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https://www.readbyqxmd.com/read/29353386/population-based-dose-response-analysis-of-liver-transcriptional-response-to-trichloroethylene-in-mouse
#1
Abhishek Venkatratnam, John S House, Kranti Konganti, Connor McKenney, David W Threadgill, Weihsueh A Chiu, David L Aylor, Fred A Wright, Ivan Rusyn
Studies of gene expression are common in toxicology and provide important clues to mechanistic understanding of adverse effects of chemicals. Most prior studies have been performed in a single strain or cell line; however, gene expression is heavily influenced by the genetic background, and these genotype-expression differences may be key drivers of inter-individual variation in response to chemical toxicity. In this study, we hypothesized that the genetically diverse Collaborative Cross mouse population can be used to gain insight and suggest mechanistic hypotheses for the dose- and genetic background-dependent effects of chemical exposure...
January 20, 2018: Mammalian Genome: Official Journal of the International Mammalian Genome Society
https://www.readbyqxmd.com/read/29353267/bioactive-pyrrole-alkaloids-isolated-from-the-red-sea-marine-sponge-stylissa-carteri
#2
Ashraf N E Hamed, Roland Schmitz, Anja Bergermann, Frank Totzke, Michael Kubbutat, Werner E G Müller, Diaa T A Youssef, Mokhtar M Bishr, Mohamed S Kamel, RuAngelie Edrada-Ebel, Wim Wätjen, Peter Proksch
Fifteen pyrrole alkaloids were isolated from the Red Sea marine sponge Stylissa carteri and investigated for their biological activities. Four of them were dibrominated [(+) dibromophakelline, Z-3-bromohymenialdisine, (±) ageliferin and 3,4-dibromo-1H-pyrrole-2-carbamide], nine compounds were monobrominated [(-) clathramide C, agelongine, (+) manzacidin A, (-) 3-bromomanzacidin D, Z-spongiacidin D, Z-hymenialdisine, 2-debromostevensine, 2-bromoaldisine and 4-bromo-1H-pyrrole-2-carbamide)] and finally, two compounds were non-brominated derivatives viz...
January 20, 2018: Zeitschrift Für Naturforschung. C, A Journal of Biosciences
https://www.readbyqxmd.com/read/29353239/altered-eicosanoid-production-and-phospholipid-remodeling-during-cell-culture
#3
Toshiaki Okuno, Miguel Angel Gijon, Simona Zarini, Sarah A Martin, Robert M Barkley, Christopher A Johnson, Mai Ohba, Takehiko Yokomizo, Robert C Murphy
The remodeling of polyunsaturated fatty acids (PUFAs) by the Lands cycle is responsible for the diversity of phospholipid molecular species found in cells. There have not been detailed studies of the alteration of phospholipid molecular species as a result of serum starvation or depletion of PUFAs that typically occurs during tissue culture. The time-dependent effect of cell culture on phospholipid molecular species in RAW 264.7 cells cultured for 24, 48 or 72 h was examined by lipidomic strategies. These cells were then stimulated to produce arachidonate metabolites derived from the cyclooxygenase pathway, TxB2, PGE2 and PGD2, and the 5-LO pathway, LTB4, LTC4 and 5-HETE which decreased with increasing time in culture...
January 20, 2018: Journal of Lipid Research
https://www.readbyqxmd.com/read/29353125/relationship-between-serum-trimethylamine-n-oxide-and-exposure-to-dioxin-like-pollutants
#4
Michael C Petriello, Richard Charnigo, Manjula Sunkara, Sony Soman, Marian Pavuk, Linda Birnbaum, Andrew J Morris, Bernhard Hennig
Trimethylamine N-oxide (TMAO) is a diet and gut microbiota-derived metabolite that has been linked to cardiovascular disease risk in human studies and animal models. TMAO levels show wide inter and intra individual variability in humans that can likely be accounted for by multiple factors including diet, the gut microbiota, levels of the TMAO generating liver enzyme Flavin-containing monooxygenase 3 (FMO3) and kidney function. We recently found that dioxin-like (DL) environmental pollutants increased FMO3 expression to elevate circulating diet-derived TMAO in mice, suggesting that exposure to this class of pollutants might also contribute to inter-individual variability in circulating TMAO levels in humans...
