Effects of different drainage methods on serum bile acid and hepatocyte apoptosis and regeneration after partial hepatectomy in rats with obstructive jaundice.

: The aim of this study was to investigate the mechanism of hepatocyte apoptosis and regeneration after partial hepatectomy in obstructive jaundice (OJ) rats under different drainage methods of bile acid intervention. Forty male Sprague Dawley rats were randomly divided into five groups. An OJ rat model was established by the following protocols. Seven days after obstruction, an SD rats model with 70% partial hepatectomy was established by different drainage methods of OJ. Blood and liver tissue samples were collected from rats 72 h after surgery; 72 h after partial hepatectomy (PH), the liver regeneration rate, the expression of proliferating cell nuclear antigen (PCNA) and the level of mitotic index (MI) in the internal biliary drainage (IBD) group were higher than those in external biliary drainage (EBD) group (P less than 0.05). Those in the EBD group were higher compared to the OJ group (P less than 0.05). There was no significant difference among the IBD group, EBD+CA group and (SO) sham operation group (P>0.05). Bax expressions had the same trend as AI in the five groups. The expression of Bcl-2 was increased in the IBD group and EBD+CA group, which was statistically higher compared to the SO group (P less than 0.05). In conclusion, both internal and external drainage can relieve biliary obstruction. The difference in liver regeneration caused by external drainage and internal drainage may be attributed to the destruction of bile acid enterohepatic circulation, which increases hepatocyte apoptosis and affects liver regeneration.