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https://www.readbyqxmd.com/read/29140706/a-galactosylated-pro-drug-of-ursodeoxycholic-acid-design-synthesis-characterization-and-pharmacological-effects-in-a-rat-model-of-estrogen-induced-cholestasis
#1
Francesca Di Guida, Claudio Pirozzi, Salvatore Magliocca, Anna Santoro, Adriano Lama, Roberto Russo, Maria Nieddu, Lucia Burrai, Gianpiero Boatto, Maria Pina Mollica, Federica Sodano, Loretta Lazzarato, Konstantin Chegaev, Rosaria Meli, Giuseppina Mattace Raso, Maria Grazia Rimoli
Ursodeoxycholic acid (UDCA) is considered the first-choice therapy for cholestatic disorders. To enhance solubility and exploit specific transporters in liver, we synthesized a new galactosyl pro-drug of UDCA (UDCAgal). Ethinylestradiol (EE)-induced cholestasis was used to study and compare the effects of UDCAgal with UDCA on bile flow, hepatic canalicular efflux transporter expression, and inflammation. UDCAgal resulted quite stable both at pH 7.4 and 1.2 and regenerated the parent drug after incubation in human plasma...
November 15, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29134812/deoxycholate-enhanced-shigella-virulence-is-regulated-by-a-rare-%C3%AF-helix-in-the-type-three-secretion-system-tip-protein-ipad
#2
Abram R Bernard, T Carson Jessop, Prashant Kumar, Nicholas E Dickenson
Type three secretion systems (T3SS) are specialized nano-machines that support infection by injecting bacterial proteins directly into host cells. The Shigella T3SS has uniquely evolved to sense environmental levels of the bile salt deoxycholate (DOC) and up-regulate virulence in response to DOC. In this study, we describe a rare i+5 hydrogen bonding secondary structure element (π-helix) within the type three secretion system tip protein IpaD that plays a critical role in DOC-enhanced virulence. Specifically, engineered mutations within the π-helix altered the pathogen's response to DOC with one mutant construct in particular exhibiting an unprecedented reduction in virulence following DOC exposure...
November 14, 2017: Biochemistry
https://www.readbyqxmd.com/read/29134547/detection-of-virulence-related-genes-in-lactococcus-garvieae-and-their-expression-in-response-to-different-conditions
#3
Giovanni Eraclio, Giovanni Ricci, Mattia Quattrini, Paolo Moroni, Maria Grazia Fortina
Lactococcus garvieae has emerged as an important zoonotic pathogen. However, information regarding mechanisms and factors related to its pathogenicity is lacking. In the present study, we investigated the distribution and functionality of genes related to virulence factors in L. garvieae strains isolated from different niches (diseased fish, humans, meat and dairy products, vegetables), using both post-genomic and genotypic analysis. Putative genes encoding hemolysin, fibronectin-binding protein, and penicillin acylase were detected in all analyzed genomes/strains...
November 13, 2017: Folia Microbiologica
https://www.readbyqxmd.com/read/29133896/the-food-borne-pathogen-campylobacter-jejuni-responds-to-the-bile-salt-deoxycholate-with-countermeasures-to-reactive-oxygen-species
#4
Nicholas M Negretti, Christopher R Gourley, Geremy Clair, Joshua N Adkins, Michael E Konkel
Bile plays an important role in digestion, absorption of fats, and the excretion of waste products, while concurrently providing a critical barrier against colonization by harmful bacteria. Previous studies have demonstrated that gut pathogens react to bile by adapting their protein synthesis. The ability of pathogens to respond to bile is remarkably complex and still incompletely understood. Here we show that Campylobacter jejuni, a leading bacterial cause of human diarrheal illness worldwide, responds to deoxycholate, a component of bile, by altering global gene transcription in a manner consistent with a strategy to mitigate exposure to reactive oxygen stress...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29130306/evaluating-in-vitro-culture-medium-of-gut-microbiome-with-orthogonal-experimental-design-and-metaproteomics-approach
#5
Leyuan Li, Xu Zhang, Zhibin Ning, Janice Mayne, Jasmine I Moore, James Butcher, Cheng-Kang Chiang, David R Mack, Alain Stintzi, Daniel Figeys
In vitro culture-based approaches are time- and cost-effective solutions for rapidly evaluating the effects of drugs or natural compounds against microbiomes. The nutritional composition of the culture medium is an important determinant for effectively maintaining the gut microbiome in vitro. This study combines orthogonal experimental design and a metaproteomics approach to obtain functional insights into the effects of different medium components on the microbiome. Our results show that the metaproteomic profile respond differently to medium components, including inorganic salts, bile salts, mucin and short chain fatty acids...
