Single versus double experimental bile duct ligation model for inducing bacterial translocation

Area of Science:

• Gastroenterology
• Hepatology
• Surgical Research

Background:

• Bacterial translocation is linked to liver damage severity.
• The double common bile duct ligation and section technique in rats is a known model for bacterial translocation.
• The validity of simpler surgical variants for modeling bacterial translocation requires investigation.

Purpose of the Study:

• To evaluate a simplified bile duct ligation technique as a model for bacterial translocation.
• To compare bacterial translocation incidence between simple and double bile duct ligation models.
• To assess the development of liver damage and portal hypertension in response to different ligation techniques.

Main Methods:

• Fifty-six rats underwent either simple bile duct ligation (SBL), double bile duct ligation and section (DBDL), or a sham operation.
• Bacterial translocation was assessed via cultures of mesenteric lymph nodes, blood, spleen, and liver.
• Stool cultures and liver histology were performed to evaluate bacterial translocation and liver damage.

Main Results:

• Bacterial translocation incidence was comparable between SBL (23.5%) and DBDL (25%) groups.
• Mortality rates were similar for both ligation methods.
• DBDL induced liver cirrhosis in all rats by 4 weeks and portal hypertension by week 3; SBL did not cause cirrhosis or portal hypertension.

Conclusions:

• Simple bile duct ligation serves as a valid model for studying bacterial translocation.
• The SBL model offers a comparable incidence of bacterial translocation to DBDL.
• Crucially, SBL avoids the development of severe liver pathology like cirrhosis and portal hypertension observed in the DBDL model.