Sepsis-associated cholestasis is critically dependent on P-selectin-dependent leukocyte recruitment in mice.
Cholestasis is a major complication in sepsis although the underlying mechanisms remain elusive. The aim of this study was to evaluate the role of P-selectin and leukocyte recruitment in endotoxemia-associated cholestasis. C57BL/6 mice were challenged intraperitoneally with endotoxin (0.4 mg/kg), and 6 h later the common bile duct was cannulated for determination of bile flow and biliary excretion of bromosulfophthalein. Mice were pretreated with an anti-P-selectin antibody or an isotype-matched control antibody. Leukocyte infiltration was determined by measuring hepatic levels of myeloperoxidase. Tumor necrosis factor-alpha and CXC chemokines in the liver was determined by ELISA. Liver damage was monitored by measuring serum levels of alanine aminotransferase and aspartate aminotransferase. Apoptosis was quantified morphologically by nuclear condensation and fragmentation using Hoechst 33342 staining. Endotoxin induced a significant inflammatory response with increased TNF-alpha and CXC chemokine concentrations, leukocyte infiltration, liver enzyme release, and apoptotic cell death. This response was associated with pronounced cholestasis indicated by a >70% decrease of bile flow and biliary excretion of bromosulfophthalein. Immunoneutralization of P-selectin significantly attenuated endotoxin-induced leukocyte infiltration reflected by a >60% reduction of hepatic myeloperoxidase levels. Interference with P-selectin decreased endotoxin-mediated hepatocellular apoptosis and necrosis, but did not affect hepatic levels of tumor necrosis factor-alpha and CXC chemokines. Of interest, inhibition of P-selectin restored bile flow and biliary excretion of bromosulfophthalein to normal levels in endotoxin-challenged animals. Our study demonstrates for the first time that P-selectin-mediated recruitment of leukocytes, but not the local production of proinflammatory mediators, is the primary cause of cholestasis in septic liver injury.
Laschke
Matthias W
MW
Dept. of Surgery, Malmö Univ. Hospital, Lund Univ., S-205 02 Malmö, Sweden.
Menger
Michael D
MD
Wang
Yusheng
Y
Lindell
Gert
G
Jeppsson
Bengt
B
Thorlacius
Henrik
H
D000074020:ATP Binding Cassette Transporter, Subfamily B, Member 11; D018528:ATP-Binding Cassette Transporters / Q000096:biosynthesis; D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D056486:Chemical and Drug Induced Liver Injury / Q000503:physiopathology; D054426:Chemokine CXCL2; D018925:Chemokines / Q000096:biosynthesis; D019743:Chemokines, CXC / Q000096:biosynthesis; D002634:Chemotaxis, Leukocyte / Q000502:physiology*; D002779:Cholestasis / Q000209:etiology*; D004731:Endotoxins; D008070:Lipopolysaccharides / Q000494:pharmacology; D008099:Liver / Q000473:pathology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D027361:Organic Anion Transporters / Q000096:biosynthesis; D019007:P-Selectin / Q000276:immunology / Q000502:physiology*; D009195:Peroxidase / Q000378:metabolism; D018805:Sepsis / Q000150:complications*; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis
D000074020:ATP Binding Cassette Transporter, Subfamily B, Member 11; D018528:ATP-Binding Cassette Transporters; C490549:Abcb11 protein, mouse; D054426:Chemokine CXCL2; D018925:Chemokines; D019743:Chemokines, CXC; C404915:Cxcl2 protein, mouse; D004731:Endotoxins; D008070:Lipopolysaccharides; D027361:Organic Anion Transporters; D019007:P-Selectin; D014409:Tumor Necrosis Factor-alpha; D009195:Peroxidase