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Molecules 2016, 21(2), 174; doi:10.3390/molecules21020174

Antioxidant and DNA Damage Protecting Activity of Exopolysaccharides from the Endophytic Bacterium Bacillus cereus SZ1

1
Department of Horticulture, School of Architecture, Soochow University, Suzhou 215123, China
2
College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China
3
School of Biology & Basic Medical Sciences, Soochow University, Suzhou 215123, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Received: 25 December 2015 / Revised: 25 January 2016 / Accepted: 27 January 2016 / Published: 4 February 2016
(This article belongs to the Section Natural Products)
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Abstract

An endophytic bacterium was isolated from the Chinese medicinal plant Artemisia annua L. The phylogenetic and physiological characterization indicated that the isolate, strain SZ-1, was Bacillus cereus. The endophyte could produce an exopolysaccharide (EPS) at 46 mg/L. The 1,1-diphenyl-2-picrylhydracyl (DPPH) radical scavenging activity of the EPS reached more than 50% at 3–5 mg/mL. The EPS was also effective in scavenging superoxide radical in a concentration dependent fashion with an EC50 value of 2.6 mg/mL. The corresponding EC50 for scavenging hydroxyl radical was 3.1 mg/mL. Moreover, phenanthroline-copper complex-mediated chemiluminescent emission of DNA damage was both inhibited and delayed by EPS. The EPS at 0.7–1.7 mg/mL also protected supercoiled DNA strands in plasmid pBR322 against scission induced by Fenton-mediated hydroxyl radical. The preincubation of PC12 cells with the EPS prior to H2O2 exposure increased the cell survival and glutathione (GSH) level and catalase (CAT) activities, and decreased the level of malondialdehyde (MDA) and lactate dehydrogenase (LDH) activity in a dose-dependent manner, suggesting a pronounced protective effect against H2O2-induced cytotoxicity. Our study indicated that the EPS could be useful for preventing oxidative DNA damage and cellular oxidation in pharmaceutical and food industries. View Full-Text
Keywords: Artemisia annua L.; Bacillus cereus; exopolysaccharide; radical scavenging activity; oxidative damage Artemisia annua L.; Bacillus cereus; exopolysaccharide; radical scavenging activity; oxidative damage
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MDPI and ACS Style

Zheng, L.P.; Zou, T.; Ma, Y.J.; Wang, J.W.; Zhang, Y.Q. Antioxidant and DNA Damage Protecting Activity of Exopolysaccharides from the Endophytic Bacterium Bacillus cereus SZ1. Molecules 2016, 21, 174.

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