title: Endothelin receptor antagonism by tezosentan attenuates lung injury induced by aortic ischemia-reperfusion.
abstract: Tezosentan is a novel dual endothelin receptor antagonist. The purpose of this study was to examine the effect of tezosentan on lung injury induced by abdominal aortic ischemia-reperfusion (IR) in rats. Thirty-two Wistar-albino rats were randomized into four groups (eight per group) as follows: control group (sham laparotomy), aortic IR group (120 min ischemia and 120 min reperfusion), aortic IR + tezosentan group (a bolus intravenous injection of 10 mg/kg tezosentan before ischemia plus continuous intravenous infusion of 1 mg/kg/hr tezosentan during 120 min ischemia and 120 min reperfusion), and control + tezosentan. Blood and lung tissue samples were obtained for biochemical analysis. Protein concentrations in bronchoalveolar lavage fluid and lung wet/dry weight ratios were measured. A histological evaluation was also done. Aortic IR significantly increased (p < 0.05 vs. control group) and tezosentan significantly decreased (p < 0.05 vs. aortic IR group) the plasma level of tumor necrosis factor-alpha; lung tissue levels of malondialdehyde, catalase, and myleperoxidase; and protein concentration in bronchoalveolar lavage fluid and lung wet/dry weight ratio. Histological evaluation showed that tezosentan attenuated the morphological changes associated with lung injury. The results of this study indicate that tezosentan attenuates lung injury induced by aortic IR in rats. We propose that this protective effect of tezosentan is due to (1) reduced systemic inflammatory response, (2) reduced oxidative stress and lipid peroxidation in lung tissue, (3) reduced pulmonary microvascular leakage, and (4) inhibition of leukocyte infiltration into lung tissue.
authors.affiliation: Department of Cardiovascular Surgery, Süleyman Demirel University Medical School, Isparta, Turkey. kirisilker@yahoo.com
authors.forename: Ilker
authors.initials: I
authors.lastname: Kiriş
authors.forename: Cüneyt
authors.initials: C
authors.lastname: Narin
authors.forename: Senol
authors.initials: S
authors.lastname: Gülmen
authors.forename: Nigar
authors.initials: N
authors.lastname: Yilmaz
authors.forename: Recep
authors.initials: R
authors.lastname: Sütçü
authors.forename: Nilgün
authors.initials: N
authors.lastname: Kapucuoğlu
mesh_terms: D000818:Animals; D001012:Aorta, Abdominal / Q000601:surgery; D001992:Bronchoalveolar Lavage Fluid / Q000737:chemistry; D002199:Capillary Permeability / Q000187:drug effects; D002634:Chemotaxis, Leukocyte / Q000187:drug effects; D003250:Constriction; D004195:Disease Models, Animal; D004334:Drug Administration Schedule; D065128:Endothelin Receptor Antagonists; D019332:Endothelin-1 / Q000097:blood; D005260:Female; D007262:Infusions, Intravenous; D007275:Injections, Intravenous; D053583:Interleukin-1beta / Q000097:blood; D015227:Lipid Peroxidation / Q000187:drug effects; D008168:Lung / Q000098:blood supply / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D055370:Lung Injury / Q000378:metabolism / Q000473:pathology / Q000517:prevention & control*; D008297:Male; D008315:Malondialdehyde / Q000378:metabolism; D018384:Oxidative Stress / Q000187:drug effects; D009195:Peroxidase / Q000378:metabolism; D011725:Pyridines / Q000008:administration & dosage*; D051381:Rats; D017208:Rats, Wistar; D017466:Receptors, Endothelin / Q000378:metabolism; D015427:Reperfusion Injury / Q000378:metabolism / Q000473:pathology / Q000517:prevention & control*; D013482:Superoxide Dismutase / Q000378:metabolism; D018746:Systemic Inflammatory Response Syndrome / Q000378:metabolism / Q000473:pathology / Q000517:prevention & control; D013777:Tetrazoles / Q000008:administration & dosage*; D014409:Tumor Necrosis Factor-alpha / Q000097:blood
chemical_list: D065128:Endothelin Receptor Antagonists; D019332:Endothelin-1; D053583:Interleukin-1beta; D011725:Pyridines; D017466:Receptors, Endothelin; D013777:Tetrazoles; D014409:Tumor Necrosis Factor-alpha; D008315:Malondialdehyde; C120582:tezosentan; D009195:Peroxidase; D013482:Superoxide Dismutase