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Antioxidant and proliferative activity of the fruit extract of Lycium chinense in regenerating liver after partial hepatectomy in rats

Young Mo Ahn, Gyeong Seok Lee, Hyeon Gung Yang, Eui Gil Jung, Kook Il Han, Man Deuk Han, Wan Jong Kim

Objective: This study was carried out to evaluate the antioxidant activity and effect of a hot water extract of Lycium chinense fruit (LFE) on liver regeneration induced by Partial Hepatectomy (PH) in rats.

Methods: Antioxidant activity of LFE was determined. Rats were divided into three groups; laparotomized (sham, n=15), 70% PH (control, n=25), and LFE-treated after PH (experimental, n=35). Starting 7 days before PH, rats received DW or LFE (500 mg/kg in DW) orally once a day until sacrifice. Rats were sacrificed on d 0.5, 1, 2, 3, and 7 after surgery. Liver regeneration ratio and Proliferating Cell Nuclear Antigen (PCNA) expression were determined through immunohistochemistry and western blotting.

Results: Final extraction yield of LFE was 36.0%. LFE scavenged the DPPH and the ABTS radicals in a concentration-dependent manner. The IC₅₀ of LFE on DPPH and ABTS antioxidant activity was 5.97 mg/ml and 2.53 mg/ml, respectively. The extent of liver regeneration seen in the experimental group (91.29%) at 7 d after PH was greater than that in the control group (89.43%). After PH, the liver reconstruction process involving collapse, re-arrangement and re-modelling of hepatic tissue was observed to happen sooner in the experimental group. The number of PCNA-positive hepatocytes obviously increased in the experimental group. PCNA-positive hepatocyte ratio peaked at 2 and 3 d in the experimental and control groups, respectively.

Conclusions: Administration of LFE had beneficial effects on the regenerative capacity of remnant liver tissue after 70% PH in rats, probably owing to its antioxidant and proliferative properties.