LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 107

Search options

  1. Book: Correlated random systems

    Gayrard, Véronique

    five different methods ; CIRM Jean-Morlet Chair, Spring 2013

    (Lecture notes in mathematics : CIRM Jean-Morlet series ; 2143)

    2015  

    Institution Centre International de Rencontres Mathématiques
    Author's details Véronique Gayrard ... [ed.]
    Series title Lecture notes in mathematics : CIRM Jean-Morlet series ; 2143
    Language English
    Size VII, 205 S., graph. Darst., 235 mm x 155 mm
    Publisher Springer
    Publishing place Cham u.a.
    Document type Book
    Note Includes bibliographical references
    ISBN 3319176730 ; 9782856298107 ; 9783319176734 ; 9783319176741 ; 2856298109 ; 3319176749
    Database Former special subject collection: coastal and deep sea fishing

    More links

    Kategorien

  2. Article ; Online: Comparison of toxicokinetic properties of eleven analogues of Bisphenol A in pig after intravenous and oral administrations

    Gély, Clémence A. / Lacroix, Marlène Z. / Roques, Béatrice B. / Toutain, Pierre-Louis / Gayrard, Véronique / Picard-Hagen, Nicole

    Environment International. 2023 Jan., v. 171 p.107722-

    2023  

    Abstract: Due to the restrictions of its use, Bisphenol A (BPA) has been replaced by many structurally related bisphenols (BPs) in consumer products. The endocrine disrupting potential similar to that of BPA has been described for several bisphenols, there is ... ...

    Abstract Due to the restrictions of its use, Bisphenol A (BPA) has been replaced by many structurally related bisphenols (BPs) in consumer products. The endocrine disrupting potential similar to that of BPA has been described for several bisphenols, there is therefore an urgent need of toxicokinetic (TK) data for these emerging BPs in order to evaluate if their internal exposure could increase the risk of endocrine disruption. We investigated TK behaviors of eleven BPA substitutes (BPS, BPAF, BPB, BPF, BPM, BPZ, 3-3BPA, BP4-4, BPAP, BPP, and BPFL) by intravenous and oral administrations of mixtures of them to piglets and serial collection of blood over 72 h and urine over 24 h, to evaluate their disposition. Data were analyzed using nonlinear mixed-effects modeling and a comparison was made with TK predicted by the generic model HTTK package. The low urinary excretion of some BPs, in particular BPM, BPP and BPFL, is an important aspect to consider in predicting human exposure based on urine biomonitoring. Despite their structural similarities, for the same oral dose, all BPA analogues investigated showed a higher systemic exposure (area under the plasma concentration-time curve (AUC) of the unconjugated Bisphenol) than BPA (2 to 4 fold for 3-3BPA, BPAF, BPB and BPZ, 7–20 fold for BP4-4, BPAP, BPP, BPFL, BPF and BPM and 150 fold for BPS) due mainly to a considerable variation of oral bioavailability (proportion of BP administered by oral route that attains the systemic circulation unchanged). Given similarities in the digestive tract between pigs and humans, our TK data suggest that replacing BPA with some of its alternatives, particularly BPS, will likely lead to higher internal exposure to potential endocrine disruptive compounds. These findings are crucial for evaluating the risk of human exposure to these emerging BPs.
    Keywords bioavailability ; bisphenol A ; blood ; digestive tract ; environment ; environmental monitoring ; excretion ; humans ; intravenous injection ; nonlinear mixed effects models ; oral administration ; risk ; swine ; urine ; Bisphenols ; Toxicokinetics ; Oral exposure ; Mixture ; Pig model ; TK ; BPs ; BPF ; BPA ; BPB ; BPAF ; 3-3BPA ; BPZ ; BPM ; BPS ; BP4-4 ; BPAP ; BPFL ; BPP ; DHDPE ; QC ; UHPLC ; NCA ; NLME ; HTTK ; AUC ; MRT ; Cl ; F ; Cl_F ; HL
    Language English
    Dates of publication 2023-01
    Publishing place Elsevier Ltd
    Document type Article ; Online
    ZDB-ID 554791-x
    ISSN 1873-6750 ; 0160-4120
    ISSN (online) 1873-6750
    ISSN 0160-4120
    DOI 10.1016/j.envint.2022.107722
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  3. Article ; Online: Doxycycline serum protein binding in pigs reveals a relatively high free fraction

