Comparing animal well-being between bile duct ligation models

Area of Science:

• Hepatology and Gastroenterology
• Animal Models of Disease
• Surgical Pathology

Background:

• The common bile duct ligation (cBDL) is a standard animal model for obstructive cholestasis and related liver diseases.
• Modifications like partial bile duct ligation (pBDL) and pBDL with arterial ligation (pBDL+pAL) create localized cholestasis.
• Evaluating and comparing these models is crucial for accurate disease research.

Purpose of the Study:

• To compare the pathological features, animal well-being, and survival rates of pBDL and pBDL+pAL models against the established cBDL model.
• To determine the suitability of pBDL for studying specific aspects of cholestasis, such as inflammation and fibrosis.

Main Methods:

• Induction of cholestasis in mice using cBDL, pBDL, or pBDL+pAL surgical procedures.
• Assessment of animal well-being through burrowing behavior, body weight, and distress scores.
• Analysis of plasma liver enzymes, bile acids, bilirubin, and liver tissue for necrosis, fibrosis, inflammation, and gene expression.

Main Results:

• pBDL and pBDL+pAL showed comparable survival and well-being, but pBDL+pAL induced more severe necrosis and collagen deposition.
• pBDL resulted in focal necrosis and fibrosis, with significantly higher survival and improved well-being compared to cBDL.
• cBDL elevated multiple liver enzymes and bilirubin, while pBDL primarily increased glutamate dehydrogenase activity.

Conclusions:

• The pBDL model offers improved animal welfare and survival, making it advantageous over cBDL for certain liver disease research.
• pBDL is well-suited for investigating local liver inflammation, fibrosis, and bile acid-related gene expression.
• pBDL may not fully recapitulate the systemic features of cholestasis observed in the cBDL model.