Objective: This study examined the gut bacterial communities of dogs from different breeds, all kept under identical domestication conditions. Methods: Noninvasive sampling and 16S rRNA high-throughput sequencing were used to compare the composition and function of the gut microbiota of three dog breeds: the Chinese Kunming dog (CKD), German Shepherd dog (GSD), and Belgian Malinois dog (BMD). Results: The gut microbiota of the three dog breeds consisted of 257 species across 146 genera, 60 families, 35 orders, 15 classes, and 10 phyla. The dominant bacterial phyla across the three breeds were Firmicutes (57.44%), Fusobacteriota (28.86%), and Bacteroidota (7.63%), while the dominant bacterial genera across the three breeds were Peptostreptococcus (21.08%), Fusobacterium (18.50%), Lactobacillus (12.37%), and Cetobacter (10.29%). Further analysis revealed significant differences in the intestinal flora of the three breeds at the phylum and genus levels. The intestinal flora of BMD was significantly richer than that of CKD and GSD. The functional prediction and Kyoto Encyclopedia of Genes and Genomes analysis showed that the primary functions of the gut microbiota in these breeds were similar, with significant enrichment in various metabolic pathways, including carbohydrate and amino acid metabolism, secondary metabolite biosynthesis, and microbial metabolism in different environments. The intestinal flora of these breeds also played a crucial role in genetic information processing, including transcription, translation, replication, and material transport. Conclusions and Relevance: These results provide novel insights into the intestinal flora of intervention dogs and suggest novel methods to improve their health status, which help increase microbial diversity and normalize metabolite production in diseased dogs.

Objective: This study examined the gut bacterial communities of dogs from different breeds, all kept under identical domestication conditions. Methods: Noninvasive sampling and 16S rRNA high-throughput sequencing were used to compare the composition and function of the gut microbiota of three dog breeds: the Chinese Kunming dog (CKD), German Shepherd dog (GSD), and Belgian Malinois dog (BMD). Results: The gut microbiota of the three dog breeds consisted of 257 species across 146 genera, 60 families, 35 orders, 15 classes, and 10 phyla. The dominant bacterial phyla across the three breeds were Firmicutes (57.44%), Fusobacteriota (28.86%), and Bacteroidota (7.63%), while the dominant bacterial genera across the three breeds were Peptostreptococcus (21.08%), Fusobacterium (18.50%), Lactobacillus (12.37%), and Cetobacter (10.29%). Further analysis revealed significant differences in the intestinal flora of the three breeds at the phylum and genus levels. The intestinal flora of BMD was significantly richer than that of CKD and GSD. The functional prediction and Kyoto Encyclopedia of Genes and Genomes analysis showed that the primary functions of the gut microbiota in these breeds were similar, with significant enrichment in various metabolic pathways, including carbohydrate and amino acid metabolism, secondary metabolite biosynthesis, and microbial metabolism in different environments. The intestinal flora of these breeds also played a crucial role in genetic information processing, including transcription, translation, replication, and material transport. Conclusions and Relevance: These results provide novel insights into the intestinal flora of intervention dogs and suggest novel methods to improve their health status, which help increase microbial diversity and normalize metabolite production in diseased dogs.

Objective: This study examined the gut bacterial communities of dogs from different breeds, all kept under identical domestication conditions. Methods: Noninvasive sampling and 16S rRNA high-throughput sequencing were used to compare the composition and function of the gut microbiota of three dog breeds: the Chinese Kunming dog (CKD), German Shepherd dog (GSD), and Belgian Malinois dog (BMD). Results: The gut microbiota of the three dog breeds consisted of 257 species across 146 genera, 60 families, 35 orders, 15 classes, and 10 phyla. The dominant bacterial phyla across the three breeds were Firmicutes (57.44%), Fusobacteriota (28.86%), and Bacteroidota (7.63%), while the dominant bacterial genera across the three breeds were Peptostreptococcus (21.08%), Fusobacterium (18.50%), Lactobacillus (12.37%), and Cetobacter (10.29%). Further analysis revealed significant differences in the intestinal flora of the three breeds at the phylum and genus levels. The intestinal flora of BMD was significantly richer than that of CKD and GSD. The functional prediction and Kyoto Encyclopedia of Genes and Genomes analysis showed that the primary functions of the gut microbiota in these breeds were similar, with significant enrichment in various metabolic pathways, including carbohydrate and amino acid metabolism, secondary metabolite biosynthesis, and microbial metabolism in different environments. The intestinal flora of these breeds also played a crucial role in genetic information processing, including transcription, translation, replication, and material transport. Conclusions and Relevance: These results provide novel insights into the intestinal flora of intervention dogs and suggest novel methods to improve their health status, which help increase microbial diversity and normalize metabolite production in diseased dogs.

