Effect Of Water-soluble Polysaccharides Research Articles

Effect of water-soluble polysaccharides from Morchella esculenta on high-fat diet-induced obese mice: changes in gut microbiota and metabolic functions.

Morchella esculenta polysaccharides exhibit numerous probiotic activities, but their regulatory effects on the gut microbiota are unclear. This study was conducted to explore whether M. esculenta polysaccharides can regulate dysbacteriosis caused by a high-fat diet and relieve obesity. We extracted a water-soluble polysaccharide from M. esculenta (MPF, purity: 96.19%, consisting of 55.97% glucose, 9.63% xylose, and 22% mannose) that reduces mouse fat accumulation, alleviates obesity, and relieves liver injury, after 90 days of high-fat diet intake. This polysaccharide reversed dysbiosis and regulated the abundance of gut microbiota caused by a high-fat diet (restoring the ratio of Firmicutes/Bacteroidetes and changing the abundances of Lactobacillus, Dubosiella, and Faecalibaculum), increasing short-chain fatty acids and decreasing gene expression in the liver (glucose 6-phosphatase, glucose transporter 1, peroxisome proliferator-activated receptor gamma (PPAR) receptor-1α, PPARα, PPARγ, and CCAAT enhancer binding protein α). We identified a regulatory relationship between polysaccharides, gut microbiota, and the liver as a potential mechanism by which polysaccharides can alleviate obesity.

Differences in anti-inflammatory properties of water soluble and insoluble bioactive polysaccharides in lipopolysaccharide-stimulated RAW264.7 macrophages.

β-Linked polysaccharides including β-glucans are well known to be important functional ingredients, and are known to possess immunomodulatory and anti-tumor activities. This study aimed to investigate the anti-inflammatory properties and participating receptor of water soluble and insoluble bioactive polysaccharides from Grifola frondosa (GFP, non-digestible water soluble polysaccharides), Laminaria digitata (laminarin, a water soluble β-glucan) and Saccharomyces cerevisiae (zymosan, a water insoluble β-glucan) in lipopolysaccharide (LPS)-stimulated parental and Dectin-1 highly expressing RAW264.7 macrophages. Results showed that GFP and laminarin significantly inhibited nitric oxide and prostaglandin E2 production, but only the GFP with high molecular weight exhibited strong inhibition on pro-inflammatory cytokine (TNF-α and IL-6) secretion in a concentration-dependent manner. The activation of NF-κB was also significantly down-regulated by GFP treatment as compared with cells treated with LPS alone. Although GFP and laminarin were able to bind to β-glucan receptor Dectin-1, there was no relationship between the inhibitory potency and the content of β-glucans in GFP, and these inhibitory effects were not affected by the expression level of Dectin-1 in macrophage cells. In contrast, zymosan significantly intensified LPS-induced inflammatory responses through Dectin-1. In conclusion, these results suggest that the inhibitory effects of water soluble polysaccharides on LPS-induced pro-inflammatory mediator production in murine macrophages may not involve β-glucan receptor Dectin-1.

Effects of Polysaccharides in Lycium Barbarum Berries from Different Regions of China on Macrophages Function and their Correlation to the Glycosidic Linkages.

The results showed that immunomodulation effects of polysaccharides in L. barbarum berries (LBPs) from different regions are similar, but different in degree, this might be caused by their different content of bioactive polysaccharides. Moreover, an enzymatic digestion method was used to investigate the structure-bioactivity relationship of polysaccharides from LBPs. The result indicated that α-1,4-d-galactosiduronic and α-1,5-arabinosidic linkages, especially the former one was significantly affect the immunomodulation effects of LBPs. The results were beneficial to the improvement of pharmacological activity-based quality control of LBPs and future development of related unique functional and health products.

Effects of Water-Soluble Polysaccharides with Different Chemical Structure, Isolated from Acorus calamus L. and Trifolium pratense L., on Nitric Oxide Production: A Screening Study.

Screening study of the effects of sweet flag (Acorus calamus L.) rhizome and clover (Trifolium pratense L.) aerial part on the production of NO by mouse macrophages was carried out. The polysaccharides were separated by ion exchange chromatography into fractions differing by monomeric composition and ramification type and were used in concentrations of 20, 40, and 100 μg/ml. Four fractions of Acorus calamus L. (PSF-101, PSF-102, PSF-103, and PSF-105), used in different concentrations, moderately stimulated nitrite production by macrophages. Three of five Trifolium pratense L. polysaccharides (PS62-3, PS62-4, and PS62-5) exhibited a significant specific effect on NO production. Rhamnogalactouronans from clover PS63-3 in all concentrations and from PS62-5 in a concentration of 100 μg/ml exhibited the highest activity, comparable to the NO-stimulatory activity of the reference LPS, while polysaccharide PS62-3 in a concentration of 40 μg/ml exhibited even higher activity.

Immunomodulatory Effect of Water Soluble Polysaccharides Isolated from Metroxylon sagu in Animal Models of Immunosuppression

Aim: This study was aimed to investigate the immunomodulatory activity of water soluble polysaccharides isolated from Metroxylon sagu (PSMS) by dilute acid extraction, ethanol precipitation in rats by using three different in-vivo experimental models of immunosuppression. Methodology: Three models of immunosuppression include metronidazole (MTZ) induced immunosuppression, pyrogallol induced immunosuppression and Ethanol-induced immunosuppression. Immunological indices like humoral antibody titer values, cellular immune response, percent change in phagocytosis, serum immunoglobulins were estimated. Histopathology of spleen was done in all control and treated groups. The doses of 500 and 250 mg/kg of PSMS were administered orally to evaluate the immunomodulatory activity. Results: Though PSMS was demonstrated to have immunostimulatory activity in almost all three models of immunosuppression, PSMS was found to be more effi cacious against ethanol-induced immunosuppression when compared with pyrogallol induced immunosuppression and MTZ induced immunosuppression. However, dose-dependent improvement in immunological indices was evident in all three models. Conclusion: In summary, water soluble polysaccharides isolated from M. sagu stimulate the immunity in the animal models of immunosuppression.

WITHDRAWN: Immunomodulatory effect of water-soluble polysaccharides isolated from Metroxylon sagu in rats

WITHDRAWN: Immunomodulatory effect of water-soluble polysaccharides isolated from Metroxylon sagu in rats

Inhibition of human gastric carcinoma cell growth in vitro by a polysaccharide from Aster tataricus

A water-soluble polysaccharide (WATP), with a molecular weight of 6.3×104Da, was isolated from Aster tataricus. According to gas chromatography (GC) analysis, WATP was composed of galactose, glucose, fucose, rhamnose, arabinose and mannose with molar ratios of 2.1:1.3:0.9:0.5:0.3:0.6. The effects of WATP on cell proliferation and apoptosis in human gastric cancer SGC-7901 cells were examined. MTT assay showed that WATP had a perfectly tumor growth inhibitory activity on SGC-7901 cells, but no cytotoxicity on SGC-7901 and primary human polymorphonuclear (PMN) cells analyzed using LDH assay. Flow cytometry analysis indicated that WATP could significantly induce apoptosis of SGC-7901 cells. Furthermore using Rh123 and Fluo-3 as fluorescent probes, respectively, it was found that mitochondrial transmembrane potential (ΔΨm) of treatment groups was significantly lower than that in un-treatment group and the concentration of calcium in cells exposed to WATP for 24h was increased in a dose dependent manner compared with unexposed group. These results suggest that WATP induces apoptosis of SGC-7901 cells through calcium- and ΔΨm-dependent pathways, indicating that it is potentially useful as a natural anti-cancer agent.