J Cancer Prev.  2015 Jun;20(2):136-146. 10.15430/JCP.2015.20.2.136.

The Sasa quelpaertensis Leaf Extract Inhibits the Dextran Sulfate Sodium-induced Mouse Colitis Through Modulation of Antioxidant Enzyme Expression

• Yeom Y
• Kim Y

• KMID: 2171339
• DOI: http://doi.org/10.15430/JCP.2015.20.2.136

Abstract

BACKGROUND
Oxidative stress plays an important role in the pathogenesis of inflammatory bowel disease. The objective of this study is to investigate the protective effect of Sasa quelpaertensis leaf extract (SQE) against oxidative stress in mice with dextran sulfate sodium (DSS)-induced colitis.
METHODS
Mice were treated with SQE (100 mg/kg or 300 mg/kg body weight) by gavage in advance two weeks before inflammation was induced. Then, the mice were administered with 2.5% DSS in drinking water for 7 days and normal drinking water for 7 days between two DSS treatment. Disease activity index values, gut motility, and severity of the resulting oxidative DNA damage were analyzed. The antioxidant effect of SQE was evaluated by measuring malondialdehyde (MDA) and superoxide dismutase (SOD) activity in plasma samples. Catalase activity and expressions levels of glutathione peroxidase 1 (Gpx1), SOD1, and SOD2 were also detected in colon tissues.
RESULTS
Administration of SQE significantly reduced the severity of DSS-induced colitis compared to the control (Ctrl) group. Levels of 8-oxo-dG, an oxidative DNA damage marker, were significantly lower in the SQE group compared to the untreated DSS Ctrl group. In the SQE (300 mg/kg) group, MDA levels were significantly lower, while SOD and catalase activity levels in the plasma samples were significantly higher compared with the DSS Ctrl group. The expression levels of the antioxidant enzymes, SOD2 and Gpx1, were significantly higher, while the levels of SOD 1 expression were lower, in the colon tissues of the DSS Ctrl group compared with those of the Ctrl group. In contrast, administration of SQE significantly down-regulated SOD2 and Gpx1 expressions and up-regulated SOD1 expression.
CONCLUSIONS
These results indicate that SQE efficiently suppresses oxidative stress in DSS-induced colitis in mice, and its action is associated with the regulation of antioxidant enzymes.

Keyword

Sasa quelpaertensis leaf; Dextran sulfate; Colitis; Antioxidant

MeSH Terms

Animals
Antioxidants
Catalase
Colitis*
Colon
Dextran Sulfate*
Dextrans*
DNA Damage
Drinking Water
Glutathione Peroxidase
Inflammation
Inflammatory Bowel Diseases
Malondialdehyde
Mice*
Oxidative Stress
Plasma
Sasa*
Superoxide Dismutase
Antioxidants
Catalase
Dextran Sulfate
Dextrans
Drinking Water
Glutathione Peroxidase
Malondialdehyde
Superoxide Dismutase