title: Twist overexpression promoted epithelial-to-mesenchymal transition of human peritoneal mesothelial cells under high glucose.
abstract: BACKGROUND
  Long-term peritoneal dialysis (PD) results in functional and structural alterations of the peritoneal membrane. Previous studies have suggested that high glucose (HG) could induce transdifferentiation of peritoneal mesothelial cells into myofibroblasts, but the molecular mechanisms of HG-induced epithelial-to-mesenchymal transition (EMT) of human peritoneal mesothelial cells (HPMCs) are unclear. This study was undertaken to elucidate the effects and mechanisms of Twist on HG-induced EMT of HPMCs.
  
  
  METHODS
  HPMCs were exposed to 5.6 mM glucose [normal glucose (NG)], 50 mM glucose (HG) or 50 mM glucose with Si-Twist or pcDNA3.1-Twist. Western blot and immuocytochemistry were performed to determine Twist, E-cadherin and α-smooth muscle actin (α-SMA) protein expression. MMP2 and MMP9 were detected by zymography. Rats were daily instilled with PD fluid and lipopolysaccharide (LPS) or sodium chloride during 6 weeks. Histological analyses were carried out in parietal peritoneum. Twist was detected by western blotting.
  
  
  RESULTS
  Twist and α-SMA protein and immuocytochemistry were significantly increased in HG-conditioned media compared to NG media. E-cadherin protein was lower in pcDNA3.1-Twist-transfected HPMCs compared to pcDNA3.1 cells. Twist protein was upregulated 12 h after HG stimulation. MMP9 was increased in pcDNA3.1-Twist-transfected HPMCs compared to pcDNA3.1 cells. Exposure of rat peritoneum to PD fluid and LPS resulted in an increase of extracellular matrix deposition. Twist and α-SMA were stained in the PD fluid group and compared to the control group. Twist protein was significantly increased in the PD group.
  
  
  CONCLUSIONS
  In conclusion, HG-induced Twist expression might contribute to EMT of HPMCs. Twist may control EMT of HPMCs by regulating MMP9.
authors.affiliation: Department of Nephrology, Yangquan Coalmine Group General Hospital, Shanxi, China. ljh-0407@163.com
authors.forename: Cuixiang
authors.initials: C
authors.lastname: Li
authors.forename: Yuqing
authors.initials: Y
authors.lastname: Ren
authors.forename: Xiaotao
authors.initials: X
authors.lastname: Jia
authors.forename: Pengyuan
authors.initials: P
authors.lastname: Liang
authors.forename: Weijuan
authors.initials: W
authors.lastname: Lou
authors.forename: Lijie
authors.initials: L
authors.lastname: He
authors.forename: Man
authors.initials: M
authors.lastname: Li
authors.forename: Shiren
authors.initials: S
authors.lastname: Sun
authors.forename: Hanmin
authors.initials: H
authors.lastname: Wang
mesh_terms: D000818:Animals; D001786:Blood Glucose / Q000378:metabolism*; D015153:Blotting, Western; D018929:Cell Culture Techniques; D004847:Epithelial Cells / Q000187:drug effects / Q000378:metabolism*; D058750:Epithelial-Mesenchymal Transition; D004848:Epithelium / Q000378:metabolism*; D005947:Glucose / Q000494:pharmacology; D006801:Humans; D007150:Immunohistochemistry; D010537:Peritoneum / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D051381:Rats; D051879:Twist-Related Protein 1 / Q000096:biosynthesis* / Q000235:genetics
chemical_list: D001786:Blood Glucose; D051879:Twist-Related Protein 1; D005947:Glucose