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Role of 14-3-3Ο in poor prognosis and in radiation and drug resistance of human pancreatic cancers | BMC Cancer | Peer Review
Description:
Pancreatic cancer is the fourth leading cause of death in the US. Unlike other solid tumors such as testicular cancer which are now curable, more than 90% of pancreatic cancer patients die due to lack of response to therapy. Recently, the level of 14-3-3Ο mRNA was found to be increased in pancreatic cancers and this increased expression may contribute to the failure in treatment of pancreatic cancers. In the present study, we tested this hypothesis. Western blot analysis was used to determine 14-3-3Ο protein level in fresh frozen tissues and was correlated to clinical outcome. A stable cell line expressing 14-3-3Ο was established and the effect of 14-3-3Ο over-expression on cellular response to radiation and anticancer drugs were tested using SRB assay and clonogenic assays. Cell cycle distribution and apoptosis analyses were performed using propidium iodide staining and PARP cleavage assays. We found that 14-3-3Ο protein level was increased significantly in about 71% (17 of 24) of human pancreatic cancer tissues and that the 14-3-3Ο protein level in cancers correlated with lymph node metastasis and poor prognosis. Furthermore, we demonstrated that over-expression of 14-3-3Ο in a pancreatic cancer cell line caused resistance to Ξ³-irradiation as well as anticancer drugs by causing resistance to treatment-induced apoptosis and G2/M arrest. The increased level of 14-3-3Ο protein likely contributes to the poor clinical outcome of human pancreatic cancers by causing resistance to radiation and anticancer drugs. Thus, 14-3-3Ο may serve as a prognosis marker predicting survival of pancreatic cancer patients and guide the clinical treatment of these patients.
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headline:Role of 14-3-3Ο in poor prognosis and in radiation and drug resistance of human pancreatic cancers
description:Pancreatic cancer is the fourth leading cause of death in the US. Unlike other solid tumors such as testicular cancer which are now curable, more than 90% of pancreatic cancer patients die due to lack of response to therapy. Recently, the level of 14-3-3Ο mRNA was found to be increased in pancreatic cancers and this increased expression may contribute to the failure in treatment of pancreatic cancers. In the present study, we tested this hypothesis. Western blot analysis was used to determine 14-3-3Ο protein level in fresh frozen tissues and was correlated to clinical outcome. A stable cell line expressing 14-3-3Ο was established and the effect of 14-3-3Ο over-expression on cellular response to radiation and anticancer drugs were tested using SRB assay and clonogenic assays. Cell cycle distribution and apoptosis analyses were performed using propidium iodide staining and PARP cleavage assays. We found that 14-3-3Ο protein level was increased significantly in about 71% (17 of 24) of human pancreatic cancer tissues and that the 14-3-3Ο protein level in cancers correlated with lymph node metastasis and poor prognosis. Furthermore, we demonstrated that over-expression of 14-3-3Ο in a pancreatic cancer cell line caused resistance to Ξ³-irradiation as well as anticancer drugs by causing resistance to treatment-induced apoptosis and G2/M arrest. The increased level of 14-3-3Ο protein likely contributes to the poor clinical outcome of human pancreatic cancers by causing resistance to radiation and anticancer drugs. Thus, 14-3-3Ο may serve as a prognosis marker predicting survival of pancreatic cancer patients and guide the clinical treatment of these patients.
datePublished:2010-11-01T00:00:00Z
dateModified:2010-11-01T00:00:00Z
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Pancreatic Cancer
Gemcitabine
Pancreatic Cancer Cell
Mitoxantrone
Human Pancreatic Cancer
Cancer Research
Oncology
Surgical Oncology
Health Promotion and Disease Prevention
Biomedicine
general
Medicine/Public Health
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headline:Role of 14-3-3Ο in poor prognosis and in radiation and drug resistance of human pancreatic cancers
description:Pancreatic cancer is the fourth leading cause of death in the US. Unlike other solid tumors such as testicular cancer which are now curable, more than 90% of pancreatic cancer patients die due to lack of response to therapy. Recently, the level of 14-3-3Ο mRNA was found to be increased in pancreatic cancers and this increased expression may contribute to the failure in treatment of pancreatic cancers. In the present study, we tested this hypothesis. Western blot analysis was used to determine 14-3-3Ο protein level in fresh frozen tissues and was correlated to clinical outcome. A stable cell line expressing 14-3-3Ο was established and the effect of 14-3-3Ο over-expression on cellular response to radiation and anticancer drugs were tested using SRB assay and clonogenic assays. Cell cycle distribution and apoptosis analyses were performed using propidium iodide staining and PARP cleavage assays. We found that 14-3-3Ο protein level was increased significantly in about 71% (17 of 24) of human pancreatic cancer tissues and that the 14-3-3Ο protein level in cancers correlated with lymph node metastasis and poor prognosis. Furthermore, we demonstrated that over-expression of 14-3-3Ο in a pancreatic cancer cell line caused resistance to Ξ³-irradiation as well as anticancer drugs by causing resistance to treatment-induced apoptosis and G2/M arrest. The increased level of 14-3-3Ο protein likely contributes to the poor clinical outcome of human pancreatic cancers by causing resistance to radiation and anticancer drugs. Thus, 14-3-3Ο may serve as a prognosis marker predicting survival of pancreatic cancer patients and guide the clinical treatment of these patients.
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Pancreatic Cancer
Gemcitabine
Pancreatic Cancer Cell
Mitoxantrone
Human Pancreatic Cancer
Cancer Research
Oncology
Surgical Oncology
Health Promotion and Disease Prevention
Biomedicine
general
Medicine/Public Health
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