PEP-1-paraoxonase 1 fusion protein prevents cytokine-induced cell destruction and impaired insulin secretion in rat insulinoma cells

  • Lee, Su Jin (Department of Physiology, College of Medicine, Hallym University) ;
  • Kang, Hyung Kyung (Department of Physiology, College of Medicine, Korea University) ;
  • Choi, Yeon Joo (Department of Biomedical Science and Research Institute of Bioscience and Biotechnology, Hallym University) ;
  • Eum, Won Sik (Department of Biomedical Science and Research Institute of Bioscience and Biotechnology, Hallym University) ;
  • Park, Jinseu (Department of Biomedical Science and Research Institute of Bioscience and Biotechnology, Hallym University) ;
  • Choi, Soo Young (Department of Biomedical Science and Research Institute of Bioscience and Biotechnology, Hallym University) ;
  • Kwon, Hyeok Yil (Department of Physiology, College of Medicine, Hallym University)
  • Received : 2018.08.03
  • Accepted : 2018.09.10
  • Published : 2018.10.31


Pancreatic beta cell destruction and dysfunction induced by cytokines is a major cause of type 1 diabetes. Paraoxonase 1 (PON1), an arylesterase with antioxidant activity, has been shown to play an important role in preventing the development of diabetes in transgenic mice. However, no studies have examined the anti-diabetic effect of PON1 delivered to beta cells using protein transduction. In this study, we expressed the cell-permeable PON1 fused with PEP-1 protein transduction domain (PEP-1-PON1) to investigate whether transduced PEP-1-PON1 protects beta cells against cytokine-induced cytotoxicity. PEP-1-PON1 was effectively delivered to INS-1 cells and prevented cytokine-induced cell destruction in a dose-dependent manner. Transduced PEP-1-PON1 significantly reduced the levels of reactive oxygen species (ROS) and nitric oxide (NO), DNA fragmentation, and expression of inflammatory mediators, endoplasmic reticulum (ER) stress proteins, and apoptosis-related proteins in cytokine-treated cells. Moreover, transduced PEP-1-PON1 restored the decrease in basal and glucose-stimulated insulin secretion induced by cytokines. These data indicate that PEP-1-PON1 protects beta cells from cytokine-induced cytotoxicity by alleviating oxidative/nitrosative stress, ER stress, and inflammation. Thus, PEP-1-mediated PON1 transduction might be an effective method to reduce the extent of destruction and dysfunction of pancreatic beta cells in autoimmune diabetes.


Beta cell destruction;Cytokines;Diabetes;Insulin secretion;PEP-1-PON1


Supported by : National Research Foundation of Korea (NRF)


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