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https://www.readbyqxmd.com/read/28433925/low-dose-pollutant-mixture-triggers-metabolic-disturbances-in-female-mice-leading-to-common-and-specific-features-as-compared-to-a-high-fat-diet
#1
Emmanuel Labaronne, Claudie Pinteur, Nathalie Vega, Sandra Pesenti, Benoit Julien, Emmanuelle Meugnier-Fouilloux, Hubert Vidal, Danielle Naville, Brigitte Le Magueresse-Battistoni
Environmental pollutants are potential etiologic factors of obesity and diabetes that reach epidemic proportions worldwide. However, it is important to determine if pollutants could exert metabolic defects without directly inducing obesity. The metabolic disturbances triggered in nonobese mice lifelong exposed to a mixture of low-dose pollutants (2,3,7,8-tetrachlorodibenzo-p-dioxine, polychlorinated biphenyl 153, diethylhexyl-phthalate, and bisphenol A) were compared with changes provoked by a high-fat high-sucrose (HFHS) diet not containing the pollutant mixture...
April 8, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28433806/polymorphism-of-cyp1a1-gene-variants-rs4646903-and-rs1048943-relation-to-the-incidence-of-cervical-cancer-in-chhattisgarh
#2
Vijaylakshmi Jain, Yashwant K Ratre, Dnyanesh Amle, Pankaj K Mishra, Pradeep K Patra
Cytochrome P450 CYP1A1 is a phase 1 xenobiotic metabolizing enzyme involved in the metabolism of toxins, endogenous hormones and pharmaceutical drugs. It is therefore possible that polymorphism of CYP1A1 gene producing functional changes in the enzyme may be susceptible factors in cervical carcinogenesis. This study was aimed to look association of CYP1A1m1 (T>C) and m2 (A>G) gene polymorphisms in Chhattisgarh population. In this case-control study, we analyzed leukocyte DNA from a total of 200 subjects form Chhattisgarh (100 cases and 100 controls)...
April 13, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28431786/-ligninolytic-enzyme-production-by-white-rot-fungi-during-paraquat-herbicide-degradation
#3
Reyna L Camacho-Morales, José Luis Gerardo-Gerardo, Karina Guillén Navarro, José E Sánchez
Paraquat is a widely used herbicide in agriculture. Its inappropriate use and wide distribution represents a serious pollution problem for soil and water. White rot fungi are capable of degrading pollutants having a similar structure to that of lignin, such as paraquat. This study evaluated the degradation effect of paraquat on the production of ligninolytic enzymes by white rot fungi isolated from the South of Mexico. Six fungal strains showed tolerance to the herbicide in solid culture. Three of the six evaluated strains showed levels of degradation of 32, 26 and 47% (Polyporus tricholoma, Cilindrobasidium laeve and Deconica citrispora, respectively) after twelve days of cultivation in the presence of the xenobiotic...
April 18, 2017: Revista Argentina de Microbiología
https://www.readbyqxmd.com/read/28428832/a-meta-analysis-testing-eusocial-co-option-theories-in-termite-gut-physiology-and-symbiosis
#4
Michael E Scharf, Yunpeng Cai, Yijun Sun, Ruchira Sen, Rhitoban Raychoudhury, Drion G Boucias
The termite gut accomplishes key physiologic functions that underlie termite symbiosis and sociality. However, potential candidate functions of the host-symbiont holobiome have not yet been explored across seemingly divergent processes such as digestion, immunity, caste differentiation, and xenobiotic tolerance. This study took a meta-analysis approach for concurrently studying host and symbiont gut metatranscriptome responses of the lower termite Reticulitermes flavipes, which has ancestral characteristics and hosts a diverse mix of eukaryotic and bacterial symbionts...
2017: Communicative & Integrative Biology
https://www.readbyqxmd.com/read/28428286/a-genetic-analysis-of-the-caenorhabditis-elegans-detoxification-response
#5
Tetsunari Fukushige, Harold E Smith, Johji Miwa, Michael W Krause, John A Hanover
Oxidative damage contributes to human diseases of aging including diabetes, cancer, and cardiovascular disorders. Reactive oxygen species resulting from xenobiotic and endogenous metabolites are sensed by a poorly understood process, triggering a cascade of regulatory factors and leading to the activation of the transcription factor Nrf2 (SKN-1 in Caenorhabditis elegans). Nrf2/SKN-1 activation promotes the induction of the Phase II detoxification system that serves to limit oxidative stress. We have extended a previous C...
