ABSTRACT
The aim of this study was to investigate the regulatory effect of the total glycoside extracted from leaves of Rehmannia (TLR) and Dihuangye total glycoside capsule (DTG) on intestinal microflora in diabetic nephropathy rats. Forty-eight rats were randomly divided into the control group (C), model group (M), Huangkui capsule group (0.75 g·kg-1·d-1, HK), irbesartan group (27 mg·kg-1·d-1, YX), TLR low dose group (4.3 g·kg-1·d-1, DHYL), TLR high dose group (7.2 g·kg-1·d-1, DHYH), DTG low dose group (216 mg·kg-1·d-1, JNL), DTG high dose group (360 mg·kg-1·d-1, JNH). Rat model of diabetic nephropathy was induced by intraperitoneal injection of small dose of streptozotocin (45 mg·kg-1, STZ) and feeding high-fat diet and 5% glucose drinking water. After oral administration for two weeks, the 16S rDNA sequencing method was used to study the effects of the TLR and DTG on intestinal flora in diabetic nephropathy rats. The results showed that compared with the control group, the intestinal flora of diabetic nephropathy rats had changed from phylum units to the genus units. Moreover, the proportion of lactobacilli in the intestinal bacteria of the model group was significantly decreased, and the proportion of lactobacilli in the administration group was increased, especially the YX group, TLR low dose group and DTG low dose group. The data suggest that the total glycosides of Rehmannia glutinosa improved the disorder of intestinal flora in STZ-induced diabetic nephropathy rats.
ABSTRACT
This paper investigated the diversity of the silkworm excrement bacterial communities in different ages before and after drying, aiming to clarify the differences of bacterial communities in composition and bacterial abundance and the influences of drying treatment, and provide scientific basis for the efficacy of scientific connotation and utilization of silkworm excrement. High-throughput sequencing technique was used to measure the sequence of 16S rDNA-V4 variable region of bacteria in silkworm excrement. QIIME, Mothur and PICRUSt software programs were employed to sort and calculate the number of sequences and operational taxonomic units (OTUs) for each sample. Thereafter, the abundance, distribution, alpha diversity index of species, beta diversity and bacterial communities diversity among different sample groups and predicted the bacterial gene functions were analyzed. In this study, the numbers of effective sequences for six samples were 259 250; the rarefaction curves showed a sufficient sequencing depth, and the number of OTUs was close to saturation. The bacteria in silkworm excrement belonged to the following five phylums: Proteobacteria (89.3%), Actinobacteria (5.0%), Firmicutes (4.4%), Bacteroidetes (1.1%) and Cyanobacteria (0.2%). The dominant specie was Cyanobacteria of the total bacteria identified, respectively. The abundances and diversities of the silkworm excrement bacterial communities have been reduced after drying treatment, especially the silkworm excrement of the fifth instar. PICRUSt analysis was performed to show that abundance of the functional genes such as membrane transport, carbohydrate metabolism, amino acid metabolism, lipid metabolism, nucleotide metabolism, cellular processes and signaling were relatively high. The result showed that the drying treatment could decreased the species and numbers of pathogenic bacteria in silkworm excrement obviously and improve the quality of medicinal materials. Compared with the lower ages, silkworm excrement of fifth instar seems like to be more suitable for use in medicine. Illumina MiSeq high-throughput sequencing system provides a more accurate and scientific data resource for the study of bacteria in silkworm excrement.