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Frontiers in Microbiology 2022Dysbacteriosis is thought to play an important role in the pathogenesis of necrotizing enterocolitis (NEC). We aimed to identify new biomarkers among gut microbiota and...
BACKGROUND
Dysbacteriosis is thought to play an important role in the pathogenesis of necrotizing enterocolitis (NEC). We aimed to identify new biomarkers among gut microbiota and short-chain fatty acids (SCFAs) for the early prediction of NEC.
MATERIALS AND METHODS
Thirty-four preterm infants with gestational ages of ≤ 34 weeks who developed gastrointestinal symptoms were divided into the NEC group ( = 17) and non-NEC group ( = 17). In the NEC group, the gut microbiota and SCFAs in feces were assessed when the infants were enrolled (Group P) and when they were diagnosed with NEC (Group N). In the non-NEC group, samples were assessed when the infants were enrolled (Group C).
RESULTS
The Ace and Chao1 indices were higher in Group P than in Group C ( < 0.05), and there was no difference between Groups C and N or between Groups P and N ( > 0.05). There was no significant difference in the Simpson and Shannon indices among Groups C, P and N ( > 0.05). The four main phyla showed no differences ( > 0.05) in composition, while at the genus level, compared with Group C, in Group P, , and were increased, while and were decreased ( < 0.05). At the species level, and increased, while decreased ( < 0.05). In Group N, at the genus level, , and increased ( < 0.05). Compared with those in Group C, the levels of acetic acid, propanoic acid and butyric acid decreased significantly in Groups P and N ( < 0.05), and the areas under the curves (AUCs) of these three SCFAs between groups C and P were 0.73, 0.70, and 0.68, respectively.
CONCLUSION
The increase in and and decrease in , as well as the decrease in acetic, propionic and butyric acids, may help in the early prediction of NEC.
PubMed: 36060739
DOI: 10.3389/fmicb.2022.969656 -
Life (Basel, Switzerland) Mar 2023The beneficial effects of balneotherapy have been proven by numerous clinical studies on locomotor disorders. To date, there is only scant data on changes in the...
The beneficial effects of balneotherapy have been proven by numerous clinical studies on locomotor disorders. To date, there is only scant data on changes in the microbiome system of the skin during balneotherapy. The aim of this study was to compare the effects of thermal water and tap water on the skin's microbiome in healthy volunteers. 30 healthy female volunteers participated in the study. The experimental group (of 15 women) spent 30-min 10 times, in Gabriella Spring's thermal baths (i.e., mineral water containing sodium hydrogen carbonate).The controlled group (15 women) had the same, but in tap water. The results of this study have proven that there is a difference in the influencing effects of tap water and medicinal water on the microbiome of the skin. After bathing in the thermal water of Lakitelek, increased significantly at the genus level, and the tendency for bacteria also increased. At the species level, increased significantly, while and the tendency for decreased. When the values of the two trial groups after bathing at the genus level were compared, increased significantly, while tended to increase, tended to decrease, tended to increase significantly, and tended to decrease. At the species level, decreased significantly, and the tendency for decreased. The growth of and the decrease in the tendency of , and confirm the beneficial effect of balneotherapy. In this study, trends are represented by the uncorrected value. The main result was that the thermal water changed certain bacteria of the skin, both on the genus and species levels, but there were no significant changes in the tap water used, either at the genus or species level. We first compared the worlds of thermal water and tap water's microbiome systems. The thermal water decreased the number of certain inflammatory infectious agents and could enhance some of their positive effects, which have been proven at the molecular level. Our results can provide an important clue in the treatment of certain skin diseases. The research of the skin microbiome during balneotherapy can be one of the most intriguing and exciting topics of the future and can bring us closer to understanding the mechanism of action of balneotherapy.
PubMed: 36983902
DOI: 10.3390/life13030746 -
Frontiers in Microbiology 2023Cardiac surgery-associated acute kidney injury (CSA-AKI) is a common hospital-acquired AKI that carries a grave disease burden. Recently, gut-kidney crosstalk has...
INTRODUCTION
Cardiac surgery-associated acute kidney injury (CSA-AKI) is a common hospital-acquired AKI that carries a grave disease burden. Recently, gut-kidney crosstalk has greatly changed our understanding of the pathogenesis of kidney diseases. However, the relationship between gut microbial dysbiosis and CSA-AKI remains unclear. The purpose of this study was to investigate the possible contributions of gut microbiota alterations in CSA-AKI patients.
