Abstract: To explore the mechanism of the intestinal microecology regulation by polysaccharide prebiotics, ELISA, histopathologic analysis, immunohistochemical analysis, 16S rRNA high-throughput sequencing, and gas chromatography-mass spectrometry were applied to investigate the effects of fermented polysaccharides on changes in the intestinal microbiota and short-chain fatty acids (SCFAs) in mice with dextran sulfate sodium (DSS)-induced colitis model and their relationship with the level of intestinal inflammation and barrier protein expression. It was found that fermented Lycium barbarum polysaccharides (FLBP) significantly reduced intestinal inflammation level, improved colonic tissue structure, up-regulated the expression of tight junction proteins Claudin-1 and ZO-1, and significantly increased the content of intestinal SCFAs in mice. Gut bacteria analyses showed that FLBP enriched intestinal Dubosiella and Akkermansia in mice and decreased the abundance of Turicibacter, Faecalibaculum, and Escherichia-Shigella. Results showed that remodeled Dubosiella activated by FLBP played a dominant role in ameliorating colitis by significantly increasing SCFAs content, improving intestinal barrier and reducing intestinal inflammation. The study aimed to provide a safer and better option for the amelioration of colitis and to provide a theoretical basis for the development of functional foods with FLBP.

Objective To explore the stimulating effect of bear bile eye drops on rabbit eyes frequently in order to provide experimental basis for drug use. Methods Bear bile eye drops dripped into the right eye of rabbit conjunctival sac as experimental group ( different frequency as 1, 5, 10 min) while normal saline was used in the left eye of rabbit as the control group ( one drop once and 10 times continually) . We observed the stimulation of rabbit eyes at 0, 6, 12, 24, 48 hours after the last dripping. Results At the observation of 5 and 10 min interval set, the right eyes of rabbit had no hyperemia, no edema, no secretion, no maculae corneae, and normal iris that was 1 score according to eye stimulation response scale belonging no irritation. After 1 min interval set observation of right eyes, they presented light conjunctiva hyperemia, light edema, increased secretion of conjunctiva sac with 5 score belonging to light stimulation;but it decreased to 3 scores at 6 h interval set belonging to no stimulation;the average score declined underneath 1 score at the observation of 12 h interval set. Conclusions Bear bile eye drops can arouse reversible light stimulation when used in high frequency, so the safety is high, but we should avoid the high frequency of use.