期刊
FOOD AND CHEMICAL TOXICOLOGY
卷 131, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.fct.2019.05.047
关键词
Bletilla striata polysaccharides; Gastric injury; Oxidative stress; MAPK/ NF-kappa B pathway
资金
- National Natural Science Foundation of China (NSFC) [81373987, 81603309]
- Young Elite Scientists Sponsorship Program by CAST [2018QNRC001]
- Program for Excellent Talents in Chengdu University of Traditional Chinese Medicine
The chemical characterization and protective role against ethanol-induced gastric ulcerated rats of a polysaccharide fraction from Bletilla striata (BSP) collected by ultrafiltration membrane approach were evaluated. This BSP faction was consisted of mannose and glucose at a molar ratio of 2.4:1 approximately, with a molecular weight of 146 KDa. FT-IR, NMR and XRD spectra indicated that BSP faction contained alpha-Man and beta-Glc residues with low overall crystallinity. The polysaccharide exhibited significant scavenging activities of ABTS and FRAP, as well as non-toxicity against human gastric epithelial GES-1 cells. Oral administration with 100 mg/kg of BSP for 3 days continuously could significantly prevent the formation of ethanol-induced gastric mucosal lesion. It could also reduce the levels of pro-inflammatory cytokines, including TNF-alpha, IL-1 beta, IL-6, and IL-18, and MPO activity in gastric tissue. Additionally, the BSP faction exhibited antioxidant activity, increased the content of PEG(2) as a defensive factor, and suppressed MAPK/NF-kappa B signaling pathway in gastric tissue. These results indicated that the gastroprotective activity of BSP faction could be attributed to the reduction of pro-inflammatory cytokines and oxidative stress and the inhibition of MAPK/NF-kappa B pathways. Our results provided substantial evidence that BSP could be a promising phytomedicine for gastric ulcer prevention.
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