April 19, 2017: Genetics
https://www.readbyqxmd.com/read/28428009/effect-of-methylparaben-in-artemia-franciscana
#6
Amparo Comeche, María Martín-Villamil, Yolanda Pico, Inma Varó
In this study, the toxicity of methylparaben (MeP) an emerging contaminant, was analyzed in the sexual species Artemia franciscana, due to its presence in coastal areas and marine saltworks in the Mediterranean region. The acute toxicity (24h-LC50) of MeP in nauplii was tested and its chronic effect (9days) evaluated by measuring survival and growth under two sublethal concentrations (0.0085 and 0.017mg/L). Also, the effect on several key enzymes involved in: antioxidant defences (catalase (CAT) and gluthathion-S-transferase (GST)), neural activity (cholinesterase (ChE)) and xenobiotic biotransformation (carboxylesterase (CbE), was assessed after 48h under sublethal exposure...
April 17, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28427759/polymorphisms-in-cyp2c8-and-cyp3a5-genes-in-the-nigerian-population
#7
Ayorinde Adehin, Oluseye Oladotun Bolaji, Martin A Kennedy
Polymorphisms in CYP2C8 and CYP3A5 genes have implications for responses elicited by the ingestion of some xenobiotics, the metabolism of which are mediated by these enzymes. CYP2C8*2, CYP2C8*3, CYP3A5*3, CYP3A5*6 and CYP3A5*7 are a few functionally-relevant variants of these genes which this study provides data for, in the Nigerian population. Blood samples were processed for genomic DNA from 178 unrelated subjects spread across Nigerian ethnicities and screened for these polymorphism through the Sequenom iPLEX MassARRAY platform...
September 14, 2016: Drug Metabolism and Pharmacokinetics
https://www.readbyqxmd.com/read/28425971/%C3%AF-%C3%A2-cells-feature-de-ubiquitination-of-slc-transporters-and-increased-levels-and-fluxes-of-amino-acids
#8
André Bordinassi Medina, Marcin Banaszczak, Yang Ni, Ina Aretz, David Meierhofer
Solute carrier (SLC) transporters are a diverse group of membrane transporter proteins that regulate the cellular flux and distribution of endogenous and xenobiotic compounds. Post-translational modifications (PTMs), such as ubiquitination, have recently emerged as one of the major regulatory mechanisms in protein function and localization. Previously, we showed that SLC amino acid transporters were on average 6-fold de-ubiquitinated and increased amino acid levels were detected in ρ⁰ cells (lacking mitochondrial DNA, mtDNA) compared to parental cells...
April 20, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28425245/xenobiotic-drug-metabolizing-enzyme-and-tp53-polymorphisms-and-clinical-outcome-in-advanced-nonsmall-cell-lung-cancer-patients
#9
Volkan Karacaoğlan, Ahmet Oğuz Ada, Serdar Bilgen, Guzide Tuğba Çetinkaya, Emre Soydaş, Celalettin Semih Kunak, Sibel Meryem Alpar, Meral Gülhan, Mümtaz Işcan
BACKGROUND/AIM: The association between polymorphisms of xenobiotic/drug metabolizing enzymes and TP53 and response to chemotherapy and survival of patients with nonsmall cell lung cancer (NSCLC) are limited and inconclusive. In this study, CYP2E1*5B, CYP2E1*6, CYP2E1*7B, GSTO1 (A140D), and TP53 (Arg72Pro) polymorphisms and response to platinum-based chemotherapy and survival in 137 advanced stage NSCLC patients were investigated. MATERIALS AND METHODS: Genetic polymorphism analyses were determined by polymerase chain reaction (PCR) coupled with restriction fragment length polymorphism (RFLP)...
April 18, 2017: Turkish Journal of Medical Sciences
https://www.readbyqxmd.com/read/28418861/brain-derived-neurotrophic-factor-involved-epigenetic-repression-of-ugt2b7-in-colorectal-carcinoma-a-mechanism-to-alter-morphine-glucuronidation-in-tumor
#10
Zi-Zhao Yang, Li Li, Ming-Cheng Xu, Hai-Xing Ju, Miao Hao, Jing-Kai Gu, Zai-Jie Jim Wang, Hui-Di Jiang, Lu-Shan Yu, Su Zeng
Uridine diphosphate-glucuronosyltransferase (UGT) 2B7, as one of significant drug enzymes, is responsible on the glucuronidation of abundant endobiotics or xenobiotics. We here report that it is markedly repressed in the tumor tissues of colorectal carcinoma (CRC) patients. Accordingly, morphine in CRC cells will stimulate the expression of its main metabolic enzyme, UGT2B7 during tolerance generation by activating the positive signals in histone 3, especially for trimethylated lysine 27 (H3K4Me3) and acetylated lysine 4 (H3K27Ac)...
