Effect of Quercetin on Diabetic Rat

Background: Quercetin (QR) is one of the major constituents of the methanolic extract of the leaves of Psidium guajava (Guava leaves). Objectives: The work’s aim is to understand the Quercetin’s mechanism in improving insulin resistance, use the homeostasis model assessment for insulin resistance (HOMA-IR) to determine the influence of quercetin on glycemic control, Look at how quercetin affects diabetes-related lipid metabolism and lipid profile measures. Analyze the impact of QR on oxidative stress in diabetic rats and contrast its antidiabetic effects whether administered as a nutrient or supplement. Materials and methods: Sixty adult male Wister rats that were matched in age and had starting body weights between 150 and 200 g were used in this study. One normoglycemic control group and 3 diabetic control groups (15 rats per group) were used. The diabetic control rats received the vehicle orally as saline daily, the normoglycemic control group received quercetin orally in a dose of 50 mg/kg per day, and the diabetic rats received quercetin orally in a dose of 100 mg/kg per day. Results: After six weeks of therapy, the rats with diabetes receiving isolated quercetin at doses of 50 and 100 mg/kg had reduced blood glucose levels, and their triglyceride, low-density lipoprotein, and total cholesterol profiles all significantly improved. Also, there was significant decrease homeostatic model assessment for insulin resistance, serum transaminases, hepatic malondialdehyde, and HMG CoA expression in liver and a substantial rise in levels of insulin, hepatic GSH, and insulin receptor substrate (IRS2) expression & Phosphoinositide 3-kinases in liver as compared to those of control group, but non- significance changes in high-density lipoprotein, AKT expression in liver were observed. Conclusions: Quercetin could be considered as a potential hypoglycmeic medication with possible mechanisms controlling the hyperglycemic state and cholesterol, triglycerides and LDL levels

Large expert-curated database for benchmarking document similarity detection in biomedical literature search

Document recommendation systems for locating relevant literature have mostly relied on methods developed a decade ago. This is largely due to the lack of a large offline gold-standard benchmark of relevant documents that cover a variety of research fields such that newly developed literature search techniques can be compared, improved and translated into practice. To overcome this bottleneck, we have established the RElevant LIterature SearcH consortium consisting of more than 1500 scientists from 84 countries, who have collectively annotated the relevance of over 180 000 PubMed-listed articles with regard to their respective seed (input) article/s. The majority of annotations were contributed by highly experienced, original authors of the seed articles. The collected data cover 76% of all unique PubMed Medical Subject Headings descriptors. No systematic biases were observed across different experience levels, research fields or time spent on annotations. More importantly, annotations of the same document pairs contributed by different scientists were highly concordant. We further show that the three representative baseline methods used to generate recommended articles for evaluation (Okapi Best Matching 25, Term Frequency-Inverse Document Frequency and PubMed Related Articles) had similar overall performances. Additionally, we found that these methods each tend to produce distinct collections of recommended articles, suggesting that a hybrid method may be required to completely capture all relevant articles. The established database server located at https://relishdb.ict.griffith.edu.au is freely available for the downloading of annotation data and the blind testing of new methods. We expect that this benchmark will be useful for stimulating the development of new powerful techniques for title and title/abstract-based search engines for relevant articles in biomedical research.Peer reviewe

Detection of pathogenic bacteria in diarrheal stool collected from children in North Lebanon by using conventional stool culture and microarray technique « CLART® Enterobac »

Bechara, R., Hosny, M., AL-Kassaa, I., Dabboussi, F., Mallat, H. and Hamze, M. 2016. Detection of pathogenic bacteria in diarrheal stool collected from children in north lebanon by using conventional stool culture and microarray technique « clart® enterobac ». Lebanese Science Journal, 17(2): 233-239. Illness caused by enteropathogens represents an important economic and health burden worldwide. The majority of enteropathogens causes gastrointestinal infections which have a great impact on public health both in developing and developed countries. The aim of this study is to detect and identify the main enteropathogens in Lebanese diarrheal stool from children under 15 years old. The detection was performed by using both conventional method and microarray technique CLART® EnteroBac (Genomica-Spain). Five enteric pathogens, Salmonella spp, Shigella spp, Clostridium difficile B, Enteropathogenic E. coli, Campylobacter jejuni were detected in 80 diarrheal stools, from children under 15 years old. The results showed that CLART® EnteroBac technique have detected enteropathogens in 19% of samples, whereas 1% returned positive using stool culture methods