    Portugal, Felipe Ramon / Lacroix, Marlène Z. / Roques, Béatrice B. / Gayrard, Véronique / Toutain, Pierre‐Louis / Bousquet‐Mélou, Alain

    Journal of Veterinary Pharmacology and Therapeutics. 2023 Mar., v. 46, no. 2 p.112-118

    2023  

    Abstract: Doxycycline is an antibiotic widely used in pig farming. As with all antibiotics, only the free concentrations are considered to be bacteriologically active. Historically, the free fraction (fu) in pig plasma has been estimated at 7%, which, given the ... ...

    Abstract Doxycycline is an antibiotic widely used in pig farming. As with all antibiotics, only the free concentrations are considered to be bacteriologically active. Historically, the free fraction (fu) in pig plasma has been estimated at 7%, which, given the effective dosage regime used in pigs, leads to free plasma concentrations of doxycycline largely lower than the minimum inhibitory concentrations of the target pathogens. This apparent inconsistency led us to reassess plasma protein binding of doxycycline in pigs. Using an equilibrium dialysis method, the extent of doxycycline binding was measured individually in 26 pigs for total doxycycline concentration ranging from 10 to 1000 μmol/L. Analysis of the data using a non‐linear mixed‐effects model demonstrated linearity of plasma protein binding with a mean fu value of 31% and a relatively low inter‐subject variability of approximately 10%. This new data showing that the free fraction is four times greater than what could have been anticipated from historical data is discussed in particular for the calculation of the PK/PD cut‐offs, which are used to establish the clinical breakpoints for antimicrobial susceptibility testing.
    Keywords antibiotic resistance ; blood proteins ; dialysis ; doxycycline ; models ; pharmacology ; swine ; therapeutics
    Language English
    Dates of publication 2023-03
    Size p. 112-118.
    Publishing place John Wiley & Sons, Ltd
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ZDB-ID 435216-6
    ISSN 1365-2885 ; 0140-7783
    ISSN (online) 1365-2885
    ISSN 0140-7783
    DOI 10.1111/jvp.13111
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  4. Book ; Online: Correlated Random Systems: Five Different Methods

    Gayrard, Véronique / Kistler, Nicola

    CIRM Jean-Morlet Chair, Spring 2013

    (Lecture Notes in Mathematics ; 2143)

    2015  

    Abstract: This volume presents five different methods recently developed to tackle the large scale behavior of highly correlated random systems, such as spin glasses, random polymers, local times and loop soups and random matrices. These methods, presented in a ... ...

    Author's details edited by Véronique Gayrard, Nicola Kistler
    Series title Lecture Notes in Mathematics ; 2143
    Abstract This volume presents five different methods recently developed to tackle the large scale behavior of highly correlated random systems, such as spin glasses, random polymers, local times and loop soups and random matrices. These methods, presented in a series of lectures delivered within the Jean-Morlet initiative (Spring 2013), play a fundamental role in the current development of probability theory and statistical mechanics. The lectures were: Random Polymers by E. Bolthausen, Spontaneous Replica Symmetry Breaking and Interpolation Methods by F. Guerra, Derrida's Random Energy Models by N. Kistler, Isomorphism Theorems by J. Rosen and Spectral Properties of Wigner Matrices by B. Schlein. This book is the first in a co-edition between the Jean-Morlet Chair at CIRM and the Springer Lecture Notes in Mathematics which aims to collect together courses and lectures on cutting-edge subjects given during the term of the Jean-Morlet Chair, as well as new material produced in its wake. It is targeted at researchers, in particular PhD students and postdocs, working in probability theory and statistical physics
    Keywords Distribution (Probability theory) ; Mathematical physics ; Mathematics
    Language English
    Size Online-Ressource (VII, 205 p. 9 illus., 8 illus. in color), online resource
    Publisher Springer International Publishing
    Publishing place Cham ;s.l
    Document type Book ; Online
    ISBN 9783319176734 ; 9783319176741 ; 3319176730 ; 3319176749
    DOI 10.1007/978-3-319-17674-1
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

