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Intrinsic chemoresistance to gemcitabine is associated with constitutive and laminin-induced phosphorylation of FAK in pancreatic cancer cell lines

Doc number: 125 Abstract Background: One of the major reasons for poor prognosis of pancreatic cancer is its high resistance to currently available chemotherapeutic agents. In recent years, focal adhesion kinase (FAK), a central molecule in extracellular matrix (ECM)/integrin-mediated signaling, has... Full description

Journal Title: Molecular Cancer 2009, Vol.8, p.125
Main Author: Huanwen, Wu
Other Authors: Zhiyong, Liang , Xiaohua, Shi , Xinyu, Ren , Kai, Wang , Tonghua, Liu
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: DOI: 10.1186/1476-4598-8-125
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title: Intrinsic chemoresistance to gemcitabine is associated with constitutive and laminin-induced phosphorylation of FAK in pancreatic cancer cell lines
format: Article
creator:
  • Huanwen, Wu
  • Zhiyong, Liang
  • Xiaohua, Shi
  • Xinyu, Ren
  • Kai, Wang
  • Tonghua, Liu
subjects:
  • Antimetabolites, Antineoplastic–Pharmacology
  • Apoptosis–Analogs & Derivatives
  • Base Sequence–Pharmacology
  • Blotting, Western–Metabolism
  • Cell Line, Tumor–Metabolism
  • DNA Primers–Enzymology
  • Deoxycytidine–Metabolism
  • Deoxycytidine–Pathology
  • Drug Resistance, Neoplasm–Pathology
  • Flow Cytometry–Pathology
  • Fluorescent Antibody Technique–Pathology
  • Focal Adhesion Protein-Tyrosine Kinases–Pathology
  • Humans–Pathology
  • Laminin–Pathology
  • Pancreatic Neoplasms–Pathology
  • Pancreatic Neoplasms–Pathology
  • Pancreatic Neoplasms–Pathology
  • Phosphorylation–Pathology
  • RNA Interference–Pathology
  • Pancreas
  • Proteins
  • Kinases
  • Chemotherapy
  • Tumors
  • Antimetabolites, Antineoplastic
  • DNA Primers
  • Laminin
  • Deoxycytidine
  • Gemcitabine
  • Focal Adhesion Protein-Tyrosine Kinases
ispartof: Molecular Cancer, 2009, Vol.8, p.125
description: Doc number: 125 Abstract Background: One of the major reasons for poor prognosis of pancreatic cancer is its high resistance to currently available chemotherapeutic agents. In recent years, focal adhesion kinase (FAK), a central molecule in extracellular matrix (ECM)/integrin-mediated signaling, has been thought to be a key determinant of chemoresistance in cancer cells. In this study, we aimed to determine the roles of FAK phosphorylation in the intrinsic chemoresistance of pancreatic cancer cell lines. Results: Our results showed that, the level of constitutive phosphorylation of FAK at Tyr397 correlated with the extent of intrinsic resistance to Gemcitabine (Gem) in four pancreatic cancer cell lines. Moreover, in Panc-1 cells, which had high expression of pFAK, specific inhibition of constitutive FAK phosphorylation by either RNAi or FRNK overexpression decreased the phosphorylation of Akt, reduced the levels of survivin expression and Bad phosphorylation at Ser136 and increased Gem-induced cytotoxicity and apoptosis. However, in AsPC-1 cells with a low level of pFAK, neither FAK RNAi nor FRNK overexpression affected Gem-induced cell apoptosis. We further found that laminin (LN) induced FAK and Akt phosphorylation in a time-dependent manner, increased the levels of survivin and pBad (pS136) and decreased Gem-induced cytotoxicity and apoptosis in AsPC-1 cells; Specific inhibition of LN-induced FAK phosphorylation by either FAK RNAi or FRNK overexpression suppressed the effects of LN on AsPC-1 cells. Moreover, inhibition of constitutive FAK phosphorylation in Panc-1 cells and LN-induced FAK phosphorylation in AsPC-1 cells by a novel and more specific FAK phosphorylation inhibitor PF-573,228 showed similar results with those of FAK phosphorylation inhibition by FAK RNAi or FRNK overexpression. Conclusions: In conclusion, our research demonstrates for the first time that both constitutive and LN-induced FAK phosphorylation contribute to increased intrinsic chemoresistance to Gem in pancreatic cancer cell lines and these effects are partly due to the regulation of Akt and Bad phosphorylation and survivin expression. Development of selective FAK phosphorylation inhibitors may be a promising way to enhance chemosensitivity in pancreatic cancer.
