scholarly journals Characterization of the Luminal and Mucosa-Associated Microbiome along the Gastrointestinal Tract: Results from Surgically Treated Preterm Infants and a Murine Model

Nutrients ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 1030
Author(s):  
Ingeborg Klymiuk ◽  
Georg Singer ◽  
Christoph Castellani ◽  
Slave Trajanoski ◽  
Beate Obermüller ◽  
...  
Keyword(s):  
Individual Differences ◽  
Gastrointestinal Tract ◽  
Preterm Infants ◽  
Bacterial Colonization ◽  
Statistical Significance ◽  
Small Sample ◽  
Intestinal Microbiome ◽  
Gi Tract ◽  
Microbial Composition

Environmental factors, including nutritional habits or birth mode, are known key determinants for intestinal microbial composition. Investigations of the intestinal microbiome in different species in a multiplicity of studies during recent decades have revealed differential microbial patterns and quantities along the gastrointestinal (GI) tract. Characterization of the microbial pattern in various aspects is a prerequisite for nutritional interventions. In this 16S rRNA amplicon-based approach, we present a characterization of the mucosa-associated microbiome in comparison with the luminal community of four infants at the time of the closure of ileostomies and perform a systematic characterization of the corresponding luminal and mucosal microbiome from jejunal, ileal and colonic regions, as well as collected feces in mice. The most dominant taxa in infant-derived samples altered due to individual differences, and in the mucosa, Enterococcus, Clostridiumsensustricto1, Veillonella, Streptococcus and Staphylococcus were the most abundant. Two less abundant taxa differed significantly between the mucosa and lumen. In murine samples, relative abundances differed significantly, mainly between the intestinal regions. Significant differences between mouse mucosa- and lumen-derived samples could be found in the observed species with a trend to lower estimated diversity in mucosa-derived samples, as well as in the relative abundance of individual taxa. In this study, we examined the difference between the mucosal and luminal bacterial colonization of the gastrointestinal tract in a small sample cohort of preterm infants. Individual differences were characterized and statistical significance was reached in two taxa (Cupriavidus, Ralstonia). The corresponding study on the different murine intestinal regions along the GI tract showed differences all over the intestinal region.

scholarly journals Bacterial Colonization within the First Six Weeks of Life and Pulmonary Outcome in Preterm Infants <1000 g

2020 ◽  
Vol 9 (7) ◽  
pp. 2240
Author(s):  
Tina Lauer ◽  
Judith Behnke ◽  
Frank Oehmke ◽  
Johanna Baecker ◽  
Katrin Gentil ◽  
...  
Keyword(s):  
Mechanical Ventilation ◽  
Gastrointestinal Tract ◽  
Preterm Infants ◽  
Bacterial Colonization ◽  
Statistical Significance ◽  
Upper Airway ◽  
Oxygen Toxicity ◽  
Pathogenic Potential ◽  
The Impact ◽  
Airway Colonization

Bronchopulmonary dysplasia (BPD) is a multifactorial disease mainly provoked by pre- and postnatal infections, mechanical ventilation, and oxygen toxicity. In severely affected premature infants requiring mechanical ventilation, association of bacterial colonization of the lung and BPD was recently disclosed. To analyze the impact of bacterial colonization of the upper airway and gastrointestinal tract on moderate/severe BPD, we retrospectively analyzed nasopharyngeal and anal swabs taken weekly during the first 6 weeks of life at a single center in n = 102 preterm infants <1000 g. Colonization mostly occurred between weeks 2 and 6 and displayed a high diversity requiring categorization. Analyses of deviance considering all relevant confounders revealed statistical significance solely for upper airway colonization with bacteria with pathogenic potential and moderate/severe BPD (p = 0.0043) while no link could be established to the Gram response or the gastrointestinal tract. Our data highlight that specific colonization of the upper airway poses a risk to the immature lung. These data are not surprising taking into account the tremendous impact of microbial axes on health and disease across ages. We suggest that studies on upper airway colonization using predefined categories represent a feasible approach to investigate the impact on the pulmonary outcome in ventilated and non-ventilated preterm infants.

scholarly journals Levels of Growth Factors and IgA in the Colostrum of Women from Burundi and Italy

Nutrients ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1216 ◽  
Author(s):  
Daniel Munblit ◽  
Priya Abrol ◽  
Shreya Sheth ◽  
Li Chow ◽  
Ekaterina Khaleva ◽  
...  
Keyword(s):  
Growth Factor ◽  
Transforming Growth Factor ◽  
Clinical Chemistry ◽  
Statistical Significance ◽  
Univariate Analysis ◽  
Small Sample ◽  
Statistical Testing ◽  
Strong Positive Correlation ◽  
Microbial Composition ◽  
Immune System Development

