Dataset Information

Gemcitabine as a molecular targeting agent that blocks the Akt cascade in platinum-resistant ovarian cancer.

ABSTRACT:

Background

Gemcitabine (2', 2' -difluorodeoxycytidine) is one of many nonplatinum drugs that exhibit activity in recurrent, platinum-resistant ovarian cancer. However, the molecular mechanisms by which Gemcitabine treatment inhibits the proliferation of platinum-resistant ovarian cancer cells still remain unclear. We investigated whether Gemcitabine increases the efficacy of Cisplatin in platinum-resistant ovarian cancer models in vitro and in vivo.

Methods

We used Cisplatin-resistant Caov-3 cells, A2780CP cells and Cisplatin-sensitive A2780 cells to examine the sensitivity of the cell viability of Cisplatin and Gemcitabine using a 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium (MTS) assay and the sensitivity of the invasive activity of Cisplatin and Gemcitabine using an invasion assay with Matrigel. We examined the Akt kinase activity and matrix metalloproteinase 9 (MMP9) expression following Cisplatin and Gemcitabine treatment using a Western blot analysis and the mRNA expression of vascular endothelial growth factor (VEGF) using semi-quantitative RT-PCR. Moreover, we evaluated the effects of Cisplatin and Gemcitabine on the intra-abdominal dissemination of ovarian cancer in vivo.

Results

Gemcitabine significantly inhibited Cisplatin-induced Akt activation in the Caov-3 and A2780CP cells, but not in the A2780 cells. In the presence of Gemcitabine, Cisplatin-induced growth inhibition and apoptosis were significantly enhanced in the Caov-3 and A2780CP cells. Co-treatment with Cisplatin and Gemcitabine almost completely inhibited invasion of both types of cells through the Matrigel; however, neither Cisplatin nor Gemcitabine alone inhibited the invasion of both types of cells. Gemcitabine inhibited not only the Cisplatin-induced activation of Akt, but also the MMP9 and mRNA expression of VEGF. Moreover, treatment with Gemcitabine increased the efficacy of Cisplatin-induced growth inhibition of the intra-abdominal dissemination and production of ascites in the athymic nude mice inoculated with Caov-3 cells.

Conclusions

We herein demonstrated that Gemcitabine inhibits the Akt kinase activity and angiogenetic activity following treatment with Cisplatin in platinum-resistant ovarian cancer cells. These results provide a rationale for using Gemcitabine in clinical regimens containing molecular targeting agents against platinum-resistant ovarian cancers.

SUBMITTER: Kawaguchi H

PROVIDER: S-EPMC4234938 | biostudies-literature | 2014 Apr

REPOSITORIES: biostudies-literature

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Gemcitabine as a molecular targeting agent that blocks the Akt cascade in platinum-resistant ovarian cancer.

Kawaguchi Hiroshi H Terai Yoshito Y Tanabe Akiko A Sasaki Hiroshi H Takai Masaaki M Fujiwara Satoe S Ashihara Keisuke K Tanaka Yoshimichi Y Tanaka Tomohito T Tsunetoh Satoshi S Kanemura Masanori M Ohmichi Masahide M

Journal of ovarian research 20140409

<h4>Background</h4>Gemcitabine (2', 2' -difluorodeoxycytidine) is one of many nonplatinum drugs that exhibit activity in recurrent, platinum-resistant ovarian cancer. However, the molecular mechanisms by which Gemcitabine treatment inhibits the proliferation of platinum-resistant ovarian cancer cells still remain unclear. We investigated whether Gemcitabine increases the efficacy of Cisplatin in platinum-resistant ovarian cancer models in vitro and in vivo.<h4>Methods</h4>We used Cisplatin-resis ...[more]

PMID: 24713296

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Dataset Information

Gemcitabine as a molecular targeting agent that blocks the Akt cascade in platinum-resistant ovarian cancer.

Background

Methods

Results

Conclusions

Publications

Gemcitabine as a molecular targeting agent that blocks the Akt cascade in platinum-resistant ovarian cancer.

Similar Datasets

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