    More links

    Kategorien

  5. Article ; Online: Are BPA Substitutes as Obesogenic as BPA?

    Oliviero, Fabiana / Marmugi, Alice / Viguié, Catherine / Gayrard, Véronique / Picard-Hagen, Nicole / Mselli-Lakhal, Laila

    International journal of molecular sciences

    2022  Volume 23, Issue 8

    Abstract: Metabolic diseases, such as obesity, Type II diabetes and hepatic steatosis, are a significant public health concern affecting more than half a billion people worldwide. The prevalence of these diseases is constantly increasing in developed countries, ... ...

    Abstract Metabolic diseases, such as obesity, Type II diabetes and hepatic steatosis, are a significant public health concern affecting more than half a billion people worldwide. The prevalence of these diseases is constantly increasing in developed countries, affecting all age groups. The pathogenesis of metabolic diseases is complex and multifactorial. Inducer factors can either be genetic or linked to a sedentary lifestyle and/or consumption of high-fat and sugar diets. In 2002, a new concept of "environmental obesogens" emerged, suggesting that environmental chemicals could play an active role in the etiology of obesity. Bisphenol A (BPA), a xenoestrogen widely used in the plastic food packaging industry has been shown to affect many physiological functions and has been linked to reproductive, endocrine and metabolic disorders and cancer. Therefore, the widespread use of BPA during the last 30 years could have contributed to the increased incidence of metabolic diseases. BPA was banned in baby bottles in Canada in 2008 and in all food-oriented packaging in France from 1 January 2015. Since the BPA ban, substitutes with a similar structure and properties have been used by industrials even though their toxic potential is unknown. Bisphenol S has mainly replaced BPA in consumer products as reflected by the almost ubiquitous human exposure to this contaminant. This review focuses on the metabolic effects and targets of BPA and recent data, which suggest comparable effects of the structural analogs used as substitutes.
    MeSH term(s) Benzhydryl Compounds/toxicity ; Diabetes Mellitus, Type 2 ; Endocrine Disruptors/toxicity ; Humans ; Obesity/chemically induced ; Phenols
    Chemical Substances Benzhydryl Compounds ; Endocrine Disruptors ; Phenols ; bisphenol A (MLT3645I99)
    Language English
    Publishing date 2022-04-11
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms23084238
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: Steatosis and Metabolic Disorders Associated with Synergistic Activation of the CAR/RXR Heterodimer by Pesticides.

    Dauwe, Yannick / Mary, Lucile / Oliviero, Fabiana / Grimaldi, Marina / Balaguer, Patrick / Gayrard, Véronique / Mselli-Lakhal, Laïla

    Cells

    2023  Volume 12, Issue 8

    Abstract: The nuclear receptor, constitutive androstane receptor (CAR), which forms a heterodimer with the retinoid X receptor (RXR), was initially reported as a transcription factor that regulates hepatic genes involved in detoxication and energy metabolism. ... ...

