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BMC Microbiology May 2024Antibiotic-associated diarrhea (AAD) refers to symptoms of diarrhea that cannot be explained by other causes after the use of antibiotics. AAD is thought to be caused by...
BACKGROUND
Antibiotic-associated diarrhea (AAD) refers to symptoms of diarrhea that cannot be explained by other causes after the use of antibiotics. AAD is thought to be caused by a disruption of intestinal ecology due to antibiotics. Fecal Microbiota Transplantation (FMT) is a treatment method that involves transferring microbial communities from the feces of healthy individuals into the patient's gut.
METHOD
We selected 23 AAD patients who received FMT treatment in our department. Before FMT, we documented patients' bowel movement frequency, abdominal symptoms, routine blood tests, and inflammatory markers, and collected fecal samples for 16S rRNA sequencing to observe changes in the intestinal microbiota. Patients' treatment outcomes were followed up 1 month and 3 months after FMT.
RESULTS
Out of the 23 AAD patients, 19 showed a clinical response to FMT with alleviation of abdominal symptoms. Among them, 82.61% (19/23) experienced relief from diarrhea, 65% (13/20) from abdominal pain, 77.78% (14/18) from abdominal distension, and 57.14% (4/7) from bloody stools within 1 month after FMT. Inflammatory markers IL-8 and CRP significantly decreased after FMT, but there were no noticeable changes in WBC, IL-6, and TNF-α before and after transplantation. After FMT, the abundance of Bacteroides and Faecalibacterium increased in patients' fecal samples, while the abundance of Escherichia-Shigella and Veillonella decreased.
CONCLUSION
FMT has a certain therapeutic effect on AAD, and can alleviate abdominal symptoms and change the intestinal microbiota of patients.
Topics: Humans; Diarrhea; Fecal Microbiota Transplantation; Gastrointestinal Microbiome; Female; Male; Middle Aged; Anti-Bacterial Agents; Feces; Adult; RNA, Ribosomal, 16S; Aged; Treatment Outcome; Bacteria
PubMed: 38724904
DOI: 10.1186/s12866-024-03261-0 -
Probiotics and Antimicrobial Proteins May 2024Bifidobacterium longum (B. longum) is a beneficial anaerobic bacteria that may improve cardiovascular disease (CVD). We studied B. longum L556, isolated from healthy...
Bifidobacterium longum (B. longum) is a beneficial anaerobic bacteria that may improve cardiovascular disease (CVD). We studied B. longum L556, isolated from healthy human feces, in coronary heart disease (CHD) patients through anaerobic fermentation in vitro. Results showed that B. longum L556 increased Lactobacillus, Faecalibacterium, Prevotella, and Alistipes, while reducing Firmicutes to Bacteroidetes, Eggerthella, Veillonella, Holdemanella, and Erysipelotrichaceae_UCG-003 in the gut microbiota of CHD patients. B. longum L556 also enhanced anti-inflammatory effects by modulating gut microbiota and metabolites like SCFAs. Additionally, it regulated lipid and amino acid metabolism in fermentation metabolites from the CHD group. These findings suggest that B. longum L556 has potential for improving CHD by modulating the intestinal microbiota, promoting SCFA production, and regulating lipid metabolism and inflammation.
PubMed: 38722549
DOI: 10.1007/s12602-024-10267-7 -
Science Advances May 2024Lactic acid (LA) accumulation in the tumor microenvironment poses notable challenges to effective tumor immunotherapy. Here, an intelligent tumor treatment microrobot...
