title: Caspase-3 and its inhibitor Ac-DEVD-CHO in rat lens epithelial cell apoptosis induced by hydrogen in vitro.
abstract: OBJECTIVE
  To investigate the role of caspase-3 and its inhibitor Ac-DEVD-CHO in rat lens epithelial cell apoptosis induced by hydrogen peroxide (H(2)O(2)) in vitro.
  
  
  METHODS
  Rat lenses were incubated in modified Eagle's medium containing 2 mmol/L H(2)O(2) to induce apoptosis in vitro. Apoptosis in lens epithelial cells was assessed by transmission electron microscopy and annexin V-propidium iodide (PI) double staining flow cytometry after 12, 24 and 48 h of incubation. The activity of caspase-3 was analyzed by western blotting.
  
  
  RESULTS
  Observations under transmission electron microscopy revealed that 2 mmol/L H(2)O(2) could effectively induce lens epithelial cell apoptosis in vitro. Caspase-3 activity increased during cell apoptosis and the peak measurement occurred at 24 h after treatment with H(2)O(2). Cell apoptosis was blocked by caspase-3 inhibitor Ac-DEVD-CHO.
  
  
  CONCLUSIONS
  The activation of caspase-3 plays an important role in executing apoptosis in H(2)O(2)-treated lens epithelial cells and in the formation of cataract. The caspase-3 inhibitor Ac-DEVD-CHO may effectively prevent lens epithelial cell apoptosis caused by oxidative injury.
authors.affiliation: Department of Ophthalmology, Second Affiliated Hospital, Medical College of Zhejiang University, Hangzhou 310009, China. xlren@zju.edu.cn
authors.forename: Ke
authors.initials: K
authors.lastname: Yao
authors.forename: Kaijun
authors.initials: K
authors.lastname: Wang
authors.forename: Wen
authors.initials: W
authors.lastname: Xu
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Sun
authors.forename: Xingchao
authors.initials: X
authors.lastname: Shentu
authors.forename: Peijin
authors.initials: P
authors.lastname: Qiu
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects*; D053148:Caspase 3; D061945:Caspase Inhibitors; D020169:Caspases / Q000378:metabolism / Q000502:physiology*; D015853:Cysteine Proteinase Inhibitors / Q000494:pharmacology*; D004789:Enzyme Activation; D004847:Epithelial Cells / Q000166:cytology; D005260:Female; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D007908:Lens, Crystalline / Q000166:cytology*; D009842:Oligopeptides / Q000494:pharmacology*; D009924:Organ Culture Techniques; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D061945:Caspase Inhibitors; D015853:Cysteine Proteinase Inhibitors; D009842:Oligopeptides; C099158:acetyl-aspartyl-glutamyl-valyl-aspartal; D006861:Hydrogen Peroxide; C505410:Casp3 protein, rat; D053148:Caspase 3; D020169:Caspases