The study intended to assess the level of pollution of potential toxic elements (PTEs) at different soil depths and to evaluate the source contribution in agricultural soil. One hundred and two soil samples were collected for both topsoil (51), and the subsoil (51) and the content of PTEs (Cr, Cu, Cd, Mn, Ni, Pb, As and Zn) were determined using inductively coupled plasma-optical emission spectroscopy (ICP-OES). The concentrations of Zn and Cd in both soil horizons indicated that the current study levels were higher than the upper continental crust (UCC), world average value (WAV), and European average values (EAV). Nonetheless, the concentration values of PTEs such as Mn and Cu for EAV, As, Cu, Mn, and Pb for UCC, and Pb for WAV were lower than the average values of the corresponding PTEs in this study. The single pollution index, enrichment factor, and ecological risk revealed that the pollution level ranged from low to high. The pollution load index, Nemerow pollution index, and risk index all revealed that pollution levels ranged from low to high. The spatial distribution confirmed that pollution levels varied between the horizons; that is, the subsoil was considered slightly more enriched than the topsoil. Principal component analysis identified the PTE source as geogenic (i.e. for Mn, Cu, Ni, Cr) and anthropogenic (i.e. for Pb, Zn, Cd, and As). PTEs were attributed to various sources using enrichment factor-positive matrix factorization (EF-PMF) and positive matrix factorization (PMF), including geogenic (e.g. rock weathering), fertilizer application, steel industry, industrial sewage irrigation, agrochemicals, and metal works. Both receptor models allotted consistent sources for the PTEs. Multiple linear regression analysis was applied to the receptor models (EF-PMF and PMF), and their efficiency was tested and assessed using root-mean-square error (RMSE), mean absolute error (MAE), and R2 accuracy indicators. The validation and accuracy assessment of the receptor models revealed that the EF-PMF receptor model output significantly reduces errors compared with the parent model PMF. Based on the marginal error levels in RMSE and MAE, 7 of the 8 PTEs (As, Cd, Cr, Cu, Ni, Mn, Pb, and Zn) analysed performed better under the EF-PMF receptor model. The EF-PMF receptor model optimizes the efficiency level in source apportionment, reducing errors in determining the proportion contribution of PTEs in each factor. The purpose of building a model is to maximize efficiency while minimizing inaccuracy. The marginal error limitation encountered in the parent model PMF was circumvented by EF-PMF. As a result, EF-PMF is feasible and useful for apparently polluted environments, whether farmland, urban land, or peri-urban land.
- Keywords
- Enrichment factor-positive matrix factorization, Frýdek-Místek District, Multiple linear regression, Potentially toxic elements, Principal component analysis, Spatial distribution,
- MeSH
- Risk Assessment MeSH
- Cadmium analysis MeSH
- Soil Pollutants * analysis MeSH
- Environmental Monitoring methods MeSH
- Lead analysis MeSH
- Soil chemistry MeSH
- Metals, Heavy * analysis MeSH
- Publication type
- Journal Article MeSH
- Geographicals
- China MeSH
- Names of Substances
- Cadmium MeSH
- Soil Pollutants * MeSH
- Lead MeSH
- Soil MeSH
- Metals, Heavy * MeSH
Excessive use of antibiotics contributes to the selection of resistant bacteria and intestinal colonization with multiresistant pathogens poses a risk factor for subsequent infections. The present study assessed vancomycin-resistant enterococci (VRE) carriage rates in patients admitted to our tertiary care hospital. Stool samples sent for routine culturing were screened with vancomycin containing solid or broth enrichment media. VRE isolates were identified with matrix-assisted laser desorption/ionization-time of flight mass spectrometry and antibiotic susceptibilities were tested by E-test. Vancomycin resistance genes were detected by polymerase chain reaction. Medical records of carriers were examined for suspected risk factors for colonization. Altogether 3025 stool specimens were analyzed. Solid media identified a VRE carriage rate of 2.2% while broth enrichment detected 5.8%. Seventy percent of the isolates were Enterococcus faecium. VanB genotype was detected in 38.2%, VanA in 37.3%, VanC1 in 22.6%, and VanC2 in 1.9%. All VRE were sensitive to linezolid, daptomycin, and tigecycline. Collective risk factors for carriage were diabetes, normal flora absence, Clostridioides difficile positivity, longer hospital stay, and advanced age. 78.5% of the carriers received antibiotic therapy which was metronidazole in most cases (47.3%). We recommend regular screening of risk groups such as patients with diabetes, history of recent hospitalization, or former C. difficile infection as an imperative step for preventing VRE dissemination.
