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Suppression of STAT5b in pancreatic cancer cells leads to attenuated gemcitabine chemoresistance, adhesion and invasion

  • Authors:
    • Hiroki Sumiyoshi
    • Akira Matsushita
    • Yoshiharu Nakamura
    • Yoko Matsuda
    • Toshiyuki Ishiwata
    • Zenya Naito
    • Eiji Uchida
  • View Affiliations / Copyright

    Affiliations: Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery, Nippon Medical School, Tokyo, Japan, Department of Pathology, Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology, Tokyo, Japan, Department of Integrated Diagnostic Pathology, Nippon Medical School, Tokyo, Japan
    Copyright: © Sumiyoshi et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 3216-3226
    |
    Published online on: April 1, 2016
       https://doi.org/10.3892/or.2016.4727
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Abstract

Pancreatic ductal adenocarcinoma (PDAC) is one of the most lethal solid malignancies, and there is an urgent need for new therapeutic strategies based on the molecular biology of PDAC. Signal transducers and activators of transcription 5 (STAT5) are known to be activated in a variety of malignancies and involved in tumor proliferation, apoptosis, and invasion, whereas the expression and biological role of STAT5b in PDAC are less clearly defined. In the present study, we examined the expression and role of STAT5b in human pancreatic cancer cell lines. Expressions of STAT5b mRNA and protein were detected in eight kinds of pancreatic cancer cells. Confocal microscopy and western blot analysis indicated that STAT5b is localized in both cytoplasm and nuclei. Immunoprecipitation analysis revealed tyrosine phosphorylation of STAT5b in pancreatic cancer cells. These results indicate that STAT5b in pancreatic cancer cells is constitutively activated. STAT5b shRNA clones in PANC-1 cells, which express relatively high levels of STAT5b, exhibited reduced chemoresistance against gemcitabine, adhesion and invasion compared to sham. On the other hand, AsPC-1 and BxPC3 cells, which express relatively low levels of STAT5b, exhibited reduced chemoresistance compared to PANC-1 cells. Moreover, STAT5b overexpression clones in AsPC-1 cells exhibited increased chemoresistance compared to sham. STAT5b shRNA clones in PANC-1 cells were more sensitive to the proapoptotic actions of gemcitabine, as evidenced by PARP and cleaved caspase-3 activation. Gemcitabine also significantly reduced Bcl-xL levels in the STAT5b shRNA-expressing cells. We also investigated the clinicopathological characteristics of STAT5b expression of PDAC. Although a significant correlation between STAT5b expression and overall survival rates was not observed, a significant correlation with main pancreatic duct invasion was observed. These findings suggest that STAT5b confers gemcitabine chemoresistance and promotes cell adherence and invasiveness in pancreatic cancer cells. Targeting STAT5b may lead to novel therapeutic strategies for PDAC.
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Copy and paste a formatted citation
Spandidos Publications style
Sumiyoshi H, Matsushita A, Nakamura Y, Matsuda Y, Ishiwata T, Naito Z and Uchida E: Suppression of STAT5b in pancreatic cancer cells leads to attenuated gemcitabine chemoresistance, adhesion and invasion. Oncol Rep 35: 3216-3226, 2016.
APA
Sumiyoshi, H., Matsushita, A., Nakamura, Y., Matsuda, Y., Ishiwata, T., Naito, Z., & Uchida, E. (2016). Suppression of STAT5b in pancreatic cancer cells leads to attenuated gemcitabine chemoresistance, adhesion and invasion. Oncology Reports, 35, 3216-3226. https://doi.org/10.3892/or.2016.4727
MLA
Sumiyoshi, H., Matsushita, A., Nakamura, Y., Matsuda, Y., Ishiwata, T., Naito, Z., Uchida, E."Suppression of STAT5b in pancreatic cancer cells leads to attenuated gemcitabine chemoresistance, adhesion and invasion". Oncology Reports 35.6 (2016): 3216-3226.
Chicago
Sumiyoshi, H., Matsushita, A., Nakamura, Y., Matsuda, Y., Ishiwata, T., Naito, Z., Uchida, E."Suppression of STAT5b in pancreatic cancer cells leads to attenuated gemcitabine chemoresistance, adhesion and invasion". Oncology Reports 35, no. 6 (2016): 3216-3226. https://doi.org/10.3892/or.2016.4727
Copy and paste a formatted citation
x
Spandidos Publications style
Sumiyoshi H, Matsushita A, Nakamura Y, Matsuda Y, Ishiwata T, Naito Z and Uchida E: Suppression of STAT5b in pancreatic cancer cells leads to attenuated gemcitabine chemoresistance, adhesion and invasion. Oncol Rep 35: 3216-3226, 2016.
APA
Sumiyoshi, H., Matsushita, A., Nakamura, Y., Matsuda, Y., Ishiwata, T., Naito, Z., & Uchida, E. (2016). Suppression of STAT5b in pancreatic cancer cells leads to attenuated gemcitabine chemoresistance, adhesion and invasion. Oncology Reports, 35, 3216-3226. https://doi.org/10.3892/or.2016.4727
MLA
Sumiyoshi, H., Matsushita, A., Nakamura, Y., Matsuda, Y., Ishiwata, T., Naito, Z., Uchida, E."Suppression of STAT5b in pancreatic cancer cells leads to attenuated gemcitabine chemoresistance, adhesion and invasion". Oncology Reports 35.6 (2016): 3216-3226.
Chicago
Sumiyoshi, H., Matsushita, A., Nakamura, Y., Matsuda, Y., Ishiwata, T., Naito, Z., Uchida, E."Suppression of STAT5b in pancreatic cancer cells leads to attenuated gemcitabine chemoresistance, adhesion and invasion". Oncology Reports 35, no. 6 (2016): 3216-3226. https://doi.org/10.3892/or.2016.4727
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