Colostrum is produced in the first days postpartum. It is a known source of immune mediators for a newborn within the first week of life. Although it is still unclear if colostrum composition varies between populations, recent data suggest differences. Hepatocyte growth factor (HGF); transforming growth factor-β (TGF-β) 1, 2, and 3; and immunoglobulin A (IgA) are key immunological components of colostrum that stimulate neonatal gastrointestinal and immune system development. We aimed to investigate the differences in the concentration between immune markers in the colostrum of mothers living in Burundi and Italy, and to identify the factors associated with differences. In this cross-sectional birth cohort study, a total of 99 colostrum samples from Burundian (n = 23) and Italian (n = 76) women were collected at 0 to 6 days postpartum. A clinical chemistry analyser was used for IgA quantification and electro-chemiluminescence, for HGF and TGFβ1-3 assessment. A univariate analysis and multivariate linear regression model were used for statistical testing. The concentrations of TGF-β2 (p = 0.01) and IgA (p < 0.01) were significantly higher in the colostrum from the women residing in Burundi than in Italy, both in a univariate analysis and upon the adjustment for confounding factors. A similar trend is seen for HGF, reaching statistical significance upon a multivariate analysis. We found a moderate to strong positive correlation between the TGF-β isoforms and IgA concentration in both countries (p < 0.01), with stronger concentration in the colostrum from Burundi. The results of this study are in support of previous data, suggesting that concentration of the immune active molecules is higher in the human milk of women residing in developing countries. However, with a small sample size, caution must be applied, as the findings require further confirmation. Future work should also be focused on other factors (e.g., lipid and microbial composition), as well as the investigation into colostrum and between populations comparison, adjusting for potential confounders.

scholarly journals Spatial and Temporal Analysis of the Stomach and Small-Intestinal Microbiota in Fasted Healthy Humans

mSphere ◽  
2019 ◽  
Vol 4 (2) ◽  
Author(s):  
Anna M. Seekatz ◽  
Matthew K. Schnizlein ◽  
Mark J. Koenigsknecht ◽  
Jason R. Baker ◽  
William L. Hasler ◽  
...  
Keyword(s):  
Gastrointestinal Tract ◽  
Upper Gastrointestinal Tract ◽  
Rrna Gene ◽  
Gi Tract ◽  
Microbial Composition ◽  
Content Type ◽  
Healthy Humans ◽  
Health And Disease ◽  
Upper Gastrointestinal ◽  
Over Time

ABSTRACTAlthough the microbiota in the proximal gastrointestinal (GI) tract have been implicated in health and disease, much about these microbes remains understudied compared to those in the distal GI tract. This study characterized the microbiota across multiple proximal GI sites over time in healthy individuals. As part of a study of the pharmacokinetics of oral mesalamine administration, healthy, fasted volunteers (n = 8; 10 observation periods total) were orally intubated with a four-lumen catheter with multiple aspiration ports. Samples were taken from stomach, duodenal, and multiple jejunal sites, sampling hourly (≤7 h) to measure mesalamine (administered att = 0), pH, and 16S rRNA gene-based composition. We observed a predominance ofFirmicutesacross proximal GI sites, with significant variation compared to stool. The microbiota was more similar within individuals over time than between subjects, with the fecal microbiota being unique from that of the small intestine. The stomach and duodenal microbiota displayed highest intraindividual variability compared to jejunal sites, which were more stable across time. We observed significant correlations in the duodenal microbial composition with changes in pH; linear mixed models identified positive correlations with multipleStreptococcusoperational taxonomic units (OTUs) and negative correlations with multiplePrevotellaandPasteurellaceaeOTUs. Few OTUs correlated with mesalamine concentration. The stomach and duodenal microbiota exhibited greater compositional dynamics than the jejunum. Short-term fluctuations in the duodenal microbiota were correlated with pH. Given the unique characteristics and dynamics of the proximal GI tract microbiota, it is important to consider these local environments in health and disease states.IMPORTANCEThe gut microbiota are linked to a variety of gastrointestinal diseases, including inflammatory bowel disease. Despite this importance, microbiota dynamics in the upper gastrointestinal tract are understudied. Our article seeks to understand what factors impact microbiota dynamics in the healthy human upper gut. We found that the upper gastrointestinal tract contains consistently prevalent bacterial OTUs that dominate the overall community. Microbiota variability is highest in the stomach and duodenum and correlates with pH.

