Effects of Glucose Degradation Products on Human Peritoneal Mesothelial Cells

포도당분해산물이 사람 복막중피세포 활성화에 미치는 영향

  • 송재숙 (이화여자대학교 약학대학) ;
  • 이경림 (이화여자대학교 약학대학) ;
  • 하헌주 (이화여자대학교 약학대학)
  • Published : 2005.12.01

Abstract

Both high glucose and glucose degradation products (GDP) have been implicated in alterations of peritoneal membrane structure and function during long-term peritoneal dialysis (PD). The present study examined the role of GDP including methylglyoxal (MGO), acetaldehyde, and 3,4-dideoxyglucosone (3,4-DGE) in HPMC activation with respect to membrane hyperpermeability or fibrosis. The role of reactive oxygen species (ROS) and activation of protein kinase C (PKC) in GDP-induced HPMC activation were also examined. Using M199 culture medium as control, growth arrested and synchronized HPMC were continuously stimulated by MGO, acetaldehyde, and 3,4-DGE for 48 hours. Vascular endothelial growth factor (VEGF) was quantified as a marker of peritoneal membrane hyperpermeability and fibronectin and heat shock protein 47 (hsp47) as markers of fibrosis. Involvement of ROS and PKC was examined by the inhibitory effect of N-acetylcystein (NAC) or calphostin C, respectively. MGO significantly increased VEGF (1.9-fold), fibronectin (1.5-fold), and hsp47 (1.3-fold) secretion compared with control M199. NAC and calphostin C effectively inhibited MGO-induced VEGF upregulation. Acetaldehyde stimulated and 3,4-DGE inhibited VEGF secretion. Fibronectin secretion and hsp47 expression in HPMC were not affected by acetaldehyde or 3,4-DGE In conclusion, MGO upregulated VEGF and fibronectin secretion and hsp47 expression in HPMC, and PKC as well as ROS mediate MGO-induced VEGF secretion by HPMC. This implies that PKC activation and ROS generation by GDP may constitute important signals for activation of HPMC leading to progressive membrane hyperpermeability and accumulation of extracellular matrix and eventual peritoneal fibrosis.

Keywords

Human peritoneal mesothelial cells;glucose degradation products;protein kinase C;reactive oxygen species;vascular endothelial growth factor;fibronectin;heat shock protein 47

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