title: Acute cholestatic liver disease protects against glycerol-induced acute renal failure in the rat.
abstract: BACKGROUND
  It is widely held that liver disease predisposes toward acute tubular necrosis. The present study examines the effect of acute cholestatic liver disease on the susceptibility to glycerol-induced acute tubular necrosis in the rat.
  
  
  METHODS
  Acute cholestatic liver disease was induced by ligation of the common bile duct, while the intramuscular injection of hypertonic glycerol was used to induce acute tubular necrosis. Renal injury was assessed by plasma creatinine concentration and renal histology. An in vitro model of heme protein-induced renal injury (hemoglobin in conjunction with glutathione depletion) was employed to assess the cytoprotective effects of bilirubin.
  
  
  RESULTS
  Ligation of the common bile duct markedly reduced acute renal injury that occurs in the glycerol model (7.5 mL/kg body weight), as evidenced by a lower plasma creatinine concentration and less severe renal histologic injury. At a higher dose of glycerol (10 mL/kg body weight), ligation of the common bile duct again reduced renal injury and cumulative mortality that occurs five days after the induction of this model of acute renal failure. These protective effects of ligation of the common bile duct could not be ascribed to less severe muscle injury or red cell damage. Ligation of the common bile duct induced heme oxygenase-1 in the kidney and markedly so in the liver. Inhibition of heme oxygenase significantly attenuated, but did not prevent, the protective effects conferred by ligation of the common bile duct. Bilirubin, in low micromolar concentrations, was cytoprotective against heme protein-induced cell injury in vitro.
  
  
  CONCLUSIONS
  Ligation of the common bile duct confers resistance to glycerol-induced acute tubular necrosis in the rat, actions that arise, in part, from the induction of heme oxygenase-1 in the kidney and liver. Bilirubin, in micromolar concentrations, protects against heme protein-induced renal injury. Our studies uncover a novel form of acquired resistance to renal injury, occurring, unexpectedly, in the setting of acute cholestatic liver disease. We speculate that such potentially cytoprotective alterations may safeguard the kidney against irreversible functional and structural injury in the hepatorenal syndrome.
authors.affiliation: Department of Nephrology and Pathology, Mayo Clinic/Foundation, Rochester, Minnesota 55905, USA.
authors.forename: N
authors.initials: N
authors.lastname: Leung
authors.forename: A J
authors.initials: AJ
authors.lastname: Croatt
authors.forename: J J
authors.initials: JJ
authors.lastname: Haggard
authors.forename: J P
authors.initials: JP
authors.lastname: Grande
authors.forename: K A
authors.initials: KA
authors.lastname: Nath
mesh_terms: D058186:Acute Kidney Injury / Q000209:etiology / Q000517:prevention & control*; D000818:Animals; D002780:Cholestasis, Intrahepatic / Q000097:blood / Q000503:physiopathology*; D003404:Creatinine / Q000097:blood; D004195:Disease Models, Animal; D005990:Glycerol; D006419:Heme Oxygenase (Decyclizing) / Q000096:biosynthesis; D051547:Heme Oxygenase-1; D006530:Hepatorenal Syndrome / Q000503:physiopathology*; D007683:Kidney Tubular Necrosis, Acute / Q000150:complications; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D003404:Creatinine; D006419:Heme Oxygenase (Decyclizing); D051547:Heme Oxygenase-1; D005990:Glycerol