Protective Effect of Radix Trichosanthis Extracts on Cytotoxicity of Pancreatic ${\beta}-Cells$ by Cytokines

싸이토카인 유발 췌장 ${\beta}$세포 독성에 대한 천화분 추출물의 방어효과

  • Song, Mi-Young (Department of Biochemistry, Medical School and Institute for Medical Sciences, Chonbuk National University) ;
  • Kim, Eun-Kyung (Department of Biochemistry, Medical School and Institute for Medical Sciences, Chonbuk National University) ;
  • Song, Je-Ho (Division of Beauty Design & Institute for Better Living, Wonkwang University)
  • 송미영 (전북대학교 의과대학 생화학교실) ;
  • 김은경 (전북대학교 의과대학 생화학교실) ;
  • 송제호 (원광대학교 뷰티디자인학부, 생활자원개발연구소)
  • Published : 2008.04.25

Abstract

In this study, the preventive effects of Radix Trichosanthis extracts (RTE) against cytokine-induced ${\beta}-cell$ death were assessed. Cytokines generated by immune cells infiltrating pancreatic islets are crucial mediators of ${\beta}-cell$ destruction in insulin-dependent diabetes mellitus. The treatment of RIN cells with $interleukin-1{\beta}$ ($IL-1{\beta}$) and $interferon-{\gamma}$ ($IFN-{\gamma}$) resulted in a reduction of cell viability. RTE protected $IL-1{\beta}$ and $IFN-{\gamma}$-mediated viability reduction in a concentration-dependent manner. Incubation with RTE also induced a significant suppression of $IL-1{\beta}$ and $IFN-{\gamma}$-induced inducible nitric oxide synthase (iNOS) protein expression. The molecular mechanism by which RTE inhibited iNOS protein expression appeared to involve the inhibition of $NF{-\kappa}B$ activation. The $IL-1{\beta}$ and $IFN-{\gamma}$-stimulated RIN cells showed increases in $NF{-\kappa}B$ binding activityand $I{\kappa}B{\alpha}$ degradation in cytosol compared to unstimulated cells. However, pretreatment with RTE inhibited cytokines-induced $I{\kappa}B{\alpha}$ degradation and $NF{-\kappa}B$ activation in RINm5F cells. Furthermore, the protective effects of RTE were verified via protection of impairment in glucose-stimulated insulin secretions in $IL-1{\beta}$ and $IFN-{\gamma}$-treated islets.

Keywords

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