March 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28416420/identification-of-endogenous-biomarkers-to-predict-the-propensity-of-drug-candidates-to-cause-hepatic-or-renal-transporter-mediated-ddis
#11
REVIEW
Xiaoyan Chu, Grace Hoyee Chan, Raymond Evers
Drug transporters expressed in liver and kidney play a critical role in the elimination of a wide range of drugs and xenobiotics and inhibition of these transporters may therefore cause clinically significant drug-drug interactions (DDIs). Currently, in vitro transporter inhibition data are used to assess the risk that a drug candidate may act as an inhibitor of a transporter in patients at clinically relevant exposures. However, this approach is hampered by low confidence in in vitro to in vivo extrapolations, and large inter-system and inter-lab variability in in vitro data...
April 14, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28414290/-the-effect-of-isatin-on-protein-protein-interactions-between-cytochrome-b5-and-cytochromes-p450
#12
P V Ershov, E O Yablokov, Yu V Mezentsev, L A Kalushskiy, A V Florinskaya, A V Veselovsky, O V Gnedenko, A A Gilep, S A Usanov, A E Medvedev, A S Ivanov
Cytochromes P450 (CYP) are involved in numerous biochemical processes including metabolism of xenobiotics, biosynthesis of cholesterol, steroid hormones etc. Since some CYP catalyze indol oxidation to isatin, we have hypothesized that isatin can regulate protein-protein interactions (PPI) between components of the CYP system thus representing a (negative?) feedback mechanism. The aim of this study was to investigate a possible effect of isatin on interaction of human CYP with cytochrome b5 (CYB5A). Using the optical biosensor test system employing surface plasmon resonance (SPR) we have investigated interaction of immobilized CYB5A with various CYP in the absence and in the presence of isatin...
March 2017: Biomedit︠s︡inskai︠a︡ Khimii︠a︡
https://www.readbyqxmd.com/read/28414139/ligand-dependent-and-independent-regulation-of-human-hepatic-sphingomyelin-phosphodiesterase-acid-like-3a-expression-by-pregnane-x-receptor-and-crosstalk-with-liver-x-receptor
#13
Judith Jeske, Andreas Bitter, Wolfgang E Thasler, Thomas S Weiss, Matthias Schwab, Oliver Burk
Pregnane X receptor (PXR) mainly regulates xenobiotic metabolism and detoxification. Additionally, it exerts pleiotropic effects on liver physiology, which in large parts depend on transrepression of other liver-enriched transcription factors. Based on the hypothesis that lower expression levels of PXR may reduce the extent of this inhibition, an exploratory genome-wide transcriptomic profiling was performed using HepG2 cell clones with different expression levels of PXR. This screen and confirmatory real-time RT-PCR identified sphingomyelin phosphodiesterase acid-like (SMPDL) 3A, a novel nucleotide phosphodiesterase and phosphoramidase, as being up-regulated by PXR-deficiency...
April 13, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28413702/targeted-sequencing-identifies-genetic-polymorphisms-of-flavin-containing-monooxygenase-genes-contributing-to-susceptibility-of-nicotine-dependence-in-european-american-and-african-american
#14
Tian-Xiao Zhang, Nancy L Saccone, Laura J Bierut, John P Rice
BACKGROUND: Smoking is a leading cause of preventable death. Early studies based on samples of twins have linked the lifetime smoking practices to genetic predisposition. The flavin-containing monooxygenase (FMO) protein family consists of a group of enzymes that metabolize drugs and xenobiotics. Both FMO1 and FMO3 were potentially susceptible genes for nicotine metabolism process. METHODS: In this study, we investigated the potential of FMO genes to confer risk of nicotine dependence via deep targeted sequencing in 2,820 study subjects comprising 1,583 nicotine dependents and 1,237 controls from European American and African American...
April 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28413083/a-novel-nuclear-xenobiotic-receptors-ahr-pxr-car-mediated-mechanism-of-dehp-induced-cerebellar-toxicity-in-quails-coturnix-japonica-via-disrupting-cyp-enzyme-system-homeostasis
#15
Zheng-Hai Du, Jun Xia, Xiao-Chen Sun, Xue-Nan Li, Cong Zhang, Hua-Shan Zhao, Shi-Yong Zhu, Jin-Long Li
Di-(2-ethylhexyl)-phthalate (DEHP) is causing serious health hazard in wildlife animal and human through environment and food chain, including the effect of brain development and impacted neurobehavioral outcomes. However, DEHP exposure caused cerebellar toxicity in bird remains unclear. To evaluate DEHP-exerted potential neurotoxicity in cerebellum, male quails were exposed with 0, 250, 500 and 750 mg/kg BW/day DEHP by gavage treatment for 45 days. Neurobehavioral abnormality and cerebellar histopathological alternation were observed in DEHP-induced quails...