November 13, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/29115890/exploiting-bilosomes-for-delivering-bioactive-polysaccharide-isolated-from-enteromorpha-intestinalis-for-hacking-hepatocellular-carcinoma
#6
Azza Abdelmageed Matloub, Alaa Hamed Salama, Hadeer Ahmed Aglan, Mona Mahmoud AbouSamra, Sahar Salah Mohamed ElSouda, Hanaa Hamdy Ahmed
Bile salts containing vesicles (bilosomes) represent a portentous vesicular carrier that showed prosperous results in delivering active moieties in the gastrointestinal tract (GIT). In this study, bilosomes were exploited to deliver sulphated polysaccharide-protein complexes of Enteromorpha intestinalis (EHEM) and enhance its activity against hepatocellular carcinoma as well as resist harsh GIT conditions. Bilosomes were prepared using the sodium salt of three different bile acids (cholic, deoxycholic, taurodeoxycholic) and two different non-ionic surfactants (Span 40 and 65)...
November 8, 2017: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/29096343/non-anastomotic-strictures-after-transplanting-a-liver-graft-with-an-accidentally-ligated-and-unflushed-common-bile-duct-a-case-report
#7
Nicolas Meurisse, Jacques Pirenne, Diethard Monbaliu
INTRODUCTION: Non-anastomotic biliary strictures (NAS) represent a major cause of morbidity, graft loss, and mortality after liver transplantation (LTx). NAS can result from an ischemic/immune-mediated injury, or from the cytotoxic effect that bile salts have on the biliary mucosa under hypothermic conditions. For this reason it is crucial to flush the bile duct at the time of procurement. PRESENTATION OF CASE: We report a case of an imported liver with an accidentally ligated and subsequently completely unflushed common bile duct...
October 26, 2017: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/29091294/zebrafish-abcb11b-mutant-reveals-novel-strategies-to-restore-bile-excretion-impaired-by-bile-salt-export-pump-deficiency
#8
Jillian L Ellis, Kevin E Bove, Erin G Schuetz, Daniel Leino, C Alexander Valencia, John D Schuetz, Alexander Miethke, Chunyue Yin
Bile salt export pump BSEP (ABCB11) is a liver-specific adenosine triphosphate-cassette binding transporter that mediates canalicular bile salt excretion from hepatocytes. Human mutations in ABCB11 cause progressive familial intrahepatic cholestasis type II (PFIC2). Although over 150 ABCB11 variants have been reported, our understanding of their biological consequences is limited by the lack of experimental model that recapitulates the patient phenotypes. We applied CRISPR/Cas9-based genome editing technology to knockout abcb11b, the ortholog of human ABCB11, in zebrafish and found that these mutants died prematurely...
November 1, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/29090933/characterization-of-solubilizing-nanoaggregates-present-in-different-versions-of-simulated-intestinal-fluid
#9
Andrew J Clulow, Albin Parrow, Adrian M Hawley, Jamal Khan, Anna Pham, Per Larsson, Christel A S Bergström, Ben J Boyd
The absorption of hydrophobic drugs and nutrients from the intestine is principally determined by the amount that can be dissolved by the endogenous fluids present in the gut. Human intestinal fluids (HIFs) comprise a complex mixture of bile salts, phospholipids, steroids and glycerides that vary in composition in the fed and fasted state and between subjects. A number of simulated intestinal fluid (SIF) compositions have been developed to mimic fasted and fed state intestinal conditions and allow the in vitro determination of drug solubility as a proxy for the maximum intestinal concentration possible to reach...
November 1, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29090346/activation-of-insulin-like-growth-factor-1-receptor-participates-downstream-of-gpr30-in-estradiol-17%C3%AE-d-glucuronide-induced-cholestasis-in-rats
#10
Ismael R Barosso, Gisel S Miszczuk, Nadia Ciriaci, Romina B Andermatten, Paula M Maidagan, Valeria Razori, Diego R Taborda, Marcelo G Roma, Fernando A Crocenzi, Enrique J Sánchez Pozzi
Estradiol-17β-D-glucuronide (E17G), through the activation of different signaling proteins, induces acute endocytic internalization of canalicular transporters in rat, including multidrug resistance-associated protein 2 (Abcc2) and bile salt export pump (Abcb11), generating cholestasis. Insulin-like growth factor 1 receptor (IGF-1R) is a membrane-bound tyrosine kinase receptor that can potentially interact with proteins activated by E17G. The aim of this study was to analyze the potential role of IGF-1R in the effects of E17G in isolated perfused rat liver (IPRL) and isolated rat hepatocyte couplets...