METHODS
Patients undergoing cardiac surgery were enrolled and divided into acute kidney injury (AKI) and Non_AKI groups. Faecal samples were collected before the operation. Shotgun metagenomic sequencing was performed to identify the taxonomic composition of the intestinal microbiome. All groups were statistically compared with alpha- and beta-diversity analysis, and linear discriminant analysis effect size (LEfSe) analysis was performed.
RESULTS
A total of 70 individuals comprising 35 AKI and 35 Non_AKI were enrolled in the study. There was no significant difference between the AKI and Non_AKI groups with respect to the alpha-and beta-diversity of the Shannon index, Simpson or Chao1 index values except with respect to functional pathways ( < 0.05). However, the relative abundance of top 10 gut microbiota in CSA-AKI was different from the Non_AKI group. Interestingly, both LEfSe and multivariate analysis confirmed that the species , , and were associated with CSA-AKI. Moreover, correlation heat map indicated that altered pathways and disrupted function could be attributed to disturbances of gut microbiota involving .
CONCLUSION
Dysbiosis of the intestinal microbiota in preoperative stool affects susceptibility to CSA-AKI, indicating the crucial role of key microbial players in the development of CSA-AKI. This work provides valuable knowledge for further study of the contribution of gut microbiota in CSA-AKI.
PubMed: 37065117
DOI: 10.3389/fmicb.2023.1119959 -
Indian Journal of Pathology &... 2022Adenocarcinoma is a more common type of Non-small cell lung cancer (NSCLC). Lung cancer showed a statistically significant increment in the Kamrup Urban district of...
BACKGROUND
Adenocarcinoma is a more common type of Non-small cell lung cancer (NSCLC). Lung cancer showed a statistically significant increment in the Kamrup Urban district of Assam, Tripura, Sikkim, and Manipur of India. The goal of our pilot study is to identify non-invasive microbial biomarkers to detect lung adenocarcinoma (LAC).
MATERIAL AND METHODS
DNA extraction from saliva samples of five LAC patients and five healthy controls was performed by Qiagen DNeasy blood and tissue kit using Lysozyme (3mg/ml) treatment. 16S rRNA genes of distinct regions (V3-V4) were amplified from saliva DNA by PCR. Paired-end sequencing targeting the V3-V4 region of the 16S rRNA gene has been performed on the Illumina MiSeq platform. Raw sequences were analyzed using the QIIME(Quantitative Insights Into Microbial Ecology) software package.
RESULTS
Our preliminary results showed that Rothia mucilaginosa, Veillonella dispar, Prevotella melaninogenica, Prevotella pallens, Prevotella copri, Haemophilus parainfluenzae, Neisseria bacilliformis and Aggregatibacter segnis were significantly elevated in saliva of LAC which may serve as potential non-invasive biomarkers for LAC detection. Functional prediction analysis showed that bacterial genes involved in glycosyltransferase, peptidases, amino sugar, and nucleotide sugar metabolism, starch and sucrose metabolism were significantly enriched in LAC.
CONCLUSION
These salivary bacteria may contribute to the development of LAC by increasing expression of glycosyltransferase and peptidases. However to understand their role in pathobiology, studies are required to perform in large cohort.
Topics: Adenocarcinoma of Lung; Bacteria; Biomarkers, Tumor; DNA, Bacterial; Dysbiosis; Female; Humans; India; Male; Microbiota; Middle Aged; Pilot Projects; RNA, Ribosomal, 16S; Saliva
PubMed: 35074976
DOI: 10.4103/IJPM.IJPM_1111_20 -
Kidney Research and Clinical Practice Sep 2015Rothia muciliaginosa (R. mucilaginosa) is a facultative, Gram-positive coccus that is considered to be part of the normal flora of the mouth and respiratory tract. There...
Rothia muciliaginosa (R. mucilaginosa) is a facultative, Gram-positive coccus that is considered to be part of the normal flora of the mouth and respiratory tract. There are sporadic reports of the organism causing endocarditis in patients with heart valve abnormalities, as well as meningitis, septicemia, and pneumonia associated with intravenous drug abuse. However, it is an unusual pathogen in cases of peritoneal dialysis (PD)-associated peritonitis. Although R. mucilaginosa is generally susceptible to penicillin, ampicillin, cefotaxime, imipenem, rifampicin, and glycopeptides, there are no guidelines for the treatment of PD-associated peritonitis. Herein, we report a case of PD-associated peritonitis due to R. mucilaginosa that was resolved with intraperitoneal antibiotic treatment.
