title: The effects of dexmedetomidine on liver ischemia-reperfusion injury in rats.
abstract: BACKGROUND
  Ischemia-reperfusion (IR) injury of the liver may cause various types of damage to hepatic tissues. It can affect the prognosis of patients and the success of an operation. Dexmedetomidine is a selective α2 receptor agonist. We investigated whether dexmedetomidine provides protection against IR-induced liver injury in rats.
  
  
  METHODS
  Forty rats were divided equally into four groups. In group 1, the liver was manipulated after the laparotomy, and no occlusion of the vessels of the liver was performed. In group 2, once the abdomen was opened, 60 min of ischemia and 60 min of reperfusion were applied according to the segmental hepatic ischemia model. In group 3, 10 μg/kg of dexmedetomidine was injected into the peritoneal cavity 30 min before ischemia. In group 4, 100 μg/kg of dexmedetomidine was injected into the peritoneal cavity 30 min before ischemia. Further procedures in groups 3 and 4 were the same as those of group 2. After the experiment was completed, the rats were killed. Liver tissues were removed and stored until biochemical and histologic assessments were performed.
  
  
  RESULTS
  The malondialdehyde level in group 2 was higher than that of groups 1, 3, and 4 (P = 0.001, P = 0.000, and P = 0.000, respectively). Superoxide dismutase, catalase, and glutathione levels in group 2 were lower than those in group 1 (P = 0.001, P = 0.027, and P = 0.014, respectively). Superoxide dismutase and catalase levels in group 4 were higher than those in group 2 (P = 0.002 and P = 0.000, respectively). GSH levels in groups 3 and 4 were higher than those in group 2 (P = 0.049 and P = 0.006, respectively). A lower glutathione peroxidase level was detected in groups 2 and 3 than that in group 1 (P = 000). Group 4 demonstrated an increase in glutathione peroxidase levels compared with group 3 (P = 0.014). The histologic injury scores in groups 2-4 were higher than those in group 1 (P = 0.003, P = 0.002, and P = 0.001, respectively). However, the histologic injury scores were lower in groups 3 and 4 than those in group 2 (P = 0.003 and P = 0.002, respectively).
  
  
  CONCLUSIONS
  This study showed that dexmedetomidine may protect the liver against IR injury in rats.
authors: Department of Anesthesiology and Reanimation, Inonu University Medical Faculty, Malatya, Turkey.
authors: Taylan
authors: T
authors: Sahin
authors: Zekine
authors: Z
authors: Begeç
authors: Hüseyin İ
authors: Hİ
authors: Toprak
authors: Alaadin
authors: A
authors: Polat
authors: Nigar
authors: N
authors: Vardi
authors: Aytaç
authors: A
authors: Yücel
authors: Mahmut
authors: M
authors: Durmuş
authors: Mehmet Ö
authors: MÖ
authors: Ersoy
mesh_terms: D058647:Adrenergic alpha-2 Receptor Agonists / Q000494:pharmacology / Q000627:therapeutic use*; D000818:Animals; D020927:Dexmedetomidine / Q000494:pharmacology / Q000627:therapeutic use*; D004353:Drug Evaluation, Preclinical; D008099:Liver / Q000098:blood supply / Q000473:pathology; D008107:Liver Diseases / Q000473:pathology / Q000517:prevention & control*; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D015427:Reperfusion Injury / Q000150:complications / Q000473:pathology / Q000517:prevention & control*
chemical_list: D058647:Adrenergic alpha-2 Receptor Agonists; D020927:Dexmedetomidine