title: Cyclooxygenase 1 and/or 2 blockade ameliorates the renal tissue damage triggered by ischemia and reperfusion injury.
abstract: Ischemia-reperfusion injury (IRI) is a common event in organ transplantation, being implicated as a potential contributor for the development of chronic allograft nephropathy. There are new evidences showing a tissue inflammatory response following renal IRI. Cyclooxygenases (COX) 1 and 2 can be detected in tissue submitted to IRI and may have impact on organ function outcome. We evaluated the role of COX inhibition on the renal tissue damage that follows IRI. Mice were submitted to 45 min of renal pedicle ligature and allowed to reperfuse for 24, 48, 72 and 120 h. Blood and kidney samples were collected at reperfusion times. mRNA was extracted from the kidney samples to amplify COX-1, COX-2 and beta-actin genes. Animals were pretreated with indomethacin or rofecoxib before the surgery. Indomethacin treatment induced a better renal function (serum urea) when compared to control animals at 24, 48 and 72 h (219+/-54.5 vs. 338+/-51 mg/dl; 106+/-51 vs. 326+/-86 mg/dl; 94+/-14 vs. 138+/-38 mg/dl, respectively). Surprisingly, rofecoxib use was associated with even better renal improvement following IR. Animals treated with the later drug showed lower urea values at 24 h post reperfusion compared to indomethacin-treated animals (128+/-33 vs. 219+/-54.5 mg/dl, P<0.05). Blockade of COX-1 and -2 resulted in a decrease of tubular necrosis. mRNA COX-2 was up-regulated post IRI and considerable inhibited after indomethacin or rofecoxib treatment. Our data show COX-1/-2 participates in the inflammatory tissue response to IR injury and its inhibition is associated with an improvement in renal function.
authors.affiliation: Laboratory of Clinical and Experimental Immunology, Departamento de Medicina, Disciplina de Nefrologia, Hospital do Rim e Hipertensão, Universidade Federal de São Paulo, Rua Botucatu 740, Vila Clementino, 04023-900, São Paulo, Brazil.
authors.forename: Carla Q
authors.initials: CQ
authors.lastname: Feitoza
authors.forename: Niels O S
authors.initials: NO
authors.lastname: Câmara
authors.forename: Hélady S
authors.initials: HS
authors.lastname: Pinheiro
authors.forename: Giselle M
authors.initials: GM
authors.lastname: Gonçalves
authors.forename: Marcos A
authors.initials: MA
authors.lastname: Cenedeze
authors.forename: Alvaro
authors.initials: A
authors.lastname: Pacheco-Silva
authors.forename: Oscar F P
authors.initials: OF
authors.lastname: Santos
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors / Q000494:pharmacology*; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D007213:Indomethacin / Q000494:pharmacology; D007511:Ischemia / Q000378:metabolism* / Q000503:physiopathology; D007668:Kidney / Q000098:blood supply* / Q000187:drug effects* / Q000503:physiopathology; D007783:Lactones / Q000494:pharmacology; D008297:Male; D008565:Membrane Proteins; D051379:Mice; D008810:Mice, Inbred C57BL; D011451:Prostaglandin-Endoperoxide Synthases / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000096:biosynthesis; D015427:Reperfusion Injury / Q000378:metabolism* / Q000503:physiopathology; D013450:Sulfones / Q000494:pharmacology
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors; D007783:Lactones; D008565:Membrane Proteins; D012333:RNA, Messenger; D013450:Sulfones; C116926:rofecoxib; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D011451:Prostaglandin-Endoperoxide Synthases; C496512:Ptgs1 protein, mouse; D007213:Indomethacin