PubMed: 26484045
DOI: 10.1016/j.krcp.2015.02.005 -
Scientific Reports Apr 2018Little is known about the effect of long-term diet patterns on the composition and functional potential of the human salivary microbiota. In the present study, we sought... (Comparative Study)
Comparative Study
Little is known about the effect of long-term diet patterns on the composition and functional potential of the human salivary microbiota. In the present study, we sought to contribute to the ongoing elucidation of dietary effects on the oral microbial community by examining the diversity, composition and functional potential of the salivary microbiota in 160 healthy vegans and omnivores using 16S rRNA gene amplicon sequencing. We further sought to identify bacterial taxa in saliva associated with host inflammatory markers. We show that compositional differences in the salivary microbiota of vegans and omnivores is present at all taxonomic levels below phylum level and includes upper respiratory tract commensals (e.g. Neisseria subflava, Haemophilus parainfluenzae, and Rothia mucilaginosa) and species associated with periodontal disease (e.g. Campylobacter rectus and Porphyromonas endodontalis). Dietary intake of medium chain fatty acids, piscine mono- and polyunsaturated fatty acids, and dietary fibre was associated with bacterial diversity, community structure, as well as relative abundance of several species-level operational taxonomic units. Analysis of imputed genomic potential revealed several metabolic pathways differentially abundant in vegans and omnivores indicating possible effects of macro- and micro-nutrient intake. We also show that certain oral bacteria are associated with the systemic inflammatory state of the host.
Topics: Adult; Bacteria; DNA, Bacterial; Diet, Vegan; Feeding Behavior; Healthy Volunteers; Humans; Metabolic Networks and Pathways; Microbiota; RNA, Ribosomal, 16S; Saliva; Young Adult
PubMed: 29643500
DOI: 10.1038/s41598-018-24207-3 -
Frontiers in Microbiology 2021The presence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been recently demonstrated in the sputum or saliva, suggesting how the shedding of viral...
The presence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been recently demonstrated in the sputum or saliva, suggesting how the shedding of viral RNA outlasts the end of symptoms. Recent data from transcriptome analysis show that the oral cavity mucosa harbors high levels of angiotensin-converting enzyme 2 (ACE2) and transmembrane protease, serine 2 (TMPRSS2), highlighting its role as a double-edged sword for SARS-CoV-2 body entrance or interpersonal transmission. Here, we studied the oral microbiota structure and inflammatory profile of 26 naive severe coronavirus disease 2019 (COVID-19) patients and 15 controls by 16S rRNA V2 automated targeted sequencing and magnetic bead-based multiplex immunoassays, respectively. A significant diminution in species richness was observed in COVID-19 patients, along with a marked difference in beta-diversity. Species such as and were distinctive for COVID-19 patients, while and were predominant in controls. Interestingly, these two groups of oral species oppositely clustered within the bacterial network, defining two distinct Species Interacting Groups (SIGs). COVID-19-related pro-inflammatory cytokines were found in both oral and serum samples, along with a specific bacterial consortium able to counteract them. We introduced a new parameter, named CytoCOV, able to predict COVID-19 susceptibility for an unknown subject at 71% of power with an Area Under Curve (AUC) equal to 0.995. This pilot study evidenced a distinctive oral microbiota composition in COVID-19 subjects, with a definite structural network in relation to secreted cytokines. Our results would be usable in clinics against COVID-19, using bacterial consortia as biomarkers or to reduce local inflammation.
PubMed: 34394024
DOI: 10.3389/fmicb.2021.671813 -
Scientific Reports Mar 2018The small bowel is responsible for most of the body's nutritional uptake and for the development of intestinal and systemic tolerance towards microbes. Nevertheless, the...
The small bowel is responsible for most of the body's nutritional uptake and for the development of intestinal and systemic tolerance towards microbes. Nevertheless, the human small bowel microbiota has remained poorly characterized, mainly owing to sampling difficulties. Sample collection directly from the distal ileum was performed during radical cystectomy with urinary diversion. Material from the ileal mucosa were analysed using massive parallel sequencing of the 16S rRNA gene. Samples from 27 Caucasian patients were included. In total 280 unique Operational Taxonomic Units were identified, whereof 229 could be assigned to a species or a species group. The most frequently detected bacteria belonged to the genera Streptococcus, Granulicatella, Actinomyces, Solobacterium, Rothia, Gemella and TM7(G-1). Among these, the most abundant species were typically streptococci within the mitis and sanguinis groups, Streptococcus salivarius, Rothia mucilaginosa and Actinomyces from the A. meyeri/odontolyticus group. The amounts of Proteobacteria and strict anaerobes were low. The microbiota of the distal part of the human ileum is oral-like and strikingly different from the colonic microbiota. Although our patient population is elderly and hospitalized with a high prevalence of chronic conditions, our results provide new and valuable insights into a lesser explored part of the human intestinal ecosystem.
