Original Article
Copyright ©2010 Baishideng. All rights reserved
World J Gastroenterol. Jun 7, 2010; 16(21): 2657-2663
Published online Jun 7, 2010. doi: 10.3748/wjg.v16.i21.2657
Effects of blueberry on hepatic fibrosis and transcription factor Nrf2 in rats
Yu-Ping Wang, Ming-Liang Cheng, Bao-Fang Zhang, Mao Mu, Jun Wu
Yu-Ping Wang, Ming-Liang Cheng, Bao-Fang Zhang, Mao Mu, Jun Wu, Department of Infectious Diseases, Guiyang Medical College, Guiyang 550004, Guizhou Province, China
Author contributions: Cheng ML designed the research; Wang YP and Zhang BF carried out most of the experiments and wrote the article; all authors contributed to the design and interpretation of the study.
Supported by A grant from Foundation of High Level Talented Specialists of Guizhou Province, China, No. TZJF-200850; and a grant from Foundation of the Program for Tackling Key Problems of Guizhou Science and Technology Department, China, No. 2010GZ97666
Correspondence to: Ming-Liang Cheng, MD, Department of Infectious Diseases, Guiyang Medical College, Guiyang 550004, Guizhou Province, China. chengml@21cn.com
Telephone: +86-851-6752795 Fax: +86-851-6741623
Received: December 8, 2009
Revised: February 4, 2010
Accepted: February 11, 2010
Published online: June 7, 2010
Abstract

AIM: To investigate the effects of blueberry on hepatic fibrosis and NF-E2-related factor 2 (Nrf2) transcription factor in rats.

METHODS: Forty-five male Sprague-Dawley rats were randomly divided into control group (A); CCl4-induced hepatic fibrosis group (B); blueberry prevention group (C); Dan-shao-hua-xian capsule (DSHX) prevention group (D); and blueberry + DSHX prevention group (E). Liver fibrosis was induced in rats by subcutaneous injection of CCl4 and a high-lipid/low-protein diet for 8 wk (except the control group). The level of hyaluronic acid (HA) and alanine aminotransferase (ALT) in serum was examined. The activity of superoxide dismutase (SOD), glutathione-S-transferase (GST) and malondialdehyde (MDA) in liver homogenates was determined. The degree of hepatic fibrosis was evaluated by hematoxylin and eosin and Masson staining. Expression of Nrf2 and NADPH quinone oxidoreductase 1 (Nqo1) was detected by real-time reversed transcribed-polymerase chain reaction, immunohistochemical techniques, and western blotting.

RESULTS: Compared with group B, liver indices, levels of serum HA and ALT of groups C, D and E were reduced (liver indices: 0.038 ± 0.008, 0.036 ± 0.007, 0.036 ± 0.005 vs 0.054 ± 0.009, P < 0.05; HA: 502.33 ± 110.57 ng/mL, 524.25 ± 255.42 ng/mL, 499.25 ± 198.10 ng/mL vs 828.50 ± 237.83 ng/mL, P < 0.05; ALT: 149.44 ± 16.51 U/L, 136.88 ± 10.07 U/L, 127.38 ± 11.03 U/L vs 203.25 ± 31.62 U/L, P < 0.05), and SOD level was significantly higher, but MDA level was lower, in liver homogenates (SOD: 1.36 ± 0.09 U/mg, 1.42 ± 0.13 U/mg, 1.50 ± 0.15 U/mg vs 1.08 ± 0.19 U/mg, P < 0.05; MDA: 0.294 ± 0.026 nmol/mg, 0.285 ± 0.025 nmol/mg, 0.284 ± 0.028 nmol/mg vs 0.335 ± 0.056 nmol/mg, P < 0.05). Meanwhile, the stage of hepatic fibrosis was significantly weakened (P < 0.05). Compared with group A, the activity of GST liver homogenates and expression levels of Nrf2 and Nqo1 in group B were elevated (P < 0.05). The expression level of Nrf2 and Nqo1 in groups C, D, and E were increased as compared with group B, but the difference was not significant.

CONCLUSION: Blueberry has preventive and protective effects on CCl4-induced hepatic fibrosis by reducing hepatocyte injury and lipid peroxidation. However, these effects may not be related to the activation of Nrf2 during long-term of CCl4.

Keywords: Blueberry, Hepatic fibrosis, NF-E2-related factor 2, NADPH quinone oxidoreductase 1, Glutathione-S-transferase