Objective: This study examined the gut bacterial communities of dogs from different breeds, all kept under identical domestication conditions. Methods: Noninvasive sampling and 16S rRNA high-throughput sequencing were used to compare the composition and function of the gut microbiota of three dog breeds: the Chinese Kunming dog (CKD), German Shepherd dog (GSD), and Belgian Malinois dog (BMD). Results: The gut microbiota of the three dog breeds consisted of 257 species across 146 genera, 60 families, 35 orders, 15 classes, and 10 phyla. The dominant bacterial phyla across the three breeds were Firmicutes (57.44%), Fusobacteriota (28.86%), and Bacteroidota (7.63%), while the dominant bacterial genera across the three breeds were Peptostreptococcus (21.08%), Fusobacterium (18.50%), Lactobacillus (12.37%), and Cetobacter (10.29%). Further analysis revealed significant differences in the intestinal flora of the three breeds at the phylum and genus levels. The intestinal flora of BMD was significantly richer than that of CKD and GSD. The functional prediction and Kyoto Encyclopedia of Genes and Genomes analysis showed that the primary functions of the gut microbiota in these breeds were similar, with significant enrichment in various metabolic pathways, including carbohydrate and amino acid metabolism, secondary metabolite biosynthesis, and microbial metabolism in different environments. The intestinal flora of these breeds also played a crucial role in genetic information processing, including transcription, translation, replication, and material transport. Conclusions and Relevance: These results provide novel insights into the intestinal flora of intervention dogs and suggest novel methods to improve their health status, which help increase microbial diversity and normalize metabolite production in diseased dogs.

Objective:To study the inhibitory effect of endothelial progenitor cells (EPCs) on aortic injury in mice with systemic lupus erythematosus (SLE) arteriosclerosis.Methods:APOE -/- mice were injected with norphytane and high fat diet to establish lupus vascular injury model. Then the mice were divided into normal control group (ND group), high fat diet group (HFD group), high fat diet+ SLE vascular injury group (HFD+ SLE group), high fat diet+ SLE vascular injury+ hydroxychloroquine treatment group (HFD+ SLE+ Hydro group), high fat diet+ SLE vascular injury+ EPCs treatment group (HFD+ SLE+ EPCs group). At the end of the experiment, urine, blood and aortic tissues of mice in each group were collected, and the content of urinary protein and the depth of serum type I interferon (IFN-Ⅰ) were detected by enzyme linked immunosorbent assay (ELISA). The activation of cyclic guanosine monophosphate synthase/interferon gene stimulating factor/type I interferon (cGAS/STING/IFN-Ⅰ) pathway, the levels of inflammatory factors, adhesion fractions and chemokines in the aorta of mice in each group were detected by immunohistochemistry and Western blotting (WB). The lipid deposition in the aorta was detected by oil red staining. Results:The results of ELISA showed that the levels of urinary protein and serum IFN-Ⅰ in HFD+ SLE group were higher than those in normal control group. EPCs treatment could reduce the levels of urinary protein and serum IFN-Ⅰ in SLE atherosclerotic mice. WB results showed that the expression of CD19, CD68, CD34, chemokine, cGAS, p-STING, phosphorylated TANK binding kinase 1 (p-TBK1), phosphorylated interferon regulatory factor 3 (p-IRF3) and IFN-Ⅰ increased in HFD+ SLE group, and hydroxychloroquine and EPCs decreased the levels of these factors. CGAS/STING/IFN-Ⅰ signal pathway is involved in the occurrence and development of atherosclerosis in SLE patients; both EPCs and hydroxychloroquine can inhibit the activation of cGAS/STING/IFN-Ⅰ signal, thus reducing atherosclerosis in SLE mice.Conclusions:cGAS/STING/IFN-Ⅰ pathway is involved in the development of SLE atherosclerosis. EPCs can inhibit the activation of cGAS/STING signal, reduce the expression and secretion of IFN-Ⅰ, and then reduce vascular inflammation and inhibit the development of SLE-related atherosclerosis.