Lactic acid (LA) accumulation in the tumor microenvironment poses notable challenges to effective tumor immunotherapy. Here, an intelligent tumor treatment microrobot based on the unique physiological structure and metabolic characteristics of (VA) is proposed by loading cell membrane-coating BaTiO nanocubes (SAM@BTO) on the surface of VA cells (VA-SAM@BTO) via click chemical reaction. Following oral administration, VA-SAM@BTO accurately targeted orthotopic colorectal cancer through inflammatory targeting of SAM and hypoxic targeting of VA. Under in vitro ultrasonic stimulation, BTO catalyzed two reduction reactions (O → •O and CO → CO) and three oxidation reactions (HO → •OH, GSH → GSSG, and LA → PA) simultaneously, effectively inducing immunogenic death of tumor cells. BTO catalyzed the oxidative coupling of VA cells metabolized LA, effectively disrupting the immunosuppressive microenvironment, improving dendritic cell maturation and macrophage M1 polarization, and increasing effector T cell proportions while decreasing regulatory T cell numbers, which facilitates synergetic catalysis and immunotherapy.
Topics: Colorectal Neoplasms; Immunotherapy; Animals; Mice; Humans; Catalysis; Tumor Microenvironment; Cell Line, Tumor; Nanostructures; Biomimetic Materials; Administration, Oral; Titanium; Biomimetics; Lactic Acid; Dendritic Cells; Barium Compounds
PubMed: 38718119
DOI: 10.1126/sciadv.adm9561 -
Gut Pathogens May 2024Bile reflux (BR) can influence the gastric environment by altering gastric acidity and possibly the gastric microbiota composition. This study investigated the...
BACKGROUND/AIMS
Bile reflux (BR) can influence the gastric environment by altering gastric acidity and possibly the gastric microbiota composition. This study investigated the correlation between bile acids and microbial compositions in the gastric juice of 50 subjects with differing gastric pathologies.
METHODS
This study included 50 subjects, which were categorized into three groups based on the endoscopic BR grading system. The primary and secondary bile acid concentrations in gastric juice samples were measured, and microbiota profiling was conducted using 16 S rRNA gene sequencing.
RESULTS
Significant differences were observed in each bile acid level in the three endoscopic BR groups (P < 0.05). The Shannon index demonstrated a significant decrease in the higher BR groups (P < 0.05). Analysis of the β-diversity revealed that BR significantly altered the gastric microbiota composition. The presence of neoplastic lesions and the presence of H. pylori infection impacted the β-diversity of the gastric juice microbiota. The abundance of the Streptococcus and Lancefielfdella genera exhibited positive correlations for almost all bile acid components(P < 0.05). In addition, the abundance of Slobacterium, Veillonella, and Schaalia showed positive correlations with primary unconjugated bile acids (P < 0.05).
CONCLUSION
Changes in microbial diversity in the gastric juice were associated with BR presence in the stomach. This result suggests that the degree of BR should be considered when studying the gastric juice microbiome.
PubMed: 38715101
DOI: 10.1186/s13099-024-00619-7 -
Oral microbiome dysbiosis among cigarette smokers and smokeless tobacco users compared to non-users.Scientific Reports May 2024Tobacco use significantly influences the oral microbiome. However, less is known about how different tobacco products specifically impact the oral microbiome over time....
Tobacco use significantly influences the oral microbiome. However, less is known about how different tobacco products specifically impact the oral microbiome over time. To address this knowledge gap, we characterized the oral microbiome of cigarette users, smokeless tobacco users, and non-users over 4 months (four time points). Buccal swab and saliva samples (n = 611) were collected from 85 participants. DNA was extracted from all samples and sequencing was carried out on an Illumina MiSeq, targeting the V3-V4 region of the 16S rRNA gene. Cigarette and smokeless tobacco users had more diverse oral bacterial communities, including a higher relative abundance of Firmicutes and a lower relative abundance of Proteobacteria, when compared to non-users. Non-users had a higher relative abundance of Actinomyces, Granulicatella, Haemophilus, Neisseria, Oribacterium, Prevotella, Pseudomonas, Rothia, and Veillonella in buccal swab samples, compared to tobacco users. While the most abundant bacterial genera were relatively constant over time, some species demonstrated significant shifts in relative abundance between the first and last time points. In addition, some opportunistic pathogens were detected among tobacco users including Neisseria subflava, Bulleidia moorei and Porphyromonas endodontalis. Overall, our results provide a more holistic understanding of the structure of oral bacterial communities in tobacco users compared to non-users.