Multidisciplinary evaluation of Clostridium butyricum clonality isolated from preterm neonates with necrotizing enterocolitis in South France between 2009 and 2017

Abstract The association between Clostridium species identification from stool samples in preterm neonates and the occurrence of necrotizing enterocolitis has been increasingly reported. To confirm the specific impact of Clostridium butyricum in this pathology, selective culture procedure was used for Clostridia isolation. Whole-genome analysis was employed to investigate genomic relationships between isolates. Stool samples from present study, as well as from previously investigated cases, were implicated including 88 from preterm neonates with necrotizing enterocolitis and 71 from matched controls. Quantitative real-time polymerase chain reaction was performed to evaluate the presence of C. butyricum from stools of new cases. Clostridium species prevalence isolated by culture was compared between patients with necrotizing enterocolitis and controls. By combining results of both culture and quantitative polymerase chain reaction methods, C. butyricum was significantly more frequent in stool samples from preterm neonates with necrotizing enterocolitis than in controls. Whole-genome analysis of 81 genomes including 58 neonates’ isolates revealed that cases were clustered depending on geographical origin of isolation. Controls isolates presented genomic relations with that of patients suggesting a mechanism of asymptomatic carriage. Overall, this suggests an epidemiology comparable to that observed in Clostridium difficile colitis in adults

Escherichia coli Isolated from Diabetic Foot Osteomyelitis: Clonal Diversity, Resistance Profile, Virulence Potential, and Genome Adaptation

International audienceThis study assessed the clonal diversity, the resistance profile and the virulence potential of Escherichia coli strains isolated from diabetic foot infection (DFI) and diabetic foot osteomyelitis (DFOM). A retrospective single-centre study was conducted on patients diagnosed with E. coli isolated from deep DFI and DFOM at Clinique du Pied Diabétique Gard-Occitanie (France) over a two-year period. Phylogenetic backgrounds, virulence factors (VFs) and antibiotic resistance profiles were determined. Whole-genome analysis of E. coli strains isolated from same patients at different periods were performed. From the two-years study period, 35 E. coli strains isolated from 33 patients were analysed; 73% were isolated from DFOM. The majority of the strains belonged to the virulent B2 and D phylogenetic groups (82%). These isolates exhibited a significant higher average of VFs number than strains belonging to other groups (p < 0.001). papG2 gene was significantly more detected in strains belonging to B2 phylogroup isolated from DFI compared to DFOM (p = 0.003). The most prevalent antibiotic resistance pattern was observed for ampicillin (82%), cotrimoxazole (45%), and ciprofloxacin (33%). The genome analysis of strains isolated at two periods in DFOM showed a decrease of the genome size, and this decrease was more important for the strain isolated at nine months (vs. four months). A shared mutation on the putative acyl-CoA dehydrogenase-encoding gene aidB was observed on both strains. E. coli isolates from DFOM were highly genetically diverse with different pathogenicity traits. Their adaptation in the bone structure could require genome reduction and some important modifications in the balance virulence/resistance of the bacteria

Long-Term Intrahost Evolution of Staphylococcus aureus Among Diabetic Patients With Foot Infections

International audienceStaphylococcus aureus is one of the main pathogens isolated from diabetic foot infections (DFI). The purpose of this study was to evaluate the importance of the persistence of S. aureus in this environment and the possible modifications of the bacterial genome content over time. Molecular typing of S. aureus isolates cultured from patients with the same DFI over a 7-year study revealed a 25% rate of persistence of this species in 48 patients, with a short median persistence time of 12weeks (range: 4–52weeks). Non-specific clonal complexes were linked to this persistence. During the follow-up, bla genes were acquired in three cases, whereas some virulence markers were lost in all cases after a long period of colonization (21.5weeks). Only one patient (2%) had a long-term persistence of 48weeks. The genome sequencing of a clonal pair of early/late strains isolated in this patient showed mutations in genes encoding bacterial defence and two-component signal transduction systems. Although, this study suggests that the long-term persistence of S. aureus in DFI is a rare event, genomic evolution is observed, highlighting the low adaptive ability of S. aureus to the specific environment and stressful conditions of diabetic foot ulcers. These results provide the basis for better understanding of S. aureus dynamics during persistent colonization in chronic wounds