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Sphallerocarpus gracilis polysaccharide protects pancreatic β-cells via regulation of the bax/bcl-2, caspase-3, pdx-1 and insulin signalling pathways.
International Journal of Biological Macromolecules 2016 December
In this study, the structural characterization of Sphallerocarpus gracilis polysaccharide (SGP) and its hypoglycaemic activities are reported for the first time. SGP, which has a weight average molar mass (Mw) of 7.413×10(5), was isolated from Sphallerocarpus gracilis and purified by ion-exchange chromatography. The polysaccharide is composed of rhamnose, arabinose, mannose, glucose and galactose, with the molar ratio of 4.12: 8.99: 5.45: 65.94: 15.50. The mechanism underlying the hypoglycaemic effect of SGP was evaluated. Experimental results showed that SGP protected pancreatic β-cells from alloxan damage by several possible mechanisms, including: (1) repairing free radical damage; (2) reducing the apoptosis of pancreatic β-cells by inhibiting the activities of caspase-3 and bax, and enhancing the activity of bcl-2; (3) stimulating insulin secretion and upregulating the pancreatic and duodenal homeobox 1 gene and the insulin gene and the pancreatic in pancreatic β-cells. The results obtained in this study suggest that SGP may be a promising therapeutic agent in the treatment of diabetes mellitus.
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