language: eng
source:
identifier: DOI: 10.1186/1476-4598-8-125
fulltext: fulltext_linktorsrc
url: Link


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titleIntrinsic chemoresistance to gemcitabine is associated with constitutive and laminin-induced phosphorylation of FAK in pancreatic cancer cell lines
creatorHuanwen, Wu ; Zhiyong, Liang ; Xiaohua, Shi ; Xinyu, Ren ; Kai, Wang ; Tonghua, Liu
ispartofMolecular Cancer, 2009, Vol.8, p.125
identifierDOI: 10.1186/1476-4598-8-125
subjectAntimetabolites, Antineoplastic–Pharmacology ; Apoptosis–Analogs & Derivatives ; Base Sequence–Pharmacology ; Blotting, Western–Metabolism ; Cell Line, Tumor–Metabolism ; DNA Primers–Enzymology ; Deoxycytidine–Metabolism ; Deoxycytidine–Pathology ; Drug Resistance, Neoplasm–Pathology ; Flow Cytometry–Pathology ; Fluorescent Antibody Technique–Pathology ; Focal Adhesion Protein-Tyrosine Kinases–Pathology ; Humans–Pathology ; Laminin–Pathology ; Pancreatic Neoplasms–Pathology ; Pancreatic Neoplasms–Pathology ; Pancreatic Neoplasms–Pathology ; Phosphorylation–Pathology ; RNA Interference–Pathology ; Pancreas ; Proteins ; Kinases ; Chemotherapy ; Tumors ; Antimetabolites, Antineoplastic ; DNA Primers ; Laminin ; Deoxycytidine ; Gemcitabine ; Focal Adhesion Protein-Tyrosine Kinases
descriptionDoc number: 125 Abstract Background: One of the major reasons for poor prognosis of pancreatic cancer is its high resistance to currently available chemotherapeutic agents. In recent years, focal adhesion kinase (FAK), a central molecule in extracellular matrix (ECM)/integrin-mediated signaling, has been thought to be a key determinant of chemoresistance in cancer cells. In this study, we aimed to determine the roles of FAK phosphorylation in the intrinsic chemoresistance of pancreatic cancer cell lines. Results: Our results showed that, the level of constitutive phosphorylation of FAK at Tyr397 correlated with the extent of intrinsic resistance to Gemcitabine (Gem) in four pancreatic cancer cell lines. Moreover, in Panc-1 cells, which had high expression of pFAK, specific inhibition of constitutive FAK phosphorylation by either RNAi or FRNK overexpression decreased the phosphorylation of Akt, reduced the levels of survivin expression and Bad phosphorylation at Ser136 and increased Gem-induced cytotoxicity and apoptosis. However, in AsPC-1 cells with a low level of pFAK, neither FAK RNAi nor FRNK overexpression affected Gem-induced cell apoptosis. We further found that laminin (LN) induced FAK and Akt phosphorylation in a time-dependent manner, increased the levels of survivin and pBad (pS136) and decreased Gem-induced cytotoxicity and apoptosis in AsPC-1 cells; Specific inhibition of LN-induced FAK phosphorylation by either FAK RNAi or FRNK overexpression suppressed the effects of LN on AsPC-1 cells. Moreover, inhibition of constitutive FAK phosphorylation in Panc-1 cells and LN-induced FAK phosphorylation in AsPC-1 cells by a novel and more specific FAK phosphorylation inhibitor PF-573,228 showed similar results with those of FAK phosphorylation inhibition by FAK RNAi or FRNK overexpression. Conclusions: In conclusion, our research demonstrates for the first time that both constitutive and LN-induced FAK phosphorylation contribute to increased intrinsic chemoresistance to Gem in pancreatic cancer cell lines and these effects are partly due to the regulation of Akt and Bad phosphorylation and survivin expression. Development of selective FAK phosphorylation inhibitors may be a promising way to enhance chemosensitivity in pancreatic cancer.
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titleIntrinsic chemoresistance to gemcitabine is associated with constitutive and laminin-induced phosphorylation of FAK in pancreatic cancer cell lines
descriptionDoc number: 125 Abstract Background: One of the major reasons for poor prognosis of pancreatic cancer is its high resistance to currently available chemotherapeutic agents. In recent years, focal adhesion kinase (FAK), a central molecule in extracellular matrix (ECM)/integrin-mediated signaling, has been thought to be a key determinant of chemoresistance in cancer cells. In this study, we aimed to determine the roles of FAK phosphorylation in the intrinsic chemoresistance of pancreatic cancer cell lines. Results: Our results showed that, the level of constitutive phosphorylation of FAK at Tyr397 correlated with the extent of intrinsic resistance to Gemcitabine (Gem) in four pancreatic cancer cell lines. Moreover, in Panc-1 cells, which had high expression of pFAK, specific inhibition of constitutive FAK phosphorylation by either RNAi or FRNK overexpression decreased the phosphorylation of Akt, reduced the levels of survivin expression and Bad phosphorylation at Ser136 and increased Gem-induced cytotoxicity and apoptosis. However, in AsPC-1 cells with a low level of pFAK, neither FAK RNAi nor FRNK overexpression affected Gem-induced cell apoptosis. We further found that laminin (LN) induced FAK and Akt phosphorylation in a time-dependent manner, increased the levels of survivin and pBad (pS136) and decreased Gem-induced cytotoxicity and apoptosis in AsPC-1 cells; Specific inhibition of LN-induced FAK phosphorylation by either FAK RNAi or FRNK overexpression suppressed the effects of LN on AsPC-1 cells. Moreover, inhibition of constitutive FAK phosphorylation in Panc-1 cells and LN-induced FAK phosphorylation in AsPC-1 cells by a novel and more specific FAK phosphorylation inhibitor PF-573,228 showed similar results with those of FAK phosphorylation inhibition by FAK RNAi or FRNK overexpression. Conclusions: In conclusion, our research demonstrates for the first time that both constitutive and LN-induced FAK phosphorylation contribute to increased intrinsic chemoresistance to Gem in pancreatic cancer cell lines and these effects are partly due to the regulation of Akt and Bad phosphorylation and survivin expression. Development of selective FAK phosphorylation inhibitors may be a promising way to enhance chemosensitivity in pancreatic cancer.
