Background/Aims: The impact of pegylated-interferon (PEG-IFN) α-2b on liver regeneration has not yet been elucidated. Methodology: Rats were divided into the following four groups: 70% hepatectomy (Hx); 70% Hx+PEG-IFN; 90% Hx and 90% Hx+PEG-IFN group (n=6 each). Rats were pretreated with subcutaneous of PEG-IFN αa-2b (1.5μg/kg) administration 24 hours before Hx. Samples were taken 24, 48 and 72 hours after Hx and the following parameters were investigated: blood analysis (AST, WBC, PLT); liver weight to body weight ratio (Lw/Bw ratio); survival and PCNA labeling index (LI). Results: In the 90% Hx model, there was no significant difference between the Hx+PEG-IFN group and the Hx alone group in blood analysis; AST after postoperative 24 hours (2511 vs. 2466IU/L), WBC (1200 vs. 1290) and PLT (107 vs. 111 × 10 4/mm3), in Lw/Bw ratio at postoperative 0, 24, 48, 72 hours, respectively (0.38, 0.60, 1.14, 1.69 vs. 0.37, 0.64, 1.12, 1.63), in postoperative survival (40% vs. 45%), and in PCNA LI at postoperative 0, 24, 48, 72 hours, respectively (10.4%, 16.8%, 14.6%, 12.8% vs. 10.0%, 17.1%, 15.6%, 13.7%). In the 70% Hx model, there was no significant difference between the Hx+PEG-IFN group and the Hx alone group for all parameters. Conclusions: Our data demonstrated that PEG-IFN α-2b did not affect liver regeneration and the early use of PEG-IFN α-2b would cause no problems after liver transplantation using partial grafts including living donor liver transplantation.
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