Arsenic trioxide-induced growth arrest of human hepatocellular carcinoma cells involving FOXO3a expression and localization

Human hepatocellular carcinoma (HCC) remains incurable with current therapies, and novel biologically based therapies are urgently needed. Arsenic agents have long been used as anticancer agents in traditional Chinese medicine. In this study, to evaluate the effect of As 2 O 3 on HCC cells, we inves...

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Veröffentlicht in:Medical oncology (Northwood, London, England) London, England), 2009-06, Vol.26 (2), p.178-185
Hauptverfasser: Fei, Min, Lu, Mudan, Wang, You, Zhao, Yueming, He, Song, Gao, Shangfeng, Ke, Qing, Liu, Yonghua, Li, Peng, Cui, Xiaopeng, Shen, Aiguo, Cheng, Chun
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container_start_page 178
container_title Medical oncology (Northwood, London, England)
container_volume 26
creator Fei, Min
Lu, Mudan
Wang, You
Zhao, Yueming
He, Song
Gao, Shangfeng
Ke, Qing
Liu, Yonghua
Li, Peng
Cui, Xiaopeng
Shen, Aiguo
Cheng, Chun
description Human hepatocellular carcinoma (HCC) remains incurable with current therapies, and novel biologically based therapies are urgently needed. Arsenic agents have long been used as anticancer agents in traditional Chinese medicine. In this study, to evaluate the effect of As 2 O 3 on HCC cells, we investigate cell growth inhibition, cell cycle arrest, and the molecular mechanism after As 2 O 3 treatment in human HCC cells in vitro. We detected the proliferation of HCC cells by the Cell Counting Kit and FACS/Calibur Flow Cytometer and analyzed the expression and localization of FOXO3a by Western blotting Analysis and Cell Fractionation. Furthermore, we study the Akt activation after As 2 O 3 treatment and the HCC cells proliferation after combination of As 2 O 3 with PI3K inhibitor Wortmannin. As 2 O 3 significantly inhibited the proliferation of all the three HCC cell lines (SMMC7721, HepG2, Hep3B) tested in this study in a dose-dependent manner. Western blotting revealed that treatment HCC cells HepG2 with As 2 O 3 resulted in the increasing of FOXO3a expression and triggered phosphorylation of FOXO3a at the Thr 32 residue decrease. This FOXO3a accumulation correlated well with the As 2 O 3 -induced reduction of active Akt. Nuclear and cytoplasmic protein extracts isolated from the HCC cell line HepG2 revealed that the amount of nuclear FOXO3a was increased by treatment with As 2 O 3 , whereas the amount of cytoplasmic FOXO3a was decreased. Both As 2 O 3 and PI3K/Akt inhibitor Wortmannin induced cell cycle arrest. However, compared with As 2 O 3 alone, PI3K inhibitor Wortmannin combined with As 2 O 3 enhanced the antitumor effect of As 2 O 3 through induction of apoptosis. These findings suggest that As 2 O 3 at a clinically safe concentration may be an effective chemotherapeutic agent, and that As 2 O 3 and PI3K/Akt inhibitor Wortmannin may synergize for HCC cells. Taken together, the present study may suggest a specific molecular mechanism by which HCC cell lines are susceptible to the As 2 O 3 therapy through FOXO3a expression and localization.
