A subacute rabbit model for hepatobiliary dysfunction during total parenteral nutrition

Area of Science:

• Pediatric Gastroenterology
• Hepatology
• Nutritional Support

Background:

• Total parenteral nutrition (TPN) is linked to cholestasis and cholelithiasis in children.
• The exact causes of these TPN-associated hepatobiliary complications remain unclear.
• Gastrointestinal hypomotility during enteral fasting is a potential contributing factor.

Purpose of the Study:

• To investigate the role of gastrointestinal hypomotility in TPN-associated hepatobiliary dysfunction.
• To compare TPN-fed rabbits with controls regarding gastrointestinal transit and bile composition.

Main Methods:

• Weanling rabbits were maintained on TPN or fed chow (pair-fed and free-fed controls) for 10 days.
• Gastrointestinal transit time was measured using a solid marker technique.
• Bacterial flora, bile composition, and serum markers of hepatic dysfunction were analyzed.

Main Results:

• TPN-treated rabbits exhibited significantly longer gastrointestinal transit times.
• Gallbladder bile showed increased lithocholic acid, unconjugated bilirubin, and calcium in TPN-treated animals.
• Elevated hepatic dysfunction markers and mild liver steatosis/edema were observed in TPN-treated rabbits.

Conclusions:

• Gastrointestinal hypomotility associated with enteral fasting contributes to TPN-induced hepatobiliary dysfunction.
• Increased lithocholic acid concentration in bile may mediate these pathophysiologic changes.
• This study highlights a mechanism for TPN-related liver and gallbladder issues.