Topics: Humans; Tobacco, Smokeless; Male; Microbiota; Female; Dysbiosis; Adult; RNA, Ribosomal, 16S; Mouth; Saliva; Middle Aged; Bacteria; Smokers; Young Adult; Cigarette Smoking; Mouth Mucosa
PubMed: 38710815
DOI: 10.1038/s41598-024-60730-2 -
Archives of Oral Biology Aug 2024The effectiveness of supragingival dental biofilm control during orthodontic treatment and changes in the bacterial profile were analyzed. (Randomized Controlled Trial)
Randomized Controlled Trial
OBJECTIVE
The effectiveness of supragingival dental biofilm control during orthodontic treatment and changes in the bacterial profile were analyzed.
DESIGN
Sixty-four participants aged 12-22 years (57% female) were included in the study. Participants underwent orthodontic treatment with fixed appliances and were randomly assigned to one of the three groups, which during a period of one month: (I) used chlorhexidine digluconate (CHX), (II) used high concentration of fluoride (F) gel and (III) performed standard oral hygiene. The plaque and gingivitis index, pH of biofilm and white spot lesions (WSL) were assessed. Changes of the bacteria in the biofilm were analyzed by the quantitative polymerase chain reaction RESULTS: Increase in the plaque index, pH of biofilm, and WSL was observed during orthodontic treatment with standard oral hygiene. Large interindividual variability was present, and the effects of one-month use of fluorides and CHX on clinical parameters were not significant. Despite standard hygiene the abundance of studied biofilm bacteria increased - the most Streptoccocus mutans (14.2x) and S. salivarius (3.3x), moderate Veillonella parvula (3x) and the least S. sobrinus (2.3x) and Agregatibacter actinomycetemcomitans (1.9x). The use of CHX reduced S. sobrinus (2.2x) and A. actinomycetemcomitans (1.9x). Fluoride use reduced A. actinomycetemcomitans (1.3x) and S. sobrinus (1.2x). Fluorides better controlled S. mutans than CHX.
CONCLUSION
Bacterial biomass in supragingival biofilm increased during treatment with metal orthodontic appliances, with greater increase in cariogenic bacteria than periopathogens. Fluoride controlled S. mutans, while CHX S. sobrinus and A. actinomycetemcomitans.
Topics: Humans; Biofilms; Female; Adolescent; Chlorhexidine; Child; Male; Orthodontic Appliances, Fixed; Young Adult; Fluorides; Dental Plaque Index; Oral Hygiene; Dental Plaque; Hydrogen-Ion Concentration; Streptococcus mutans; Gingivitis; Anti-Infective Agents, Local; Polymerase Chain Reaction; Dental Caries
PubMed: 38701663
DOI: 10.1016/j.archoralbio.2024.105984 -
Tissue Barriers May 2024Celiac disease (CD) is characterized by the disruption of the intestinal barrier integrity and alterations in the microbiota composition. This study aimed to evaluate...
Celiac disease (CD) is characterized by the disruption of the intestinal barrier integrity and alterations in the microbiota composition. This study aimed to evaluate the changes in the fecal microbiota profile and mRNA expressions of intracellular junction-related genes in pediatric patients with CD compared to healthy controls (HCs). Thirty treated CD patients, 10 active CD, and 40 HCs were recruited. Peripheral blood (PB) and fecal samples were collected. Microbiota analysis was performed using quantitative real-time PCR (qPCR) test. The mRNA expressions of ZO-1, occludin, β-catenin, E-cadherin, and COX-2 were also evaluated. In active and treated CD patients, the PB expression levels of ZO-1 ( = 0.04 and 0.002, respectively) and β-catenin ( = 0.006 and 0.02, respectively) were lower than in HCs. PB Occludin's level was upregulated in both active and treated CD patients compared to HCs ( = 0.04 and 0.02, respectively). However, PB E-cadherin and COX-2 expression levels and fecal mRNA expressions of ZO-1, occludin, and COX-2 did not differ significantly between cases and HCs (P˃0.05). Active CD patients had a higher relative abundance of the ( = 0.04) and ( = 0.03) phyla compared to treated subjects. The relative abundance of ( = 0.04) and ( = 0.01) genera was lower in active patients in comparison to HCs. Researchers should explore the precise impact of the gut microbiome on the molecules and mechanisms involved in intestinal damage of CD. Special attention should be given to and Enterobacteriaceae, as they have shown a significant correlation with the expression of tight junction-related genes.