Objective:To study the inhibitory effect of endothelial progenitor cells (EPCs) on aortic injury in mice with systemic lupus erythematosus (SLE) arteriosclerosis.Methods:APOE -/- mice were injected with norphytane and high fat diet to establish lupus vascular injury model. Then the mice were divided into normal control group (ND group), high fat diet group (HFD group), high fat diet+ SLE vascular injury group (HFD+ SLE group), high fat diet+ SLE vascular injury+ hydroxychloroquine treatment group (HFD+ SLE+ Hydro group), high fat diet+ SLE vascular injury+ EPCs treatment group (HFD+ SLE+ EPCs group). At the end of the experiment, urine, blood and aortic tissues of mice in each group were collected, and the content of urinary protein and the depth of serum type I interferon (IFN-Ⅰ) were detected by enzyme linked immunosorbent assay (ELISA). The activation of cyclic guanosine monophosphate synthase/interferon gene stimulating factor/type I interferon (cGAS/STING/IFN-Ⅰ) pathway, the levels of inflammatory factors, adhesion fractions and chemokines in the aorta of mice in each group were detected by immunohistochemistry and Western blotting (WB). The lipid deposition in the aorta was detected by oil red staining. Results:The results of ELISA showed that the levels of urinary protein and serum IFN-Ⅰ in HFD+ SLE group were higher than those in normal control group. EPCs treatment could reduce the levels of urinary protein and serum IFN-Ⅰ in SLE atherosclerotic mice. WB results showed that the expression of CD19, CD68, CD34, chemokine, cGAS, p-STING, phosphorylated TANK binding kinase 1 (p-TBK1), phosphorylated interferon regulatory factor 3 (p-IRF3) and IFN-Ⅰ increased in HFD+ SLE group, and hydroxychloroquine and EPCs decreased the levels of these factors. CGAS/STING/IFN-Ⅰ signal pathway is involved in the occurrence and development of atherosclerosis in SLE patients; both EPCs and hydroxychloroquine can inhibit the activation of cGAS/STING/IFN-Ⅰ signal, thus reducing atherosclerosis in SLE mice.Conclusions:cGAS/STING/IFN-Ⅰ pathway is involved in the development of SLE atherosclerosis. EPCs can inhibit the activation of cGAS/STING signal, reduce the expression and secretion of IFN-Ⅰ, and then reduce vascular inflammation and inhibit the development of SLE-related atherosclerosis.

Objective:To choose a suitable efficient concentration of adenosine triphosphate (ATP) which can induce human dental pulp cells (HDPC) differentiate into odontoblast successfully, and explore the role of this concentration of ATP in dentin regeneration in vivo. Methods:HDPC were treated with different concentrations (0, 10, 400, 600, 800 μmol/L) of ATP. Then cell counting kit-8 (CCK-8), quantitative real-time PCR, and Western blotting were used to detect the cell proliferation and the expressions of odontoblastic differentiation related markers, dentin matrix protein 1 (DMP1) and dentin sialophosphoprotein (DSPP). Alizarin red S staining experiment was used to analyze the effect of ATP on the mineralization ability of HDPC. By the above experiments, the suitable effective concentration of ATP was chosen to pretreat the HDPC for 7 days, then cells were seeded on gelfoam, inserted into the root canal fragment, and subsequently transplanted into the subcutaneous space on the back of immunodeficient mice, after three months, the samples were stained with HE for histological analysis.Results:The CCK-8 results in 5 d showed that 10 μmol/L ATP obviously promoted the proliferation of HDPC, while the 600 and 800 μmol/L ATP apparently inhibited the HDPC proliferation, however, the proliferation in 800 μmol/L ATP group was lower than that of 600 μmol/L ATP group ( P<0.05). qPCR and Western blotting results showed that the 600 and 800 μmol/L ATP significantly up-regulated the DMP1 and DSPP expressions ( P<0.05), furthermore, there was no significant difference in the two groups, but no changes were found in other groups ( P>0.05). After 21 days of culturing, there were obvious mineralization nodules in 600 and 800 μmol/L ATP groups, but no mineralization nodules in other groups. Quantitative analysis of the staining results showed the A value in 0, 10, 400, 600, and 800 μmol/L ATP groups were respectively 1.05±0.15, 1.11±0.23, 1.15±0.17, 3.65±0.30, and 3.40±0.43, and the A value in 600 and 800 μmol/L ATP groups were higher than those of other groups; however, there was no difference in 600 and 800 μmol/L ATP groups. The histological analysis showed that 600 μmol/L ATP could induce the HDPC differentiate into dentin-like structure in the root canal fragment. Conclusions:Therefore, the suitable effective concentration of ATP is 600 μmol/L, which could induce HDPC differentiate into odontoblast-like cells, and form the dentin-like structure in vivo.