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Section of Neonatology, Department of Pediatrics, Rush Children's Hospital, Rush Presbyterian St. Luke's Medical Center, Chicago, Illinois 60612
Using a nonstressed
chronically catheterized rat model in which the common bile duct was
cannulated, we studied endotoxin-induced alterations in hepatic
function by measuring changes in the maximal steady-state biliary
excretion rate of the anionic dye indocyanine green (ICG). Biliary
excretion of ICG was calculated from direct measurements of biliary ICG
concentrations and the bile flow rate during a continuous vascular
infusion of ICG. Despite significant elevations in mean peak serum
tumor necrosis factor-
(TNF-
) concentrations (90.9 ± 16.2 ng/ml), there was no effect on mean rates of bile flow or biliary ICG
clearance after administration of 100 µg/kg endotoxin at 6 or 24 h. Significant differences from mean baseline rates of bile flow and
biliary ICG excretion did occur after administration of 1,000 µg/kg
endotoxin (mean peak TNF-
129.6 ± 24.4 ng/ml). Furthermore,
when rats were treated with up to 16 µg/kg of recombinant TNF-
,
there was no change in mean rates of bile flow or ICG biliary clearance
compared with baseline values. These data suggest that the complex
regulation of biliary excretion is not mediated solely by TNF-
.
tumor necrosis factor-
; hepatocellular dysfunction; sepsis; cholestasis; in vivo studies
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