PubMed: 38695199
DOI: 10.1080/21688370.2024.2347766 -
Frontiers in Microbiology 2024Emerging evidence demonstrates that the gastrointestinal microbiome has the potential to be a biomarker in neoadjuvant chemoradiotherapy for colorectal cancer (CRC). Yet...
BACKGROUND
Emerging evidence demonstrates that the gastrointestinal microbiome has the potential to be a biomarker in neoadjuvant chemoradiotherapy for colorectal cancer (CRC). Yet studies on the impact of the gastric microbiome (GM) on the response to neoadjuvant chemotherapy (NACT) are still scarce.
METHODS
Forty-eight patients with gastric cancer participated in this retrospective study, and 16S rRNA sequencing was performed to evaluate formalin-fixed and paraffin-embedded (FFPE) tissue biospecimens and fresh-frozen tissues.
RESULTS
In this study, 16 bacterial taxa at different levels, including , , and , were identified to be enriched before NACT in response (R) patients in group FFPE. In contrast, 6 bacterial taxa, such as , (), etc. were enriched after NACT, in which we reported for the first time that the phylum was enriched before NACT in R patients. Thirty-one bacterial taxa of , , , and were identified in group mucosa as being enriched in R patients. In comparison, 4 bacterial taxa dominated by the phylum were enriched in NR patients. Notably, the family was found in both tissue samples, and the metabolic pathways, including the citrate cycle (TCA cycle) and various amino acids, including alanine, were found to be potentially predictive in both sample species.
CONCLUSION
There are differences in the features of the GM for different NACT response results. The causal relationship deserves to be confirmed by further investigations.
PubMed: 38694796
DOI: 10.3389/fmicb.2024.1357261 -
Journal of Ethnopharmacology Sep 2024Moshen Fuyuan Formula (MSFY) is one of the representative Chinese medicine compound for Idiopathic membranous nephropathy (IMN), that originate from Fang Ji Huang Qi...
ETHNOPHARMACOLOGICAL RELEVANCE
Moshen Fuyuan Formula (MSFY) is one of the representative Chinese medicine compound for Idiopathic membranous nephropathy (IMN), that originate from Fang Ji Huang Qi decoction in the Han dynasty. IMN is usually accompanied by different tongue coatings in traditional Chinese medicine (TCM), and tongue microorganisms are important factors affecting the formation of the tongue coating. Recently, oral microbiomes, including bacteria and fungi, have been identified as pivotal factors that contribute to disease development. However, the regulation of oral microbiomes by MSFY has not been defined.
AIM OF THE STUDY
In this work, we explore the characteristics of oral bacteria and fungi in IMN patients with different tongue coatings, and clarify the therapeutic effect of MSFY based on oral microbiome.
MATERIALS AND METHODS
We enrolled 24 patients with IMN, including 11 with white tongue (IMN-W) and 13 with yellow tongue (IMN-Y), and recruited an additional 10 healthy individuals. Patients with IMN were treated with the MSFY. The oral bacteriome and fungi before and after treatment were detected using full-length 16S rRNA and internal transcribed spacer gene sequencing.
