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Article

Occludin downregulation in high glucose is regulated by SSTR2 via the VEGF/NRP1/Akt signaling pathway in RF/6A cells

  • Authors:
    • Mengling Li
    • Shuaiwei Wang
    • Songjiang Wang
    • Lei Zhang
    • Dongdong Wu
    • Ruisheng Yang
    • Ailing Ji
    • Yanzhang Li
    • Jun Wang
  • View Affiliations / Copyright

    Affiliations: Department of Physiology, Henan University School of Medicine, Kaifeng, Henan 475004, P.R. China, Department of Clinical Laboratory, The First Affiliated Hospital of Henan University, Kaifeng, Henan 475001, P.R. China
  • Pages: 1732-1738
    |
    Published online on: June 22, 2017
       https://doi.org/10.3892/etm.2017.4651
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Abstract

Occludin is a tight junction protein that forms the permeability barrier, which is typically disturbed in ischemic associated diseases. The aim of the present study was to determine whether somatostatin receptor 2 (SSTR2) in RF/6A cells is involved in the modulation of the downregulation of occludin induced by high glucose, and to evaluate the implicated molecules. RF/6A cells were maintained in Dulbecco's modified Eagle medium and treated with 0 or 30 mM D‑glucose. SSTR2 agonist octreotide (OCT), OCT with SSTR2 antagonist cycle‑somatostatin (c‑SOM) and neuropilin 1 (NRP1) inhibitor ATWLPPR, respectively, were administered to RF/6A cells under high glucose conditions. Cell apoptosis was evaluated by terminal deoxynucleotidyl transferase dUTP nick‑end labeling. Western blot analysis was used to detect the protein expression level of SSTR2, occludin, vascular endothelial growth factor (VEGF), protein kinase B (Akt), phosphorylated Akt (p‑Akt), extracellular signal‑related kinases (ERK) and p‑ERK proteins. The amount of VEGF released was determined by ELISA. Notably, the level of occludin reduced significantly under high glucose conditions. The results indicated that the administration of OCT prevented the reduction of occludin induced by high glucose, and co‑administration with c‑SOM reversed the effect of OCT. Increased VEGF secretion and expression of VEGF, p‑Akt and p‑ERK in RF/6A cells induced by high glucose were inhibited by OCT. ATWLPPR also prevented the downregulation of occludin, but did not inhibit p‑Akt and p‑ERK levels under high glucose conditions. The current study concluded that the activation of SSTR2 prevents high glucose‑induced occludin downregulation in RF/6A cells, and VEGF, NRP1, p‑Akt and p‑ERK were implicated in this process. The pharmacological effects of SSTR2 targeting to endothelium may be used to assess the role of resistance of permeability and anti‑inflammation.
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Copy and paste a formatted citation
Spandidos Publications style
Li M, Wang S, Wang S, Zhang L, Wu D, Yang R, Ji A, Li Y and Wang J: Occludin downregulation in high glucose is regulated by SSTR2 via the VEGF/NRP1/Akt signaling pathway in RF/6A cells. Exp Ther Med 14: 1732-1738, 2017.
APA
Li, M., Wang, S., Wang, S., Zhang, L., Wu, D., Yang, R. ... Wang, J. (2017). Occludin downregulation in high glucose is regulated by SSTR2 via the VEGF/NRP1/Akt signaling pathway in RF/6A cells. Experimental and Therapeutic Medicine, 14, 1732-1738. https://doi.org/10.3892/etm.2017.4651
MLA
Li, M., Wang, S., Wang, S., Zhang, L., Wu, D., Yang, R., Ji, A., Li, Y., Wang, J."Occludin downregulation in high glucose is regulated by SSTR2 via the VEGF/NRP1/Akt signaling pathway in RF/6A cells". Experimental and Therapeutic Medicine 14.2 (2017): 1732-1738.
Chicago
Li, M., Wang, S., Wang, S., Zhang, L., Wu, D., Yang, R., Ji, A., Li, Y., Wang, J."Occludin downregulation in high glucose is regulated by SSTR2 via the VEGF/NRP1/Akt signaling pathway in RF/6A cells". Experimental and Therapeutic Medicine 14, no. 2 (2017): 1732-1738. https://doi.org/10.3892/etm.2017.4651
Copy and paste a formatted citation
x
Spandidos Publications style
Li M, Wang S, Wang S, Zhang L, Wu D, Yang R, Ji A, Li Y and Wang J: Occludin downregulation in high glucose is regulated by SSTR2 via the VEGF/NRP1/Akt signaling pathway in RF/6A cells. Exp Ther Med 14: 1732-1738, 2017.
APA
Li, M., Wang, S., Wang, S., Zhang, L., Wu, D., Yang, R. ... Wang, J. (2017). Occludin downregulation in high glucose is regulated by SSTR2 via the VEGF/NRP1/Akt signaling pathway in RF/6A cells. Experimental and Therapeutic Medicine, 14, 1732-1738. https://doi.org/10.3892/etm.2017.4651
MLA
Li, M., Wang, S., Wang, S., Zhang, L., Wu, D., Yang, R., Ji, A., Li, Y., Wang, J."Occludin downregulation in high glucose is regulated by SSTR2 via the VEGF/NRP1/Akt signaling pathway in RF/6A cells". Experimental and Therapeutic Medicine 14.2 (2017): 1732-1738.
Chicago
Li, M., Wang, S., Wang, S., Zhang, L., Wu, D., Yang, R., Ji, A., Li, Y., Wang, J."Occludin downregulation in high glucose is regulated by SSTR2 via the VEGF/NRP1/Akt signaling pathway in RF/6A cells". Experimental and Therapeutic Medicine 14, no. 2 (2017): 1732-1738. https://doi.org/10.3892/etm.2017.4651
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