October 31, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/29090088/gut-microbiota-as-a-potential-target-of-metabolic-syndrome-the-role-of-probiotics-and-prebiotics
#11
REVIEW
Mingqian He, Bingyin Shi
Metabolic syndrome (MS) comprises central obesity, increased plasma glucose levels, hyperlipidemia and hypertension, and its incidence is increasing due to changes in lifestyle and dietary structure in recent years. MS has been proven to be associated with an increased incidence of cardiovascular diseases and type 2 diabetes mellitus, leading to morbidity and mortality. In this manuscript, we review recent studies concerning the role of the gut microbiota in MS modulation. Manipulation of the gut microbiota through the administration of prebiotics or probiotics may assist in weight loss and reduce plasma glucose and serum lipid levels, decreasing the incidence of cardiovascular diseases and type 2 diabetes mellitus...
2017: Cell & Bioscience
https://www.readbyqxmd.com/read/29080817/production-and-structural-characterization-of-exopolysaccharides-from-newly-isolated-probiotic-lactic-acid-bacteria
#12
Yousra Abid, Angela Casillo, Houda Gharsallah, Ichrak Joulak, Rosa Lanzetta, Maria Michela Corsaro, Hamadi Attia, Samia Azabou
In this work, four exopolysaccharide-producing lactic acid bacteria (LAB) strains, newly isolated from Tunisian spontaneously fermented foods and beverages, namely bovine and turkey meat sausages (BMS and TMS), date palm sap (DPS) and cow milk (CM), were identified as Leuconostoc citreum-BMS, Leuconostoc mesenteroides-TMS, Pediococcus pentosaceus-DPS and Leuconostoc pseudomesenteroides-CM, respectively. The isolated strains showed the ability to withstand simulated human gastrointestinal (GI) tract conditions (low pH, lysozyme, bile salts, pepsin and pancreatin) and showed high surface hydrophobicity (79-90%), besides their ability to act against Escherichia coli and Listeria monocytogenes and to produce exopolysaccharides (EPS)...
October 25, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29077972/characterization-and-evaluation-of-lactic-acid-bacteria-candidates-for-intestinal-epithelial-permeability-and-salmonella-typhimurium-colonization-in-neonatal-turkey-poults
#13
Y Yang, J D Latorre, B Khatri, Y M Kown, B W Kong, K D Teague, L E Graham, A D Wolfenden, B D Mahaffey, M Baxter, X Hernandez-Velasco, R Merino-Guzman, B M Hargis, G Tellez
The present study evaluated the microbiological properties of three probiotic candidate strains of lactic acid bacteria (LAB) (128; 131; CE11_2), their effect on intestinal epithelial permeability, and their ability to reduce intestinal colonization of Salmonella Typhimurium (ST) individually or as a batch culture in neonatal turkey poults. Isolates were characterized morphologically and identified using 16S rRNA sequence analyses. Each isolate was evaluated for tolerance and resistance to acidic pH, high osmotic NaCl concentrations, and bile salts in broth medium...
October 25, 2017: Poultry Science
https://www.readbyqxmd.com/read/29076707/evaluation-of-probiotic-attributes-of-lactobacillus-sp-isolated-from-cow-and-buffalo-curd-samples-collected-from-kandy
#14
M F Shuhadha, G J Panagoda, T Madhujith, N W Jayawardana
Introduction: Curd is a potential source of probiotic Lactobacillus species. Methods: This study was carried out to isolate and characterise Lactobacillus species available in curd samples sold in the market. Nine curd samples prepared using cow or buffalo milk were obtained from a local market in the Kandy district. Results: Seven isolates (LB 1-7) were identified based on their colony morphology and biochemical characteristics and evaluated for probiotic attributes such as low pH tolerance, resistance to bile salts, antimicrobial activity against Escherichia coli and Pseudomonas aeruginosa, antibiotic activity against erythromycin, chloramphenicol and norfloxacin, haemolytic activity and DNase activity...
September 30, 2017: Ceylon Medical Journal
https://www.readbyqxmd.com/read/29076071/bile-salt-hydrolase-mediated-inhibitory-effect-of-bacteroides-ovatus-on-growth-of-clostridium-difficile
#15
Soobin Yoon, Junsun Yu, Andrea McDowell, Sung Ho Kim, Hyun Ju You, GwangPyo Ko
Clostridium difficile infection (CDI) is one of the most common nosocomial infections. Dysbiosis of the gut microbiota due to consumption of antibiotics is a major contributor to CDI. Recently, fecal microbiota transplantation (FMT) has been applied to treat CDI. However, FMT has important limitations including uncontrolled exposure to pathogens and standardization issues. Therefore, it is necessary to evaluate alternative treatment methods, such as bacteriotherapy, as well as the mechanism through which beneficial bacteria inhibit the growth of C...