Breath hydrogen in preterm infants: Correlation with changes in bacterial colonization of the gastrointestinal tract

1982 ◽  
Vol 101 (4) ◽  
pp. 607-610 ◽  
Author(s):  
David K. Stevenson ◽  
Susan M. Shahin ◽  
Clinton R. Ostrander ◽  
John A. Kerner ◽  
Ronald S. Cohen ◽  
...  
Keyword(s):  
Gastrointestinal Tract ◽  
Preterm Infants ◽  
Bacterial Colonization ◽  
Breath Hydrogen

scholarly journals The present conception of neonatal microbiome formation

2021 ◽  
Vol 9 (1) ◽  
pp. 18-28
Author(s):  
S.V. Popov ◽  
O.I. Smiian ◽  
A.O. Profatylo
Keyword(s):  
Gastrointestinal Tract ◽  
Neonatal Period ◽  
Bacterial Colonization ◽  
Mode Of Delivery ◽  
Normal Pregnancy ◽  
Microbial Colonization ◽  
Metagenomic Sequencing ◽  
Microbial Composition ◽  
Amniotic Cavity ◽  
Clinically Significant

The neonatal period is critical in the development of the microbiome and the gastrointestinal tract. That is, the microbiome regulates not only the processes that are associated with the basic functions of the gastrointestinal tract, but is associated with the content of vitamins and micronutrients, affects the development of the nervous and endocrine systems of newborns. Fortunately, microbiome and immunity of pregnant get ready the infant for his inevitable complications. Although preterm birth has been connected with bacterial colonization of the amniotic cavity for many years, the dogma of a sterile intrauterine environment during a normal pregnancy has appeared only recently. Numerous placental microbiome and the occurrence of microorganisms in the amniotic cavity in normal pregnancy was demonstrated by metagenomic sequencing. The occurrence of microorganisms in intestine got from the operating room during resection of intestinal abnormalities immediately after birth and before feeding was also found in neonates born by caesarean section. In this literature review, we explore the update understanding of microbial colonization of the intestine and foundation of function of the gastrointestinal tract. We discuss how mother’s genital and extragenital pathologies, her diet, lifestyle, taking drugs during pregnancy form the microbiome of the fetus and its further development in the neonatal period. Also, equally important for the establishment of the neonatal microbiome are gestational age, mode of delivery, type of feeding and medication, including antibiotics. Therefore, in our opinion, the comparison of microbiota of a full-term newborn in vaginal birth and an infant born prematurely or by cesarean section is clinically significant for physicians in various fields. The study of changes in the microbial composition of the intestine is an important step in the diagnosis of pathological conditions in this period.

scholarly journals Microrheological characterization of covalent adaptable hydrogel degradation in response to temporal pH changes that mimic the gastrointestinal tract

Soft Matter ◽  
2020 ◽  
Vol 16 (27) ◽  
pp. 6253-6258
Author(s):  
Nan Wu ◽  
Kelly M. Schultz
Keyword(s):  
Gastrointestinal Tract ◽  
Oral Delivery ◽  
Gi Tract ◽  
Delivery Vehicle ◽  
Experimental Platform ◽  
Ph Changes

This work provides a new experimental platform to simultaneously mimic the pH environment in the GI tract and characterize the degradation of a covalent adaptable hydrogel to determine viability of this material as an oral delivery vehicle.

Combination of AST to ALT and neutrophils to lymphocytes ratios as predictors of locally advanced disease in patients with bladder cancer subjected to radical cystectomy: Results from a single-institutional series

2021 ◽  
pp. 039156032110351
Author(s):  
Alessandro Uleri ◽  
Rodolfo Hurle ◽  
Roberto Contieri ◽  
Pietro Diana ◽  
Nicolòmaria Buffi ◽  
...  
Keyword(s):  
Bladder Cancer ◽  
Radical Cystectomy ◽  
Advanced Disease ◽  
Independent Predictor ◽  
Small Sample Size ◽  
Statistical Significance ◽  
Locally Advanced ◽  
Small Sample ◽  
Locally Advanced Disease ◽  
Increased Risk