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1Apoptosis–Analogs & Derivatives
2Base Sequence–Pharmacology
3Blotting, Western–Metabolism
4Cell Line, Tumor–Metabolism
5DNA Primers–Enzymology
6Deoxycytidine–Metabolism
7Deoxycytidine–Pathology
8Drug Resistance, Neoplasm–Pathology
9Flow Cytometry–Pathology
10Fluorescent Antibody Technique–Pathology
11Focal Adhesion Protein-Tyrosine Kinases–Pathology
12Humans–Pathology
13Laminin–Pathology
14Pancreatic Neoplasms–Pathology
15Phosphorylation–Pathology
16RNA Interference–Pathology
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18Proteins
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20Chemotherapy
21Tumors
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23DNA Primers
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titleIntrinsic chemoresistance to gemcitabine is associated with constitutive and laminin-induced phosphorylation of FAK in pancreatic cancer cell lines
authorHuanwen, Wu ; Zhiyong, Liang ; Xiaohua, Shi ; Xinyu, Ren ; Kai, Wang ; Tonghua, Liu
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3Blotting, Western–Metabolism
4Cell Line, Tumor–Metabolism
5DNA Primers–Enzymology
6Deoxycytidine–Metabolism
7Deoxycytidine–Pathology
8Drug Resistance, Neoplasm–Pathology
9Flow Cytometry–Pathology
10Fluorescent Antibody Technique–Pathology
11Focal Adhesion Protein-Tyrosine Kinases–Pathology
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abstractDoc number: 125 Abstract Background: One of the major reasons for poor prognosis of pancreatic cancer is its high resistance to currently available chemotherapeutic agents. In recent years, focal adhesion kinase (FAK), a central molecule in extracellular matrix (ECM)/integrin-mediated signaling, has been thought to be a key determinant of chemoresistance in cancer cells. In this study, we aimed to determine the roles of FAK phosphorylation in the intrinsic chemoresistance of pancreatic cancer cell lines. Results: Our results showed that, the level of constitutive phosphorylation of FAK at Tyr397 correlated with the extent of intrinsic resistance to Gemcitabine (Gem) in four pancreatic cancer cell lines. Moreover, in Panc-1 cells, which had high expression of pFAK, specific inhibition of constitutive FAK phosphorylation by either RNAi or FRNK overexpression decreased the phosphorylation of Akt, reduced the levels of survivin expression and Bad phosphorylation at Ser136 and increased Gem-induced cytotoxicity and apoptosis. However, in AsPC-1 cells with a low level of pFAK, neither FAK RNAi nor FRNK overexpression affected Gem-induced cell apoptosis. We further found that laminin (LN) induced FAK and Akt phosphorylation in a time-dependent manner, increased the levels of survivin and pBad (pS136) and decreased Gem-induced cytotoxicity and apoptosis in AsPC-1 cells; Specific inhibition of LN-induced FAK phosphorylation by either FAK RNAi or FRNK overexpression suppressed the effects of LN on AsPC-1 cells. Moreover, inhibition of constitutive FAK phosphorylation in Panc-1 cells and LN-induced FAK phosphorylation in AsPC-1 cells by a novel and more specific FAK phosphorylation inhibitor PF-573,228 showed similar results with those of FAK phosphorylation inhibition by FAK RNAi or FRNK overexpression. Conclusions: In conclusion, our research demonstrates for the first time that both constitutive and LN-induced FAK phosphorylation contribute to increased intrinsic chemoresistance to Gem in pancreatic cancer cell lines and these effects are partly due to the regulation of Akt and Bad phosphorylation and survivin expression. Development of selective FAK phosphorylation inhibitors may be a promising way to enhance chemosensitivity in pancreatic cancer.
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pubBioMed Central
doi10.1186/1476-4598-8-125
urlhttp://search.proquest.com/docview/1353020472/
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