Topics: Aged; Aged, 80 and over; Bacteria; DNA, Bacterial; Female; Humans; Ileum; Male; Microbiota; Middle Aged; Phylogeny; RNA, Ribosomal, 16S
PubMed: 29549283
DOI: 10.1038/s41598-018-23198-5 -
NPJ Biofilms and Microbiomes Jul 2021The human oral and gut commensal microbes play vital roles in the development and maintenance of immune homeostasis, while its association with susceptibility and...
The human oral and gut commensal microbes play vital roles in the development and maintenance of immune homeostasis, while its association with susceptibility and severity of SARS-CoV-2 infection is barely understood. In this study, we investigated the dynamics of the oral and intestinal flora before and after the clearance of SARS-CoV-2 in 53 COVID-19 patients, and then examined their microbiome alterations in comparison to 76 healthy individuals. A total of 140 throat swab samples and 81 fecal samples from these COVID-19 patients during hospitalization, and 44 throat swab samples and 32 fecal samples from sex and age-matched healthy individuals were collected and then subjected to 16S rRNA sequencing and viral load inspection. We found that SARS-CoV-2 infection was associated with alterations of the microbiome community in patients as indicated by both alpha and beta diversity indexes. Several bacterial taxa were identified related to SARS-CoV-2 infection, wherein elevated Granulicatella and Rothia mucilaginosa were found in both oral and gut microbiome. The SARS-CoV-2 viral load in those samples was also calculated to identify potential dynamics between COVID-19 and the microbiome. These findings provide a meaningful baseline for microbes in the digestive tract of COVID-19 patients and will shed light on new dimensions for disease pathophysiology, potential microbial biomarkers, and treatment strategies for COVID-19.
Topics: Bacteria; COVID-19; Feces; Female; Gastrointestinal Microbiome; Hospitalization; Humans; Male; Mouth; RNA, Ribosomal, 16S; SARS-CoV-2; Viral Load
PubMed: 34294722
DOI: 10.1038/s41522-021-00232-5 -
Water Research Oct 2021Reconditioning of food processing water streams for reuse is an increasingly common water management practice in the food industry and UV disinfection is often employed...
Reconditioning of food processing water streams for reuse is an increasingly common water management practice in the food industry and UV disinfection is often employed as part of the water treatment. Several factors may impact the effect of UV radiation. Here, we aim to assess the impact of cell aggregation on UV inactivation kinetics and investigate if UV exposure induces aggregation. Three strains, isolated from food processing water reuse lines (Raoultella ornithinolytica, Pseudomonas brenneri, Rothia mucilaginosa) and both an aggregating and a non-aggregating strain of Staphylococcus aureus were exposed to UVC light at 255 nm using UV LED equipment. Total Viable Count and phase-contrast microscopy, coupled with image analysis, were used to compare the UV inactivation kinetics with the average particle size for a range of UV doses. Tailing effect, seen as a strong reduction in inactivation rate, was observed for all strains at higher UV doses (industrial strains ≥ 50 or 120 mJ/cm, S. aureus strains ≥ 40 or 60 mJ/cm). The naturally aggregating strains were more UV tolerant, both within and between species. When aggregates of S. aureus were broken, UV tolerance decreased. For the processing water isolates, the lowest applied UV dose (25 mJ/cm) significantly increased the average particle size. Application of higher UV doses obtained with longer exposure times did not further increase the particle size compared with untreated samples. For the S. aureus strains, however, no consistent change in average particle size was observed due to UV. Our results demonstrate that aggregating strains have a higher degree of protection and that UV radiation induces aggregation in some, but not all bacteria. A better understanding of the mechanisms governing microbial aggregation and survival during UV treatment could help to improve UV applications and predictions of microbial inactivation.
Topics: Bacteria; Disinfection; Enterobacteriaceae; Kinetics; Micrococcaceae; Pseudomonas; Staphylococcus aureus; Ultraviolet Rays
PubMed: 34482094
DOI: 10.1016/j.watres.2021.117593