title: Protective effect of melatonin on liver ischemia-reperfusion induced pulmonary microvascular injury in rats.
abstract: OBJECTIVE
  Reactive oxygen species generated during liver reperfusion have been implicated in remote lung injury. In this study, we evaluate the protective effects of melatonin pretreatment against the increased pulmonary microvascular permeability.
  
  
  METHODS
  Male Sprague-Dawley rats were divided into three groups: shame-operated, liver ischemia-reperfusion (I/R), and melatonin pretreated (15 mg/kg, intraperitoneally) 15 minutes prior to the liver I/R). The duration of ischemia was 30 minutes, followed by 2 hours of reperfusion. Lungs were isolated in situ and parameters of the capillary filtration coefficient (K(fc)), lung wet-to-dry weight ratio (W/D), lung weight-to-body weight (LW/BW), and protein concentration in bronchial lavage fluid (PCBAL), the percentage of macrophages and neutrophils in bronchial lavage fluid (BALF), and lung tissue malonedealdehyde were used to assess the lung injury.
  
  
  RESULTS
  Liver I/R-induced lung injury was noted by the markedly increased K(fc), W/D, LW/BW, PCBAL, and the presence of neutrophils and macrophages in BALF. Lipid peroxidation was also increased (P < .05). All indicators were markedly decreased in melatonin-pretreated rats (P < .05), suggesting that lung injury was attenuated.
  
  
  CONCLUSIONS
  Melatonin pretreatment prior to liver I/R can effectively reduce the pulmonary microvascular permeability and attenuate lipid peroxidation in the lungs.
authors.affiliation: Chest Department, Cathay General Hospital, Taipei, Taiwan.
authors.forename: M-H
authors.initials: MH
authors.lastname: Chiu
authors.forename: C-L
authors.initials: CL
authors.lastname: Su
authors.forename: C-F
authors.initials: CF
authors.lastname: Chen
authors.forename: K-H
authors.initials: KH
authors.lastname: Chen
authors.forename: D
authors.initials: D
authors.lastname: Wang
authors.forename: J-J
authors.initials: JJ
authors.lastname: Wang
mesh_terms: D055371:Acute Lung Injury / Q000209:etiology / Q000378:metabolism / Q000473:pathology / Q000517:prevention & control*; D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D002199:Capillary Permeability / Q000187:drug effects; D019610:Cytoprotection; D004195:Disease Models, Animal; D015227:Lipid Peroxidation / Q000187:drug effects; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D008107:Liver Diseases / Q000150:complications / Q000188:drug therapy* / Q000378:metabolism; D008168:Lung / Q000098:blood supply* / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D008264:Macrophages / Q000187:drug effects / Q000473:pathology; D008297:Male; D008315:Malondialdehyde / Q000378:metabolism; D008550:Melatonin / Q000494:pharmacology*; D055806:Microvessels / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D020556:Neutrophil Infiltration / Q000187:drug effects; D018384:Oxidative Stress / Q000187:drug effects; D011654:Pulmonary Edema / Q000209:etiology / Q000517:prevention & control; D051381:Rats; D017207:Rats, Sprague-Dawley; D015427:Reperfusion Injury / Q000150:complications / Q000188:drug therapy* / Q000378:metabolism
chemical_list: D000975:Antioxidants; D008315:Malondialdehyde; D008550:Melatonin