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Article

AGR2 silencing contributes to metformin‑dependent sensitization of colorectal cancer cells to chemotherapy

  • Authors:
    • Andrea Martisova
    • Lucia Sommerova
    • Katarina Kuricova
    • Jan Podhorec
    • Borivoj Vojtesek
    • Katerina Kankova
    • Roman Hrstka
  • View Affiliations / Copyright

    Affiliations: Regional Centre for Applied Molecular Oncology, Masaryk Memorial Cancer Institute, 656 53 Brno, Czech Republic, Department of Pathophysiology, Faculty of Medicine, Masaryk University, 625 00 Brno, Czech Republic
  • Pages: 4964-4973
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    Published online on: September 4, 2019
       https://doi.org/10.3892/ol.2019.10800
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Abstract

There is growing epidemiological evidence indicating an association between diabetes mellitus and the increased incidence of colorectal cancer (CRC). The preferred initial and most widely used pharmacological agent for the treatment of type 2 diabetes is metformin, which in parallel reduces the risk of CRC and improves patient prognosis. AMP‑activated protein kinase (AMPK) appears to be tightly associated with the beneficial metabolic effects of metformin, serving as a cellular energy sensor activated in response to a variety of conditions that deplete cellular energy levels. Such conditions include nutrient starvation (particularly glucose), hypoxia and exposure to toxins that inhibit the mitochondrial respiratory chain complex. The aim of the present study was to determine the effect of metformin on CRC cell lines, with different levels of anterior gradient 2 (AGR2) expression, exposed to 5‑fluorouracil (5‑FU) and oxaliplatin, alone or in combination with metformin. AGR2 has recently emerged as a factor involved in colon carcinogenesis. In AGR2‑knockout cells, markedly higher levels of phosphorylated‑AMPK were observed in comparison with control cells transfected with GFP‑scrambled guide RNA, which indicated that the presence of AGR2 may interfere with the metformin‑dependent activation of AMPK. In addition, metformin in combination with 5‑FU and oxaliplatin induced ROS production and attenuated autophagy. This effect was enhanced in AGR2‑knockout cells.
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Spandidos Publications style
Martisova A, Sommerova L, Kuricova K, Podhorec J, Vojtesek B, Kankova K and Hrstka R: AGR2 silencing contributes to metformin‑dependent sensitization of colorectal cancer cells to chemotherapy. Oncol Lett 18: 4964-4973, 2019.
APA
Martisova, A., Sommerova, L., Kuricova, K., Podhorec, J., Vojtesek, B., Kankova, K., & Hrstka, R. (2019). AGR2 silencing contributes to metformin‑dependent sensitization of colorectal cancer cells to chemotherapy. Oncology Letters, 18, 4964-4973. https://doi.org/10.3892/ol.2019.10800
MLA
Martisova, A., Sommerova, L., Kuricova, K., Podhorec, J., Vojtesek, B., Kankova, K., Hrstka, R."AGR2 silencing contributes to metformin‑dependent sensitization of colorectal cancer cells to chemotherapy". Oncology Letters 18.5 (2019): 4964-4973.
Chicago
Martisova, A., Sommerova, L., Kuricova, K., Podhorec, J., Vojtesek, B., Kankova, K., Hrstka, R."AGR2 silencing contributes to metformin‑dependent sensitization of colorectal cancer cells to chemotherapy". Oncology Letters 18, no. 5 (2019): 4964-4973. https://doi.org/10.3892/ol.2019.10800
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Spandidos Publications style
Martisova A, Sommerova L, Kuricova K, Podhorec J, Vojtesek B, Kankova K and Hrstka R: AGR2 silencing contributes to metformin‑dependent sensitization of colorectal cancer cells to chemotherapy. Oncol Lett 18: 4964-4973, 2019.
APA
Martisova, A., Sommerova, L., Kuricova, K., Podhorec, J., Vojtesek, B., Kankova, K., & Hrstka, R. (2019). AGR2 silencing contributes to metformin‑dependent sensitization of colorectal cancer cells to chemotherapy. Oncology Letters, 18, 4964-4973. https://doi.org/10.3892/ol.2019.10800
MLA
Martisova, A., Sommerova, L., Kuricova, K., Podhorec, J., Vojtesek, B., Kankova, K., Hrstka, R."AGR2 silencing contributes to metformin‑dependent sensitization of colorectal cancer cells to chemotherapy". Oncology Letters 18.5 (2019): 4964-4973.
Chicago
Martisova, A., Sommerova, L., Kuricova, K., Podhorec, J., Vojtesek, B., Kankova, K., Hrstka, R."AGR2 silencing contributes to metformin‑dependent sensitization of colorectal cancer cells to chemotherapy". Oncology Letters 18, no. 5 (2019): 4964-4973. https://doi.org/10.3892/ol.2019.10800
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