Fusion expression of the extracellular carbohydrate recognition domain of mouse Dectin-1 and its recognition of β-glucans in the cell wall of Candida albicans / 中华微生物学和免疫学杂志

Objective To clone, express and purify the extracellular carbohydrate recognition do-main(CRD) of Dectin-1 in mouse peritoneal macrophages and to further investigate its ability to recognize and bind to β-glucans. Methods The Dectin-1 CRD gone was amplified by RT-PCR from RNA of mouse peritoneal macrophages and cloned into prokaryotic expression vector pET28a (+), the constructed pET-CRD recombinant plasmid was transformed into Escherichia coli BL21 (DE3) and the fusion protein was in-duced to express. After affinity purification and renaturation, the fusion protein was incubated with Candida albicans yeast and its ability to recognize and bind to β-glucans in the cell wall of fungi. Results The fu-sion protein could recognize β-glucans in the fungal cell wall. Conclusion The recombinant expression plasmid pET28a-CRD was successfully constructed and the fusion protein was induced. The fusion protein is able to recognize and bind to β-glucans in the fungal cell wall, thus laying a good foundation for fungal de-tection and the exploration of the biological role of β-glucans.

Therapeutic effect of oat β-glucans on serum lipid levels of rats with experimental hyperlipemia / 第二军医大学学报

Objective: To investigate the therapeutic effect of oat β-glucans on serum lipid levels of rats with experimental hyperlipemia. Methods: Rats were fed on high fat forage for 3 weeks to establish hyperlipemia models, then the model rats were orally given oat β-glucans at doses of 133, 266 and 533 mg/(kg · d) separately. At the same time, there were 3 control groups including chitosan ligosaccharide[200 mg/(kg · d)], normal, and high blood lipid (model rats fed with distilled water). Serum levels of total cholesterol (TC), high density lipoprotein cholesterol (HDL-C) and low density lipoprotein cholesterol (LDL-C) were assayed in rats of all groups and the results were compared. Results: β-glucans obviously decreased the levels of TC and LDL-C and increased HDL-C in rat hyperlipemia models. The reduction of serum lipid level in 4-week β-glucans treatment rats was more obvious than that in 3-week β-glucans treatment rats. Besides, β-glucans showed an obvious dosage dependent effect in reducing serum lipid level without adverse effect. Oat β-glucans had a better lipid-reducing effect than ligosaccharide did. Conclusion: Oat β-glucans can obviously decrease serum lipid in rats with hyperlipemia.