OBJECTIVE:To study in vitro bacteriostatic activity of the extracts from Miao medicine Polygonum runcinatum. METHODS:Using chloramphenicol and fluconazole as positive control,the inhibitory effects of water extract,95％ ethanol extract and its ethyl acetate and n-butanol fraction on 9 kinds of strains were determined by cup plate method, such as Staphylococcus aureus,Escherichia coli,Shigella flexneri,Salmonella typhi,Bacillus subtilis,Pseudomonas aeruginosa,type B Hemolytic streptococcus,Candida albicans and Cryptococcus neoformans. The parts with bacteriostatic activity and trial strains sensitive to drug were screened. Micro-broth dilution method and agar culture medium plate method were used to determine MIC and MBC of 95％ ethanol extract and its fractions of P. runcinatum to sensitive strains. RESULTS:The water extract of P. runcinatum almost had no inhibitory effect. 95％ ethanol extract showed different degrees of bacteriostatic activity to strains;bacteriostatic effects of it to 6 kinds of bacteria as S. typhi was better than that of type B H. streptococcus and 2 kinds of fungus. The ethyl acetate and n-butanol fraction of 95％ ethanol extracts showed good bacteriostatic effect and the ethyl acetate fraction had stronger effect,while all the fractions of 95％ ethanol extracts showed no inhibitory effect on fungus. MIC and MBC of 95％ethanol extract to above 6 kinds of bacteria were 6.25-12.5 and 12.5-25 mg/mL,respectively;MIC and MBC of ethyl acetate fraction were 3.13-6.25, 6.25-12.5 mg/mL; MIC and MBC of n-butanol fraction were 6.25-12.5, 12.5-25 mg/mL. CONCLUSIONS:95％ ethanol extract,ethyl acetate and n-butanol fractions of Miao medicine P. runcinatum have obvious in vitro bacteriostatic activity to 6 common bacterias as S. typhi.

Objective To investigate the effect of intestinal flora on the efficacy of polyethylene glycol losenatide(PEX168)in mice with type 2 diabetes mellitus(T2DM).Methods A total of 50 healthy male C57BL/6 mice were fed with a high-fat diet combined with STZ to establish a T2DM mouse model.Among them,40 were successfully modeled and divided into T2DM group(n=10)and PEX168 group(n=30).PEX168 group was further divided into two sub groups according to HbA1c:ideal group(IE subgroup,HbA1c≤6.5%,n=12)and unsatisfactory group(NE subgroup,HbA1c>6.5%,n=12).IE subgroup was fecal donor,NE subgroup was recipientand further divided into fecal bacteria transplantation subgroup(FMT,n=5)and Sham subgroup(Sham,n=5).Fecal bacteria transplantation(FMT)was used to transfer fecal bacteria from IE group to FMT group.Body weight,food intake and blood glucose were measured every 2 weeks in all the groups.FPG,FIns,HbA1c and insulin resistance index(HOMA-IR)were compared on the 7th day after 10 weeks of intervention in all the groups.Results FPG and body weight were lower at the 4th,6th,8th and 10th week(P<0.05),and food intake was lower in PEX168 group than in T2DM group at the 2nd,4th,6th,8th and 10th week(P<0.05).At the 4th,6th,8th and 10th week after administration,the FPG and body weight were lower in IE subgroup than in NE subgroup(P<0.05),and the food intake was lower at the 0th,4th,8th and 10th week after administration than in NE subgroup(P<0.05).The FBG,body weight and food intake were lower in FMT subgroup than in Sham subgroup at 4,6 and 8 weeks(P<0.05).The FPG,HbA1c,2 hPG,FIns and HOMA-IR were lowerin PEX168 group after treatment than in PEX168 group before treatment and T2DM group after treatment(P<0.05).FPG,HbA1c,FIns,2 hPG and HOMA-IR were lower in IE subgroup after treatment than in IE subgroup before treatment and NE subgroup after treatment(P<0.05).FPG,HbA1c,FIns,2 hPG and HOMA-IR were lower in FMT subgroup after treatment than in FMT subgroup before treatment and Sham subgroup after treatment(P<0.05).Conclusions Differences in intestinal flora between individuals affect the efficacy of PEX168.FMT treatment can improve the composition of intestinal flora and affect the efficacy of PEX168.