January 16, 2018: Environmental Research
https://www.readbyqxmd.com/read/29353078/blood-biochemical-parameters-and-melanomacrophage-centers-in-nile-tilapia-fed-essential-oils-of-clove-basil-and-ginger
#5
Aline Brum, Scheila Anelise Pereira, Lucas Cardoso, Edsandra Campos Chagas, Francisco Célio Maia Chaves, José Luiz Pedreira Mouriño, Maurício Laterça Martins
Nile tilapia (Oreochromis niloticus) is the most farmed freshwater fish in the world, however, disease outbreaks are the main cause of losses in production. Due to this, there is an increasing interest in natural products for enhancing disease resistance, without causing physiological impairment. The aim of this study was to verify the effect of the essential oils of clove basil (Ocimum gratissimum) and ginger (Zingiber officinale) on physiological and immunological parameters of nile tilapia. After 35 and 55 days of supplementation (0...
January 15, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29353070/7-hydroxylation-of-warfarin-is-strongly-inhibited-by-sesamin-but-not-by-episesamin-caffeic-and-ferulic-acids-in-human-hepatic-microsomes
#6
Nadezhda Pilipenko, Martin Krøyer Rasmussen, Olena Doran, Galia Zamaratskaia
Warfarin is a commonly used anticoagulant drug and is a derivate of coumarin. Cytochrome P450 2C9 (CYP2C9) plays the key role in transformation of coumarin and thus, influences determination of warfarin dosage. A number of factors including dietary compounds such as sesamin, caffeic acid and ferulic acids can regulate the activity of CYP2C9. The present study tested the hypothesis that sesamin, episesamin, caffeic acid and ferulic acid decreases the rate of warfarin 7-hydroxylation via inhibition of hepatic CYP2C9...
January 15, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29353036/nmr-based-serum-metabolomics-study-reveals-a-innovative-diagnostic-model-for-missed-abortion
#7
Zhenghong Wu, Lei Jin, Wenyi Zheng, Chenxi Zhang, Liwen Zhang, Yaping Chen, Junhua Guan, He Fei
A missed abortion (MA) is an in-utero death of the embryo or fetus before the 20th week of gestation with retained products of conception. In order to discover novel biomarkers for MA, a 1H NMR spectroscopy-based metabolomics approach was applied to detect human MA serum metabolic profiles. Serum samples were obtained from patients with MA (n = 15) and healthy controls (n = 9) for study. The NOESYPR1D spectrum combined with multi-variate pattern recognition analysis was used to cluster the groups and establish a disease-specific metabolites phenotype...
January 15, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29353003/urine-and-plasma-metabolomics-study-on-potential-hepatoxic-biomarkers-identification-in-rats-induced-by-gynura-segetum
#8
Qiu Shoubei, Zhang Haixia, Fei Qianqian, Zhu Fenxia, Wang Jing, Jia Xiaobin, Chen Bin
ETHNOPHARMACOLOGICAL RELEVANCE: Gynura segetum (GS) is an herbal medicine containing Pyrrolizidine Alkaloids (PAs) that causes hepatic sinusoidal obstruction syndrome (HSOS). AIM OF THE STUDY: To discover potential biomarkers and metabolic mechanisms involved in the hepatotoxicity induced by GS. METHODS: SD rats were randomly divided into 4 groups including Saline, the decoction of GS high, medium and low dosage at dosages of 3.75g • kg-1, 7...
January 15, 2018: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29352982/inhibition-of-cyp3a-by-antimalarial-piperaquine-and-its-metabolites-in-human-liver-microsomes-with-iviv-extrapolation
#9
Mohd Yusmaidie Aziz, Kurt-Jürgen Hoffmann, Michael Ashton
The potential of the antimalarial piperaquine and its metabolites to inhibit CYP3A was investigated in pooled human liver microsomes. CYP3A activity was measured by LC-MS/MS as the rate of 1'-hydroxymidazolam formation. Piperaquine was found to be a reversible, potent inhibitor of CYP3A with the following parameter estimates (%CV): IC50 = 0.76 μM (29), Ki = 0.68 μM (29). In addition, piperaquine acted as a time-dependent inhibitor (TDI) with IC50 declining to 0.32 μM (28) during 30 min pre-incubation. TDI estimates were kinact = 0...
January 15, 2018: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29352967/product-specificity-of-fungal-8r-and-9s-dioxygenases-of-the-peroxidase-cyclooxygenase-superfamily-with-amino-acid-derivatized-polyenoic-fatty-acids
#10
Ernst H Oliw
Pathogenic fungi express fatty acid dioxygenases (DOX) fused to cytochromes P450 with diol or allene oxide synthase activities. The orientation of the fatty acids in the active sites of DOX was investigated with amino acid conjugates of 18:3n-3 and 18:2n-6. 9S-DOX-allene oxide synthase (AOS) oxidized the Gly, Ile, and Trp derivatives at C-9, which suggests that these conjugates enter the substrate recognition site with the omega end in analogy with fatty acids bound to cyclooxygenases and coral 8R-lipoxygenase (8R-LOX)...