November 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/29074589/abca1-derived-nascent-high-density-lipoprotein-apolipoprotein-ai-and-lipids-metabolically-segregate
#16
Bingqing Xu, Baiba K Gillard, Antonio M Gotto, Corina Rosales, Henry J Pownall
OBJECTIVE: Reverse cholesterol transport comprises cholesterol efflux from ABCA1-expressing macrophages to apolipoprotein (apo) AI, giving nascent high-density lipoprotein (nHDL), esterification of nHDL-free cholesterol (FC), selective hepatic extraction of HDL lipids, and hepatic conversion of HDL cholesterol to bile salts, which are excreted. We tested this model by identifying the fates of nHDL-[(3)H]FC, [(14)C] phospholipid (PL), and [(125)I]apo AI in serum in vitro and in vivo. APPROACH AND RESULTS: During in vitro incubation of human serum, nHDL-[(3)H]FC and [(14)C]PL rapidly transfer to HDL and low-density lipoproteins (t1/2=2-7 minutes), whereas nHDL-[(125)I]apo AI transfers solely to HDL (t1/2<10 minutes) and to the lipid-free form (t1/2>480 minutes)...
October 26, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/29072917/dual-level-statistical-investigation-of-equilibrium-solubility-in-simulated-fasted-and-fed-intestinal-fluid
#17
Bayan E Ainousah, Jeremy Perrier, Claire Dunn, Ibrahim Khadra, Clive G Wilson, Gavin W Halbert
The oral route is the preferred option for drug administration but contains the inherent issue of drug absorption from the gastro-intestinal tract (GIT) in order to elicit systemic activity. A pre-requisite for absorption is drug dissolution, which is dependent upon drug solubility in the variable milieu of GIT fluid, with poorly soluble drugs presenting a formulation and biopharmaceutical challenge. Multiple factors within GIT fluid influence solubility ranging from pH to the concentration and ratio of amphiphilic substances such as phospholipid, bile salt, monoglyceride and cholesterol and to aid in vitro investigation simulated intestinal fluids (SIF) covering the fasted and fed state have been developed...
October 26, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29065710/effect-of-a-yoghurt-drink-containing-lactobacillus-strains-on-bacterial-vaginosis-in-women-a-double-blind-randomised-controlled-clinical-pilot-trial
#18
C Laue, E Papazova, A Liesegang, A Pannenbeckers, P Arendarski, B Linnerth, K J Domig, W Kneifel, L Petricevic, J Schrezenmeir
Bacterial vaginosis (BV) is characterised by a depletion of lactobacilli in favour of an overgrowth of anaerobic bacteria. It is associated with increased risk for urogenital infections and abortion. In this study we assessed the effect of a yoghurt drink containing Lactobacillus strains on BV. The strains had been isolated from healthy pregnant women and selected for acidification capacity, production of H2O2, glycogen utilisation, bile salt tolerance and inhibition of pathogens. Using Amsel criteria BV was diagnosed in 36 women aged ≥18 years with stable menstrual cycle or menopause...
October 25, 2017: Beneficial Microbes
https://www.readbyqxmd.com/read/29064056/isolation-identification-of-lactobacillus-mucosae-an1-and-its-antilisterial-peptide-purification-and-characterization
#19
Ayyanna Repally, Venkatesh Perumal, Ankaiah Dasari, Esakkiraj Palanichamy, Arul Venkatesan
Lactobacillus mucosae strain AN1 isolated from sheep milk and characterized for its probiotic suitability. In vitro evaluation of critical gut endurance properties of this strain were assessed by different screening methods such as bile salt, gastric acid, lysozyme tolerance assays, hemolytic, cholesterol reduction properties, and HT-29 cell line adhesion assay. Antibacterial peptide from this strain was purified using ammonium sulphate precipitation, gel filtration chromatography and reverse-phase HPLC. The molecular mass of peptides was determined by Tricine-SDS-PAGE and confirmed by matrix-assisted laser desorption ionization-time of flight mass spectroscopy (MALDI-TOF-MS)...
October 24, 2017: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/29056690/detection-and-characterization-of-histamine-producing-strains-of-photobacterium-damselae-subsp-damselae-isolated-from-mullets
#20
Marcello Trevisani, Rocco Mancusi, Matilde Cecchini, Claudia Costanza, Marino Prearo
Photobacterium damselae subsp. damselae (Pdd) is considered to be an emerging pathogen of marine fish and has also been implicated in cases of histamine food poisoning. In this study, eight strains isolated from mullets of the genera Mugil and Liza captured in the Ligurian Sea were characterized, and a method to detect histamine-producing Pdd from fish samples was developed. The histamine-producing potential of the strains was evaluated in culture media (TSB+) using a histamine biosensor. Subsequently, two strains were used to contaminate mackerel fillets (4 or 40 CFU/g), simulating a cross-contamination on the selling fish stalls...
June 20, 2017: Veterinary Sciences
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