title: Acute mesenteric ischemia/reperfusion down regulates renal PGE2 synthesis.
abstract: This study examines the hypothesis that pentoxifylline protects renal PGE2 synthesis during mesenteric ischemia/reperfusion injury. Anesthetized Sprague-Dawley rats (300 g) were subjected to sham or superior mesenteric artery occlusion for 20 min followed by 30 min of reperfusion. The ischemia/reperfusion groups received either enteral allopurinol (10 mg/kg) daily for 5 d prior to ischemia, pentoxifylline (50 mg/kg) 10 min prior to ischemia or carrier. The kidney was removed and perfused in vitro with oxygenated Krebs buffer and the effluent was assayed for release of 6-keto-PGF1 alpha, PGE2 and thromboxane B2 (TXB2) by enzyme immunoassay. Mesenteric ischemia/reperfusion decreased renal PGE2 release by 50% (compared to sham) but did not alter release of TXB2 or 6-keto-PGF1 alpha. Pentoxifylline pretreatment (not allopurinol) preserved renal PGE2 release at the sham level. These data showed pentoxifylline exerted a protective effect against severe mesenteric ischemia/reperfusion injury by maintaining release of renal PGE2, a potent endogenous renal vasodilator.
authors.affiliation: Department of Surgery, University of Texas Southwestern Medical Center, Dallas.
authors.forename: S I
authors.initials: SI
authors.lastname: Myers
authors.forename: R H
authors.initials: RH
authors.lastname: Hernandez
authors.forename: J W
authors.initials: JW
authors.lastname: Horton
mesh_terms: D015121:6-Ketoprostaglandin F1 alpha / Q000378:metabolism; D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D003250:Constriction; D015232:Dinoprostone / Q000096:biosynthesis* / Q000378:metabolism; D006339:Heart Rate / Q000187:drug effects; D066298:In Vitro Techniques; D007511:Ischemia / Q000378:metabolism*; D007668:Kidney / Q000187:drug effects / Q000378:metabolism; D008297:Male; D008638:Mesenteric Arteries; D010431:Pentoxifylline / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D015424:Reperfusion; D013929:Thromboxane B2 / Q000378:metabolism
chemical_list: D013929:Thromboxane B2; D015121:6-Ketoprostaglandin F1 alpha; D015232:Dinoprostone; D010431:Pentoxifylline