RESULTS
The therapeutic effect of MSFY on patients with yellow tongue coating was more significant than that on patients with white tongue coating. In terms of oral bacteriome, Campylobacter bacteria were enriched in patients with yellow tongue and could be a promising biomarker for yellow coating. Enrichment of Veillonella parvula_A may partially account for the therapeutic effect of MSFY. As for oral fungi, Malassezia globosa was enhanced in patients with IMN-W and reduced in patients with IMN-Y. Notably, it was reduced by MSFY. We also found that mycobiome-bacteriome interactions were highly complex and dynamic in patients with IMN.
CONCLUSION
The regulation of the dynamic balance between oral fungi and bacteria by MSFY contributes to the treatment of IMN. This study determined the oral bacteriome and mycobiome of patients with IMN with different tongue coatings before and after MSFY treatment, which aids in promoting personalized treatment in clinical TCM and provides direction for investigating the mechanism of Chinese herbal medicines.
Topics: Humans; Female; Male; Drugs, Chinese Herbal; Middle Aged; Tongue; Adult; Glomerulonephritis, Membranous; Bacteria; Mycobiome; Aged; Microbiota
PubMed: 38685365
DOI: 10.1016/j.jep.2024.118233 -
Journal of Translational Medicine Apr 2024The aim of this study was to assess the microbial variations and biomarkers in the vaginal and oral environments of patients with human papillomavirus (HPV) and cervical...
BACKGROUND
The aim of this study was to assess the microbial variations and biomarkers in the vaginal and oral environments of patients with human papillomavirus (HPV) and cervical cancer (CC) and to develop novel prediction models.
MATERIALS AND METHODS
This study included 164 samples collected from both the vaginal tract and oral subgingival plaque of 82 women. The participants were divided into four distinct groups based on their vaginal and oral samples: the control group (Z/KZ, n = 22), abortion group (AB/KAB, n = 17), HPV-infected group (HP/KHP, n = 21), and cervical cancer group (CC/KCC, n = 22). Microbiota analysis was conducted using full-length 16S rDNA gene sequencing with the PacBio platform.
RESULTS
The vaginal bacterial community in the Z and AB groups exhibited a relatively simple structure predominantly dominated by Lactobacillus. However, CC group shows high abundances of anaerobic bacteria and alpha diversity. Biomarkers such as Bacteroides, Mycoplasma, Bacillus, Dialister, Porphyromonas, Anaerococcus, and Prevotella were identified as indicators of CC. Correlations were established between elevated blood C-reactive protein (CRP) levels and local/systemic inflammation, pregnancy, childbirth, and abortion, which contribute to unevenness in the vaginal microenvironment. The altered microbial diversity in the CC group was confirmed by amino acid metabolism. Oral microbial diversity exhibited an inverse pattern to that of the vaginal microbiome, indicating a unique relationship. The microbial diversity of the KCC group was significantly lower than that of the KZ group, indicating a link between oral health and cancer development. Several microbes, including Fusobacterium, Campylobacter, Capnocytophaga, Veillonella, Streptococcus, Lachnoanaerobaculum, Propionibacterium, Prevotella, Lactobacillus, and Neisseria, were identified as CC biomarkers. Moreover, periodontal pathogens were associated with blood CRP levels and oral hygiene conditions. Elevated oral microbial amino acid metabolism in the CC group was closely linked to the presence of pathogens. Positive correlations indicated a synergistic relationship between vaginal and oral bacteria.
CONCLUSION
HPV infection and CC impact both the vaginal and oral microenvironments, affecting systemic metabolism and the synergy between bacteria. This suggests that the use of oral flora markers is a potential screening tool for the diagnosis of CC.
Topics: Humans; Female; Microbiota; Vagina; Uterine Cervical Neoplasms; Papillomavirus Infections; Mouth; Adult; Middle Aged; Papillomaviridae; RNA, Ribosomal, 16S; Human Papillomavirus Viruses
PubMed: 38685022
DOI: 10.1186/s12967-024-05124-8