Background: Bladder cancer (BC) staging is challenging. There is an important need for available and affordable predictors to assess, in combination with imaging, the presence of locally-advanced disease. Objective: To determine the role of the De Ritis ratio (DRR) and neutrophils to lymphocytes ratio (NLR) in the prediction of locally-advanced disease defined as the presence of extravescical extension (pT ⩾ 3) and/or lymph node metastases (LNM) in patients with BC treated with radical cystectomy (RC). Methods: We retrospectively analyzed clinical and pathological data of 139 consecutive patients who underwent RC at our institution. Logistic regression models (LRMs) were fitted to test the above-mentioned outcomes. Results: A total of 139 consecutive patients underwent RC at our institution. Eighty-six (61.9%) patients had a locally-advanced disease. NLR (2.53 and 3.07; p = 0.005) and DRR (1 and 1.17; p = 0.01) were significantly higher in patients with locally-advanced disease as compared to organ-confined disease. In multivariable LRMs, an increasing DRR was an independent predictor of locally-advanced disease (OR = 3.91; 95% CI: 1.282–11.916; p = 0.017). Similarly, an increasing NLR was independently related to presence of locally-advanced disease (OR = 1.28; 95% CI: 1.027–1.591; p = 0.028). In univariate LRMs, patients with DRR > 1.21 had a higher risk of locally advanced disease (OR = 2.83; 95% CI: 1.312–6.128; p = 0.008). Similarly, in patients with NLR > 3.47 there was an increased risk of locally advanced disease (OR = 3.02; 95% CI: 1.374–6.651; p = 0.006). In multivariable LRMs, a DRR > 1.21 was an independent predictor of locally advanced disease (OR = 2.66; 95% CI: 1.12–6.35; p = 0.027). Similarly, an NLR > 3.47 was independently related to presence of locally advanced disease (OR = 2.24; 95% CI: 0.95–5.25; p = 0.065). No other covariates such as gender, BMI, neoadjuvant chemotherapy or diabetes reached statistical significance. The AUC of the multivariate LRM to assess the risk of locally advanced disease was 0.707 (95% CI: 0.623–0.795). Limitations include the retrospective nature of the study and the relatively small sample size.

Characterization of lung ultrasound imaging in preterm infants with bronchopulmonary dysplasia

2021 ◽  
pp. 1-13
Author(s):  
Ying-Hua Sun ◽  
Lin Yuan ◽  
Yang Du ◽  
Jian-Guo Zhou ◽  
Sam Bill Lin ◽  
...  
Keyword(s):  
Preterm Infants ◽  
Bronchopulmonary Dysplasia ◽  
Neonatal Intensive Care ◽  
Lung Ultrasound ◽  
Imaging Method ◽  
Chronic Lung Diseases ◽  
Pleural Line ◽  
Ultrasound Features

BACKGROUND: Lung ultrasound (LUS) is a bedside technique that can be used on diagnosis and follow-up of neonatal respiratory diseases. However, there are rare reports on the ultrasound features of bronchopulmonary dysplasia (BPD) which is one of the most common chronic lung diseases in preterm infants. OBJECTIVE: To describe the ultrasound features of different BPD levels, and to investigate the value of ultrasound in evaluating moderate-to-severe BPD. METHODS: In this prospective cohort study, newborns of less than 37 weeks’ gestational age in neonatal intensive care unit (NICU) were included. The LUS characteristics including pleural line, alveolar-interstitial syndrome (AIS), retrodiaphragmatic hyperechogenicity and diaphragmatic morphology were observed and recorded. The reliability of LUS in evaluating moderate and severe BPD were compared and calculated. RESULTS: A total of 108 infants were enrolled in our study: 39, 24, 29, 16 infants had non, mild, moderate and severe BPD. The median(IQR) pleura thickness in the moderate-to-severe BPD group was 1.7(1.6–1.85) mm, which was thicker than that in the none-to-mild BPD infants (P <  0.001), meanwhile the proportions of rough pleural lines, diffuse AIS, retrodiaphragmatic hyperechogenicity, small cysts above the diaphragm and rough diaphragm in the moderate-to-severe BPD group were also higher than those in none-to-mild BPD group (86.7% vs 36.5, 57.8% vs 7.9%, 37.8% vs 0, 33.3% vs 0, P <  0.001). In evaluating moderate-to-severe BPD, rough pleura had 91.1% (95% confidence interval [CI]: 0.793–0.965) in sensitivity, 91.3% (95% CI: 0.797–0.966) in negative predictive value (NPV), and 66.7% (95% CI: 0.544–0.771) in specificity. Small cysts had 100% (95% CI: 0.941-1) in specificity, 100% (95% CI: 0.816-1) in PPV, and 37.8% in sensitivity (95% CI: 0.251–0.524). Rough diaphragm had 100% (95% CI: 0.943-1) in sensitivity, 100% (95% CI: 0.796-1) in PPV and 33.3% (95% CI: 0.211–0.478) in specificity. CONCLUSIONS: Depending on its unique advantages such as convenient, no radiation and repeatable, LUS is a valuable imaging method in assessing the severity of BPD, especially in moderate and severe BPD.

Sign in / Sign up

Export Citation Format

Share Document