January 15, 2018: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29352966/polyphyllin-g-exhibits-antimicrobial-activity-and-exerts-anticancer-effects-on-human-oral-cancer-oecm-1-cells-by-triggering-g2-m-cell-cycle-arrest-by-inactivating-cdc25c-cdc2
#11
Xiaoqing Cai, Lele Guo, Fei Pei, Xiaoyun Chang, Rui Zhang
Plant natural products have long been considered to be important sources of bioactive molecules. A large number of antimicrobial and anticancer agents have been isolated form plants. In the present study we evaluated the antimicrobial and anticancer activity of a plant derived secondery metabolite, Polyphyllin G. The results of antibacterial assays showed that Polyphyllin G prevented the growth of both Gram-positive and Gram-negative bacteria with minimum inhibitory concentrations (MICs) ranging from 13.1 to 78 μg/ml...
January 15, 2018: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29352494/the-effects-of-late-gestation-nutrient-restriction-of-dams-on-beef-heifer-intake-metabolites-and-hormones-during-an-ad-libitum-feeding-trial
#12
J E Tipton, R E Ricks, C T LeMaster, N M Long
This study's objective was to determine if nutrient restriction during late gestation affected beef heifer feed intake, body weight (BW) gain and endocrine regulation during a 10-week feeding trial. During the last 100 days of gestation, control (CON) dams were fed to increase body condition score (BCS). Whereas, nutrient-restricted dams (NR) and NR dams protein supplemented 3 days/week (NRS) were fed to decrease BCS by 1.2. After parturition, all cow-calf pairs were moved to a common pasture and fed in excess of requirements until weaning...
January 19, 2018: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/29352476/pharmacokinetic-profiles-of-the-active-metamizole-metabolites-after-four-different-routes-of-administration-in-healthy-dogs
#13
M Giorgi, B Łebkowska-Wieruszewska, A Lisowski, H Owen, A Poapolathep, T W Kim, V De Vito
Metamizole (MT), an analgesic and antipyretic drug, is rapidly hydrolyzed to the active primary metabolite 4-methylaminoantipyrine (MAA) and relatively active secondary metabolite 4-aminoantipyrine (AA). The aim of this study was to assess the pharmacokinetic profiles of MAA and AA after dose of 25 mg/kg MT by intravenous (i.v.), intramuscular (i.m.), oral (p.o.), and rectal (RC) routes in dogs. Six dogs were randomly allocated to an open, single-dose, four-treatment, four-phase, unpaired, crossover study design...
January 19, 2018: Journal of Veterinary Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/29352388/cutaneous-granulomatosis-a-comprehensive-review
#14
REVIEW
Benedetta Terziroli Beretta-Piccoli, Carlo Mainetti, Marie-Astrid Peeters, Emmanuel Laffitte
Cutaneous granulomatosis is a heterogeneous group of diseases, characterized by a skin inflammatory reaction triggered by a wide variety of stimuli, including infections, foreign bodies, malignancy, metabolites, and chemicals. From a pathogenic point of view, they are divided into non-infectious and infectious granulomas. Pathophysiological mechanisms are still poorly understood. Non-infectious granulomatous skin diseases include granuloma annulare, necrobiosis lipoidica, rheumatic nodules, foreign body granulomas, cutaneous sarcoidosis, and interstitial granulomatous dermatitis...
January 19, 2018: Clinical Reviews in Allergy & Immunology
https://www.readbyqxmd.com/read/29352386/glucose-homeostasis-in-major-depression-and-schizophrenia-a-comparison-among-drug-na%C3%A3-ve-first-episode-patients
#15
Johann Steiner, Brisa S Fernandes, Paul C Guest, Henrik Dobrowolny, Gabriela Meyer-Lotz, Sabine Westphal, Katrin Borucki, Kolja Schiltz, Zoltán Sarnyai, Hans-Gert Bernstein
There is evidence for insulin resistance in drug-naïve first-episode schizophrenia (Sz) patients. We have tested whether impaired insulin homeostasis is also present in first-episode patients with major depression (MD) and if this can be discerned from stress-related and medication effects. Homeostatic model assessment of insulin resistance (HOMA-IR) was determined in a cross-sectional cohort study of acute first-episode drug-naïve patients with MD (n = 18) or Sz (n = 24), and healthy controls (C, n = 43)...
