd8a5e117f459093a006bc7bf4fb972025-08-20T03:10:05ZengPublic Library of Science (PLoS)PLoS ONE1932-62032015-01-01107e013183310.1371/journal.pone.0131833CDK5 Regulates Paclitaxel Sensitivity in Ovarian Cancer Cells by Modulating AKT Activation, p21Cip1- and p27Kip1-Mediated G1 Cell Cycle Arrest and Apoptosis.Shu ZhangZhen LuWeiqun MaoAhmed A AhmedHailing YangJinhua ZhouNicholas JenningsCristian Rodriguez-AguayoGabriel Lopez-BeresteinRoberto MirandaWei QiaoVeera BaladandayuthapaniZongfang LiAnil K SoodJinsong LiuXiao-Feng LeRobert C BastCyclin-dependent kinase 5 (CDK5) is a cytoplasmic serine/ threonine kinase. Knockdown of CDK5 enhances paclitaxel sensitivity in human ovarian cancer cells. This study explores the mechanisms by which CDK5 regulates paclitaxel sensitivity in human ovarian cancers. Multiple ovarian cancer cell lines and xenografts were treated with CDK5 small interfering RNA (siRNA) with or without paclitaxel to examine the effect on cancer cell viability, cell cycle arrest and tumor growth. CDK5 protein was measured by immunohistochemical staining of an ovarian cancer tissue microarray to correlate CDK5 expression with overall patient survival. Knockdown of CDK5 with siRNAs inhibits activation of AKT which significantly correlates with decreased cell growth and enhanced paclitaxel sensitivity in ovarian cancer cell lines. In addition, CDK5 knockdown alone and in combination with paclitaxel induced G1 cell cycle arrest and caspase 3 dependent apoptotic cell death associated with post-translational upregulation and nuclear translocation of TP53 and p27(Kip1) as well as TP53-dependent transcriptional induction of p21(Cip1) in wild type TP53 cancer cells. Treatment of HEYA8 and A2780 wild type TP53 xenografts in nu/nu mice with CDK5 siRNA and paclitaxel produced significantly greater growth inhibition than either treatment alone. Increased expression of CDK5 in human ovarian cancers correlates inversely with overall survival. CDK5 modulates paclitaxel sensitivity by regulating AKT activation, the cell cycle and caspase-dependent apoptosis. CDK5 inhibition can potentiate paclitaxel activity in human ovarian cancer cells.https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0131833&type=printable
spellingShingle Shu Zhang
Zhen Lu
Weiqun Mao
Ahmed A Ahmed
Hailing Yang
Jinhua Zhou
Nicholas Jennings
Cristian Rodriguez-Aguayo
Gabriel Lopez-Berestein
Roberto Miranda
Wei Qiao
Veera Baladandayuthapani
Zongfang Li
Anil K Sood
Jinsong Liu
Xiao-Feng Le
Robert C Bast
CDK5 Regulates Paclitaxel Sensitivity in Ovarian Cancer Cells by Modulating AKT Activation, p21Cip1- and p27Kip1-Mediated G1 Cell Cycle Arrest and Apoptosis.
PLoS ONE
title CDK5 Regulates Paclitaxel Sensitivity in Ovarian Cancer Cells by Modulating AKT Activation, p21Cip1- and p27Kip1-Mediated G1 Cell Cycle Arrest and Apoptosis.
title_full CDK5 Regulates Paclitaxel Sensitivity in Ovarian Cancer Cells by Modulating AKT Activation, p21Cip1- and p27Kip1-Mediated G1 Cell Cycle Arrest and Apoptosis.
title_fullStr CDK5 Regulates Paclitaxel Sensitivity in Ovarian Cancer Cells by Modulating AKT Activation, p21Cip1- and p27Kip1-Mediated G1 Cell Cycle Arrest and Apoptosis.
title_full_unstemmed CDK5 Regulates Paclitaxel Sensitivity in Ovarian Cancer Cells by Modulating AKT Activation, p21Cip1- and p27Kip1-Mediated G1 Cell Cycle Arrest and Apoptosis.
title_short CDK5 Regulates Paclitaxel Sensitivity in Ovarian Cancer Cells by Modulating AKT Activation, p21Cip1- and p27Kip1-Mediated G1 Cell Cycle Arrest and Apoptosis.
title_sort cdk5 regulates paclitaxel sensitivity in ovarian cancer cells by modulating akt activation p21cip1 and p27kip1 mediated g1 cell cycle arrest and apoptosis
url https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0131833&type=printable
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