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Arsenic agents have long been used as anticancer agents in traditional Chinese medicine. In this study, to evaluate the effect of As 2 O 3 on HCC cells, we investigate cell growth inhibition, cell cycle arrest, and the molecular mechanism after As 2 O 3 treatment in human HCC cells in vitro. We detected the proliferation of HCC cells by the Cell Counting Kit and FACS/Calibur Flow Cytometer and analyzed the expression and localization of FOXO3a by Western blotting Analysis and Cell Fractionation. Furthermore, we study the Akt activation after As 2 O 3 treatment and the HCC cells proliferation after combination of As 2 O 3 with PI3K inhibitor Wortmannin. As 2 O 3 significantly inhibited the proliferation of all the three HCC cell lines (SMMC7721, HepG2, Hep3B) tested in this study in a dose-dependent manner. Western blotting revealed that treatment HCC cells HepG2 with As 2 O 3 resulted in the increasing of FOXO3a expression and triggered phosphorylation of FOXO3a at the Thr 32 residue decrease. This FOXO3a accumulation correlated well with the As 2 O 3 -induced reduction of active Akt. Nuclear and cytoplasmic protein extracts isolated from the HCC cell line HepG2 revealed that the amount of nuclear FOXO3a was increased by treatment with As 2 O 3 , whereas the amount of cytoplasmic FOXO3a was decreased. Both As 2 O 3 and PI3K/Akt inhibitor Wortmannin induced cell cycle arrest. However, compared with As 2 O 3 alone, PI3K inhibitor Wortmannin combined with As 2 O 3 enhanced the antitumor effect of As 2 O 3 through induction of apoptosis. These findings suggest that As 2 O 3 at a clinically safe concentration may be an effective chemotherapeutic agent, and that As 2 O 3 and PI3K/Akt inhibitor Wortmannin may synergize for HCC cells. 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Arsenic agents have long been used as anticancer agents in traditional Chinese medicine. In this study, to evaluate the effect of As 2 O 3 on HCC cells, we investigate cell growth inhibition, cell cycle arrest, and the molecular mechanism after As 2 O 3 treatment in human HCC cells in vitro. We detected the proliferation of HCC cells by the Cell Counting Kit and FACS/Calibur Flow Cytometer and analyzed the expression and localization of FOXO3a by Western blotting Analysis and Cell Fractionation. Furthermore, we study the Akt activation after As 2 O 3 treatment and the HCC cells proliferation after combination of As 2 O 3 with PI3K inhibitor Wortmannin. As 2 O 3 significantly inhibited the proliferation of all the three HCC cell lines (SMMC7721, HepG2, Hep3B) tested in this study in a dose-dependent manner. 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Arsenic agents have long been used as anticancer agents in traditional Chinese medicine. In this study, to evaluate the effect of As 2 O 3 on HCC cells, we investigate cell growth inhibition, cell cycle arrest, and the molecular mechanism after As 2 O 3 treatment in human HCC cells in vitro. We detected the proliferation of HCC cells by the Cell Counting Kit and FACS/Calibur Flow Cytometer and analyzed the expression and localization of FOXO3a by Western blotting Analysis and Cell Fractionation. Furthermore, we study the Akt activation after As 2 O 3 treatment and the HCC cells proliferation after combination of As 2 O 3 with PI3K inhibitor Wortmannin. As 2 O 3 significantly inhibited the proliferation of all the three HCC cell lines (SMMC7721, HepG2, Hep3B) tested in this study in a dose-dependent manner. Western blotting revealed that treatment HCC cells HepG2 with As 2 O 3 resulted in the increasing of FOXO3a expression and triggered phosphorylation of FOXO3a at the Thr 32 residue decrease. This FOXO3a accumulation correlated well with the As 2 O 3 -induced reduction of active Akt. Nuclear and cytoplasmic protein extracts isolated from the HCC cell line HepG2 revealed that the amount of nuclear FOXO3a was increased by treatment with As 2 O 3 , whereas the amount of cytoplasmic FOXO3a was decreased. Both As 2 O 3 and PI3K/Akt inhibitor Wortmannin induced cell cycle arrest. However, compared with As 2 O 3 alone, PI3K inhibitor Wortmannin combined with As 2 O 3 enhanced the antitumor effect of As 2 O 3 through induction of apoptosis. These findings suggest that As 2 O 3 at a clinically safe concentration may be an effective chemotherapeutic agent, and that As 2 O 3 and PI3K/Akt inhibitor Wortmannin may synergize for HCC cells. Taken together, the present study may suggest a specific molecular mechanism by which HCC cell lines are susceptible to the As 2 O 3 therapy through FOXO3a expression and localization.</abstract><cop>New York</cop><pub>Humana Press Inc</pub><pmid>18937079</pmid><doi>10.1007/s12032-008-9105-8</doi><tpages>8</tpages></addata></record>
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subjects Androstadienes - pharmacology
Antineoplastic Agents - therapeutic use
Arsenicals - therapeutic use
Carcinoma, Hepatocellular - drug therapy
Carcinoma, Hepatocellular - enzymology
Carcinoma, Hepatocellular - metabolism
Cell Line, Tumor
Cell Proliferation - drug effects
Cell Survival - drug effects
Forkhead Box Protein O3
Forkhead Transcription Factors - analysis
Forkhead Transcription Factors - metabolism
Hematology
Humans
Internal Medicine
Liver Neoplasms - drug therapy
Liver Neoplasms - enzymology
Liver Neoplasms - metabolism
Medicine
Medicine & Public Health
Metabolic Networks and Pathways - drug effects
Oncology
Original Paper
Oxides - therapeutic use
Pathology
Phosphatidylinositol 3-Kinases - antagonists & inhibitors
Phosphatidylinositol 3-Kinases - metabolism
Proto-Oncogene Proteins c-akt - metabolism
title Arsenic trioxide-induced growth arrest of human hepatocellular carcinoma cells involving FOXO3a expression and localization
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