January 19, 2018: European Archives of Psychiatry and Clinical Neuroscience
https://www.readbyqxmd.com/read/29352219/new-alkylresorcinol-metabolites-in-spot-urine-as-biomarkers-of-whole-grain-wheat-and-rye-intake-in-a-swedish-middle-aged-population
#16
Rikard Landberg, Roksana Wierzbicka, Lin Shi, Sanna Nybacka, Afaf Kamal-Eldin, Bo Hedblad, Anna Karin Lindroos, Anna Winkvist, Heléne Bertéus Forslund
BACKGROUND/OBJECTIVES: Studies on the health effects of whole grains typically use self-reported intakes which are prone to large measurement errors. Dietary biomarkers that can provide an objective measure of intake are needed. New alkylresorcinol (AR) metabolites (3,5-dihydroxycinnamic acid (DHCA), 2-(3,5-dihydroxybenzamido)acetic acid (DHBA-glycine) and 5-(3,5-dihydroxyphenyl) pentanoic acid (DHPPTA)) in 24 h urine samples have been suggested as biomarkers for whole grain (WG) wheat and rye intake but remain to be evaluated in spot urine samples...
January 19, 2018: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/29352207/ethanol-sensitizes-hepatocytes-for-tgf-%C3%AE-triggered-apoptosis
#17
Haristi Gaitantzi, Christoph Meyer, Pia Rakoczy, Maria Thomas, Kristin Wahl, Franziska Wandrer, Heike Bantel, Hamed Alborzinia, Stefan Wölfl, Sabrina Ehnert, Andreas Nüssler, Ina Bergheim, Loredana Ciuclan, Matthias Ebert, Katja Breitkopf-Heinlein, Steven Dooley
Alcohol abuse is a global health problem causing a substantial fraction of chronic liver diseases. Abundant TGF-β-a potent pro-fibrogenic cytokine-leads to disease progression. Our aim was to elucidate the crosstalk of TGF-β and alcohol on hepatocytes. Primary murine hepatocytes were challenged with ethanol and TGF-β and cell fate was determined. Fluidigm RNA analyses revealed transcriptional effects that regulate survival and apoptosis. Mechanistic insights were derived from enzyme/pathway inhibition experiments and modulation of oxidative stress levels...
January 19, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29352205/2-5-hexanedione-induces-dopaminergic-neurodegeneration-through-integrin-%C3%AE-m%C3%AE-2-nadph-oxidase-axis-mediated-microglial-activation
#18
Cong Zhang, Liyan Hou, Jie Yang, Yuning Che, Fuqiang Sun, Huihua Li, Qingshan Wang
Recent study demonstrated that chronic exposure to solvents increases the risk of Parkinson's disease (PD), the second most common neurodegenerative disorder characterized by progressive dopaminergic neurodegeneration in the substantia nigra (SN). n-Hexane, a widely used organic solvent, displays central-peripheral neurotoxicity, which is mainly mediated by its active metabolite, 2,5-hexanedione (HD). However, whether HD exposure contributes to PD remains unclear. In this study, we found that rats exposed to HD displayed progressive dopaminergic neurodegeneration in the nigrostriatal system...
January 19, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29352134/pseudoalteromonas-haloplanktis-tac125-produces-4-hydroxybenzoic-acid-that-induces-pyroptosis-in-human-a459-lung-adenocarcinoma-cells
#19
Filomena Sannino, Clementina Sansone, Christian Galasso, Sara Kildgaard, Pietro Tedesco, Renato Fani, Gennaro Marino, Donatella de Pascale, Adrianna Ianora, Ermenegilda Parrilli, Thomas Ostenfeld Larsen, Giovanna Romano, Maria Luisa Tutino
In order to exploit the rich reservoir of marine cold-adapted bacteria as a source of bioactive metabolites, ethyl acetate crude extracts of thirteen polar marine bacteria were tested for their antiproliferative activity on A549 lung epithelial cancer cells. The crude extract from Pseudoalteromonas haloplanktis TAC125 was the most active in inhibiting cell proliferation. Extensive bioassay-guided purification and mass spectrometric characterization allowed the identification of 4-hydroxybenzoic acid (4-HBA) as the molecule responsible for this bioactivity...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352089/cryptic-production-of-trans-3-hydroxyproline-in-echinocandin-b-biosynthesis
#20
Johanna Mattay, Stefanie Houwaart, Wolfgang Hüttel
Echinocandins are antifungal nonribosomal hexapeptides produced by fungi. Two of the amino acids are hydroxy-l-prolines: trans-4-hydroxy-l-proline and, in most echinocandin structures, (trans-2,3)-3-hydroxy-(trans-2,4)-4-methyl-l-proline. In the case of echinocandin biosynthesis by Glarea lozoyensis, both amino acids are found in pneumocandin A0, while in pneumocandin B0 the latter residue is substituted by trans-3- hydroxy-l-proline (3-Hyp). We have recently reported that all three amino acids are generated by the 2-oxoglutarate-dependent proline hydroxylase GloF...
January 19, 2018: Applied and Environmental Microbiology
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