- Keywords
- Antibiotic resistance, MALDI-TOF, PCR, Risk factors, VRE carriage,
- MeSH
- Anti-Bacterial Agents pharmacology therapeutic use MeSH
- Tertiary Care Centers MeSH
- Child MeSH
- Adult MeSH
- Vancomycin-Resistant Enterococci isolation & purification MeSH
- Feces microbiology MeSH
- Genotype MeSH
- Gram-Positive Bacterial Infections drug therapy epidemiology microbiology MeSH
- Middle Aged MeSH
- Humans MeSH
- Microbial Sensitivity Tests MeSH
- Adolescent MeSH
- Young Adult MeSH
- Child, Preschool MeSH
- Carrier State epidemiology microbiology MeSH
- Retrospective Studies MeSH
- Vancomycin Resistance genetics MeSH
- Risk Factors MeSH
- Aged, 80 and over MeSH
- Aged MeSH
- Intestines microbiology MeSH
- Check Tag
- Child MeSH
- Adult MeSH
- Middle Aged MeSH
- Humans MeSH
- Adolescent MeSH
- Young Adult MeSH
- Male MeSH
- Child, Preschool MeSH
- Aged, 80 and over MeSH
- Aged MeSH
- Female MeSH
- Publication type
- Journal Article MeSH
- Geographicals
- Hungary epidemiology MeSH
- Names of Substances
- Anti-Bacterial Agents MeSH
The Epstein-Barr virus (EBV) is found almost exclusively in the activated B-cell (ABC) subtype of diffuse large B-cell lymphoma (DLBCL), yet its contribution to this tumour remains poorly understood. We have focused on the EBV-encoded latent membrane protein-1 (LMP1), a constitutively activated CD40 homologue expressed in almost all EBV-positive DLBCLs and which can disrupt germinal centre (GC) formation and drive lymphomagenesis in mice. Comparison of the transcriptional changes that follow LMP1 expression with those that follow transient CD40 signalling in human GC B cells enabled us to define pathogenic targets of LMP1 aberrantly expressed in ABC-DLBCL. These included the down-regulation of S1PR2, a sphingosine-1-phosphate (S1P) receptor that is transcriptionally down-regulated in ABC-DLBCL, and when genetically ablated leads to DLBCL in mice. Consistent with this, we found that LMP1-expressing primary ABC-DLBCLs were significantly more likely to lack S1PR2 expression than were LMP1-negative tumours. Furthermore, we showed that the down-regulation of S1PR2 by LMP1 drives a signalling loop leading to constitutive activation of the phosphatidylinositol-3-kinase (PI3-K) pathway. Finally, core LMP1-PI3-K targets were enriched for lymphoma-related transcription factors and genes associated with shorter overall survival in patients with ABC-DLBCL. Our data identify a novel function for LMP1 in aggressive DLBCL. Copyright © 2019 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
- Keywords
- CD40, DLBCL, EBV, LMP1, S1P, S1PR2,
- MeSH
- Phosphatidylinositol 3-Kinase metabolism MeSH
- CD40 Antigens genetics metabolism MeSH
- Databases, Genetic MeSH
- Lymphoma, Large B-Cell, Diffuse genetics metabolism mortality virology MeSH
- Epstein-Barr Virus Infections mortality virology MeSH
- Host-Pathogen Interactions MeSH
- Humans MeSH
- Cell Line, Tumor MeSH
- Prognosis MeSH
- Viral Matrix Proteins genetics metabolism MeSH
- Proto-Oncogene Proteins c-akt metabolism MeSH
- Sphingosine-1-Phosphate Receptors genetics metabolism MeSH
- Gene Expression Regulation, Neoplastic MeSH
- Signal Transduction MeSH
- Cell Transformation, Viral MeSH
- Herpesvirus 4, Human genetics metabolism MeSH
- Check Tag
- Humans MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Phosphatidylinositol 3-Kinase MeSH
- CD40 Antigens MeSH
- EBV-associated membrane antigen, Epstein-Barr virus MeSH Browser
- Viral Matrix Proteins MeSH
- Proto-Oncogene Proteins c-akt MeSH
- Sphingosine-1-Phosphate Receptors MeSH
- S1PR2 protein, human MeSH Browser
Trophoblastic cell surface antigen 2 (TROP2) is a membrane glycoprotein overexpressed in many solid tumors with a poor prognosis, including intestinal neoplasms. In our study, we show that TROP2 is expressed in preneoplastic lesions, and its expression is maintained in most colorectal cancers (CRC). High TROP2 positivity correlated with lymph node metastases and poor tumor differentiation and was a negative prognostic factor. To investigate the role of TROP2 in intestinal tumors, we analyzed two mouse models with conditional disruption of the adenomatous polyposis coli (Apc) tumor-suppressor gene, human adenocarcinoma samples, patient-derived organoids, and TROP2-deficient tumor cells. We found that Trop2 is produced early after Apc inactivation and its expression is associated with the transcription of genes involved in epithelial-mesenchymal transition, the regulation of migration, invasiveness, and extracellular matrix remodeling. A functionally similar group of genes was also enriched in TROP2-positive cells from human CRC samples. To decipher the driving mechanism of TROP2 expression, we analyzed its promoter. In human cells, this promoter was activated by β-catenin and additionally by the Yes1-associated transcriptional regulator (YAP). The regulation of TROP2 expression by active YAP was verified by YAP knockdown in CRC cells. Our results suggest a possible link between aberrantly activated Wnt/β-catenin signaling, YAP, and TROP2 expression.
- Keywords
- APC, EMT, TACSTD2, WNT/β-catenin signaling, colorectal cancer, expression profiling, organoids,
- Publication type
- Journal Article MeSH
