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Article

Orexin A upregulates the protein expression of OX1R and enhances the proliferation of SGC-7901 gastric cancer cells through the ERK signaling pathway

  • Authors:
    • Yuanyuan Liu
    • Yuyan Zhao
    • Shujing Ju
    • Lei Guo
  • View Affiliations / Copyright

    Affiliations: Department of Endocrinology, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, P.R. China, Department of Orthopedic Surgery, First Affiliated Hospital, China Medical University, Shenyang, Liaoning 110001, P.R. China
  • Pages: 539-545
    |
    Published online on: December 15, 2014
       https://doi.org/10.3892/ijmm.2014.2038
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Abstract

Orexins are hypothalamic peptides that regulate food intake, wakefulness, the reward system and energy metabolism. Recent studies have demonstrated the ability of orexins to promote a robust apoptosis and subsequent inhibition of cell growth in various types of cancer cells. The present study was conducted to investigate the effects of orexin A on the survival of human gastric cancer cells, SGC‑7901, and the possible mechanisms. SGC‑7901 cells were exposed to various concentrations of orexin A in vitro in the presence or absence of the orexin receptor 1 (OX1R) antagonist (SB334867), extracellular signal‑regulated kinases 1 and 2 (ERK1/2) antagonist (U0126) or a combination of the two antagonists. The amount of cell proliferation, viability and apoptosis, caspase‑8 and caspases‑9 activities, OX1R protein expression and ERK1/2 protein levels were determined. The expression of OX1R in SGC‑7901 cells was observed. Orexin A (10-10 to 10-6 M) stimulated SGC‑7901 cell proliferation and viability, reduced the pro‑apoptotic activity of caspase‑9 and protected the cells from apoptosis in a dose‑dependent manner. Additionally, ERK1/2 phosphorylation was stimulated by orexin A (10-10 to 10-6 M). However, the OX1R antagonist SB334867 (10-6 M), ERK1/2 antagonist U0126 (30 µM) or the combination of antagonists blocked the effects of orexin A to a certain extent. These results suggest that stimulation of OX1R induces the growth of SGC‑7901 gastric cancer cells through activation of ERK1/2 signaling pathway. These findings add a new dimension to the biological activities of orexin, which may have important implications in health and disease, in particular gastric cancer.
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Copy and paste a formatted citation
Spandidos Publications style
Liu Y, Zhao Y, Ju S and Guo L: Orexin A upregulates the protein expression of OX1R and enhances the proliferation of SGC-7901 gastric cancer cells through the ERK signaling pathway. Int J Mol Med 35: 539-545, 2015.
APA
Liu, Y., Zhao, Y., Ju, S., & Guo, L. (2015). Orexin A upregulates the protein expression of OX1R and enhances the proliferation of SGC-7901 gastric cancer cells through the ERK signaling pathway. International Journal of Molecular Medicine, 35, 539-545. https://doi.org/10.3892/ijmm.2014.2038
MLA
Liu, Y., Zhao, Y., Ju, S., Guo, L."Orexin A upregulates the protein expression of OX1R and enhances the proliferation of SGC-7901 gastric cancer cells through the ERK signaling pathway". International Journal of Molecular Medicine 35.2 (2015): 539-545.
Chicago
Liu, Y., Zhao, Y., Ju, S., Guo, L."Orexin A upregulates the protein expression of OX1R and enhances the proliferation of SGC-7901 gastric cancer cells through the ERK signaling pathway". International Journal of Molecular Medicine 35, no. 2 (2015): 539-545. https://doi.org/10.3892/ijmm.2014.2038
Copy and paste a formatted citation
x
Spandidos Publications style
Liu Y, Zhao Y, Ju S and Guo L: Orexin A upregulates the protein expression of OX1R and enhances the proliferation of SGC-7901 gastric cancer cells through the ERK signaling pathway. Int J Mol Med 35: 539-545, 2015.
APA
Liu, Y., Zhao, Y., Ju, S., & Guo, L. (2015). Orexin A upregulates the protein expression of OX1R and enhances the proliferation of SGC-7901 gastric cancer cells through the ERK signaling pathway. International Journal of Molecular Medicine, 35, 539-545. https://doi.org/10.3892/ijmm.2014.2038
MLA
Liu, Y., Zhao, Y., Ju, S., Guo, L."Orexin A upregulates the protein expression of OX1R and enhances the proliferation of SGC-7901 gastric cancer cells through the ERK signaling pathway". International Journal of Molecular Medicine 35.2 (2015): 539-545.
Chicago
Liu, Y., Zhao, Y., Ju, S., Guo, L."Orexin A upregulates the protein expression of OX1R and enhances the proliferation of SGC-7901 gastric cancer cells through the ERK signaling pathway". International Journal of Molecular Medicine 35, no. 2 (2015): 539-545. https://doi.org/10.3892/ijmm.2014.2038
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