April 14, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28411869/detection-of-endocrine-disrupting-chemicals-and-evidence-of-their-effects-on-the-hpg-axis-of-the-european-anchovy-engraulis-encrasicolus
#16
Andrea Miccoli, Francesca Maradonna, Andrea De Felice, Vincenzo Caputo Barucchi, Andone Estonba, Michele Genangeli, Sauro Vittori, Iole Leonori, Oliana Carnevali
Natural/synthetic Endocrine Disrupting Chemicals (EDCs) may display estrogenic activity and a lower potency than 17β-estradiol. Nonetheless, their concentrations and additive effects can affect the endocrine system and reproductive processes related to the Hypothalamic-Pituitary-Gonadal (HPG) axis. Because of their persistence in both the environment and biological systems, they ultimately target multi-level predators, including humans. We detected presence and effects of xenobiotics on wild anchovy Engraulis encrasicolus in the Western Adriatic Sea...
April 5, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28411468/nine-co-localized-cytochrome-p450-genes-of-the-cyp2n-cyp2ad-and-cyp2p-gene-families-in-the-mangrove-killifish-kryptolebias-marmoratus-genome-identification-and-expression-in-response-to-b-%C3%AE-p-bpa-op-and-np
#17
Jayesh Puthumana, Bo-Mi Kim, Chang-Bum Jeong, Duck-Hyun Kim, Hye-Min Kang, Jee-Hyun Jung, Il-Chan Kim, Un-Ki Hwang, Jae-Seong Lee
The CYP2 genes are the largest and most diverse cytochrome P450 (CYP) subfamily in vertebrates. We have identified nine co-localized CYP2 genes (∼55kb) in a new cluster in the genome of the highly resilient ecotoxicological fish model Kryptolebias marmoratus. Molecular characterization, temporal and tissue-specific expression pattern, and response to xenobiotics of these genes were examined. The CYP2 gene clusters were characterized and designated CYP2N22-23, CYP2AD12, and CYP2P16-20. Gene synteny analysis confirmed that the cluster in K...
March 31, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28411389/the-comet-assay-in-folsomia-candida-a-suitable-approach-to-assess-genotoxicity-in-collembolans
#18
Diogo N Cardoso, Ana Rita R Silva, Andreia Cruz, Joana Lourenço, Joana Neves, Catarina Malheiro, Sónia Mendo, Amadeu M V M Soares, Susana Loureiro
The present study shows the comet assay technique being successfully applied for the first time to one of the most widely used soil organisms in standardized ecotoxicological tests, Folsomia candida, providing a step forward in assessing the genotoxicity induced by xenobiotics. Because collembolans have a high content of chitin, a new methodology was developed in which the heads of the collembolans were separated from the rest of the body, allowing the hemolymph to leak out. This procedure allows the cells to be released, and after lysis the genetic material is available for the comet assay...
March 16, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28409431/formetanate-toxicity-and-changes-in-antioxidant-enzyme-system-of-apis-mellifera-larvae
#19
Martin Staroň, Rastislav Sabo, Anna Sobeková, Lucia Sabová, Jaroslav Legáth, Ľuboslava Lohajová, Peter Javorský
Substantial percentage of world food production depends on pollinating service of honeybees that directly depends on their health status. Among other factors, the success of bee colonies depends on health of developed larvae. The crucial phase of larval development is the first 6 days after hatching when a worker larva grows exponentially and larvae are potentially exposed to xenobiotics via diet. In the present study, we determined the lethal concentration LC50 (72 h) following single dietary exposure of honeybee larvae to formetanate under laboratory conditions, being also the first report available in scientific literature...
April 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28408657/negative-regulation-of-human-pregnane-x-receptor-by-microrna-18a-5p-evidence-for-suppression-of-microrna-18a-5p-expression-by-rifampin-and-rilpivirine
#20
Devinder Sharma, Abdullah A Turkistani, Wenjun Chang, Catherine Hu, Zhaoming Xu, Thomas K H Chang
Small non-coding microRNAs act as post-transcriptional regulators of gene expression involved in diverse biological functions. Pregnane X receptor (PXR, NR1I2), which is a member of the superfamily of nuclear receptors, is a transcription factor governing the transport and biotransformation of various endobiotics and xenobiotics. In the present study, we identified a specific microRNA involved in regulating the expression and functionality of human PXR (hPXR). According to bioinformatics analysis employing three commonly used algorithms (TargetScan, miRanda, and DIANA-microT-CDS), miR-18a-5p was predicted to be the top candidate microRNA regulator of hPXR...
April 13, 2017: Molecular Pharmacology
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