title: Protective effects of ascorbic acid pretreatment in a rat model of intestinal ischemia-reperfusion injury: a histomorphometric study.
abstract: BACKGROUND
  Ascorbic acid has shown promise in attenuation of intestinal ischemia-reperfusion (I/R) injury. The aim of this study was to determine the protective effects of ascorbic acid on intestinal morphology during IR injury in rats.
  
  
  METHODS
  We examined morphological changes in the small intestine of Wistar rats after (i) 40 minutes of ischemia (I), (ii) ischemia followed by 30 min of reperfusion (IR), (iii) ischemia with ascorbic acid (IA), (iv) ischemia followed by reperfusion and ascorbic acid (IRA) and (v) in a sham group (S). We used morphometry to evaluate the amount of villous architecture, crypts, necrosis, hemorrhagic infarcts and inflammatory cells at the mesenteric and antimesenteric borders of the small intestine.
  
  
  RESULTS
  Ascorbic acid caused a significant reduction of antimesenteric villous hemorrhagic infarction (p<0.05) of the small intestine after ischemia followed by reperfusion as well as villous necrosis reduction at both borders after ischemia (p<0.05). The lesions found in the small intestine were more prominent along the antimesenteric margin.
  
  
  CONCLUSIONS
  Ascorbic acid pretreatment has a protective effect against the intestinal morphological lesions induced by ischemia-reperfusion injury in rats.
authors.affiliation: Department of Pathology, Sao Paulo University Medical School, Sao Paulo, SP, Brazil.
authors.forename: Oscar Haruo
authors.initials: OH
authors.lastname: Higa
authors.forename: Edwin Roger
authors.initials: ER
authors.lastname: Parra
authors.forename: Alexandre Muxfeldt
authors.initials: AM
authors.lastname: Ab'Saber
authors.forename: Cecilia
authors.initials: C
authors.lastname: Farhat
authors.forename: Rita
authors.initials: R
authors.lastname: Higa
authors.forename: Vera Luiza
authors.initials: VL
authors.lastname: Capelozzi
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000627:therapeutic use*; D001205:Ascorbic Acid / Q000627:therapeutic use*; D004195:Disease Models, Animal; D007421:Intestine, Small / Q000098:blood supply / Q000187:drug effects* / Q000473:pathology; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D015427:Reperfusion Injury / Q000473:pathology / Q000517:prevention & control*; D013997:Time Factors
chemical_list: D000975:Antioxidants; D001205:Ascorbic Acid