Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Fagopyritol, a Derivative of D-chiro-inositol, Induces GLUT4 Translocation via Actin Filament Remodeling in L6-GLUT4myc Skeletal Muscle Cells

랫드 근육세포에서 fagopyritol이 액틴 필라멘트 구조와 포도당 수송체 4에 미치는 영향

  • Nam, Hajin (Institute of Natural Medicine, Hallym University) ;
  • Hwang, In Koo (Department of Anatomy and Cell Biology, College of Veterinary Medicine, and Research Institute for Veterinary Science, Seoul National University) ;
  • Jung, Harry (Department of Medical Genetics, College of Medicine, Hallym University) ;
  • Kwon, Seung-Hae (Korea Basic Science Institute Chuncheon Center) ;
  • Park, Ok Kyu (Korea Basic Science Institute Chuncheon Center) ;
  • Suh, Jun Gyo (Institute of Natural Medicine, Hallym University)
  • 남하진 (한림대학교 천연의약연구소) ;
  • 황인구 (서울대학교 수의학과) ;
  • 정혜리 (한림대학교 의학유전학교실) ;
  • 권승해 (한국기초과학지원연구원 춘천센터) ;
  • 박옥규 (한국기초과학지원연구원 춘천센터) ;
  • 서준교 (한림대학교 천연의약연구소)
  • Received : 2013.08.07
  • Accepted : 2013.09.24
  • Published : 2013.09.30
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Abstract

Insulin induces glucose transporter 4 (GLUT4) translocation to the muscle cell surface. As fagopyritol has insulin-like effects, the effects of fagopyritol on GLUT4 translocation and filamentous (F) actin remodeling in L6-GLUT4myc skeletal muscle cells were investigated. Fagopyritol significantly increased plasma membrane GLUT4 levels compared with the basal control in L6-GLUT4myc myoblast cells. Phosphatidylinositol (PI) 3-kinase inhibitor (LY294002) treatment prevented GLUT4 translocation to the plasma membrane in the myoblasts. Fagopyritol treatment apparently stimulates F-actin remodeling in myoblasts. In addition, fagopyritol treatment induced GLUT4 translocation and F-actin remodeling in myotubes. Taken together, these results suggest that fagopyritol promotes GLUT4 translocation and F-actin remodeling by activating the PI 3-kinase-dependent signaling pathway.

인슐린은 근육세포 표면으로 포도당 수송체 4(glucose transporter 4, GLUT4)를 유도하여 혈액 속의 포도당을 세포 내로 유입시키도록 작용한다고 알려져 있다. Fagopyritol은 인슐린과 유사한 작용을 하는 것으로 알려져 있으므로, 본 연구에서는 혈당강하 효과가 있다고 알려진 fagopyritol을 랫드의 근육세포주(L6GLUT4myc 세포)에 처리하여, 아직 명확하게 밝혀지지 않은 fagopyritol의 혈당강하 기전을 규명하고자 수행하였다. Fagopyritol의 혈당강하 기전을 규명하기 위하여 근원세포(myoblast)와 근관세포(myotube)에 fagopyritol을 처리하여 액틴 필라멘트의 구조와 GLUT4에 미치는 영향을 분석하였다. Fagopyritol을 myoblast에 처리하였을 때, GLUT4가 처리군에서 대조군과 비교하여 유의 있게 원형질막 쪽으로 유도되는 것을 확인하였고, 액틴 필라멘트의 구조가 재조정되면서 GLUT4의 이동을 돕는 것으로 생각된다. 또한 fagopyritol이 인슐린과 유사한 작용 경로를 가지는지 확인하기 위하여, 인슐린 작용 경로에서 중요한 역할을 하는 것으로 알려진 phosphatidylinositol 3-kinase (PI3K)의 억제제인 LY294002를 fagopyritol과 함께 처리하였을 때 GLUT4가 원형질막 쪽으로 유도되지 않는 것을 확인하였다. Fagopyritol을 myotube에 처리하였을 때, myoblast에 처리하였을 때와 유사한 결과를 나타내었다. 이러한 결과를 종합하면 fagopyritol이 인슐린과 유사한 작용을 하여 액틴 필라멘트의 구조 변경과 GLUT4의 이동을 촉진시키는 것으로 사료된다.

Keywords

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