    Abstract The nuclear receptor, constitutive androstane receptor (CAR), which forms a heterodimer with the retinoid X receptor (RXR), was initially reported as a transcription factor that regulates hepatic genes involved in detoxication and energy metabolism. Different studies have shown that CAR activation results in metabolic disorders, including non-alcoholic fatty liver disease, by activating lipogenesis in the liver. Our objective was to determine whether synergistic activations of the CAR/RXR heterodimer could occur in vivo as described in vitro by other authors, and to assess the metabolic consequences. For this purpose, six pesticides, ligands of CAR, were selected, and Tri-butyl-tin (TBT) was used as an RXR agonist. In mice, CAR's synergic activation was induced by dieldrin associated with TBT, and combined effects were induced by propiconazole, bifenox, boscalid, and bupirimate. Moreover, a steatosis, characterized by increased triglycerides, was observed when TBT was combined with dieldrin, propiconazole, bifenox, boscalid, and bupirimate. Metabolic disruption appeared in the form of increased cholesterol and lowered free fatty acid plasma levels. An in-depth analysis revealed increased expression of genes involved in lipid synthesis and lipid import. These results contribute to the growing understanding of how environmental contaminants can influence nuclear receptor activity and associated health risks.
    MeSH term(s) Animals ; Mice ; Constitutive Androstane Receptor ; Retinoid X Receptors/metabolism ; Pesticides/toxicity ; Dieldrin ; Receptors, Cytoplasmic and Nuclear ; Non-alcoholic Fatty Liver Disease ; Metabolic Diseases ; Lipids
    Chemical Substances Constitutive Androstane Receptor ; 2-chloro-N-(4-chlorobiphenyl-2-yl)nicotinamide (32MS8ZRD1V) ; bifenox (KSB85XT26Y) ; bupirimate (41483-43-6) ; Retinoid X Receptors ; Pesticides ; Dieldrin (I0246D2ZS0) ; Receptors, Cytoplasmic and Nuclear ; Lipids
    Language English
    Publishing date 2023-04-21
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2661518-6
    ISSN 2073-4409 ; 2073-4409
    ISSN (online) 2073-4409
    ISSN 2073-4409
    DOI 10.3390/cells12081201
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: Contribution of Reliable Chromatographic Data in QSAR for Modelling Bisphenol Transport across the Human Placenta Barrier.

    Gély, Clémence A / Picard-Hagen, Nicole / Chassan, Malika / Garrigues, Jean-Christophe / Gayrard, Véronique / Lacroix, Marlène Z

    Molecules (Basel, Switzerland)

    2023  Volume 28, Issue 2

    Abstract: Regulatory measures and public concerns regarding bisphenol A (BPA) have led to its replacement by structural analogues, such as BPAF, BPAP, BPB, BPF, BPP, BPS, and BPZ. However, these alternatives are under surveillance for potential endocrine ... ...

    Abstract Regulatory measures and public concerns regarding bisphenol A (BPA) have led to its replacement by structural analogues, such as BPAF, BPAP, BPB, BPF, BPP, BPS, and BPZ. However, these alternatives are under surveillance for potential endocrine disruption, particularly during the critical period of fetal development. Despite their structural analogies, these BPs differ greatly in their placental transport efficiency. For predicting the fetal exposure of this important class of emerging contaminants, quantitative structure-activity relationship (QSAR) studies were developed to model and predict the placental clearance indices (CI). The most usual input parameters were molecular descriptors obtained by modelling, but for bisphenols (BPs) with structural similarities or heteroatoms such as sulfur, these descriptors do not contrast greatly. This study evaluated and compared the capacity of QSAR models based either on molecular or chromatographic descriptors or a combination of both to predict the placental passage of BPs. These chromatographic descriptors include both the retention mechanism and the peak shape on columns that reflect specific molecular interactions between solute and stationary and mobile phases and are characteristic of the molecular structure of BPs. The chromatographic peak shape such as the asymmetry and tailing factors had more influence on predicting the placental passage than the usual retention parameters. Furthermore, the QSAR model, having the best prediction capacity, was obtained with the chromatographic descriptors alone and met the criteria of internal and cross validation. These QSAR models are crucial for predicting the fetal exposure of this important class of emerging contaminants.
    MeSH term(s) Pregnancy ; Humans ; Female ; Placenta ; Quantitative Structure-Activity Relationship ; Benzhydryl Compounds ; Phenols
    Chemical Substances bisphenol A (MLT3645I99) ; Benzhydryl Compounds ; Phenols
    Language English
    Publishing date 2023-01-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules28020500
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: CAR Protects Females from Diet-Induced Steatosis and Associated Metabolic Disorders.

    Oliviero, Fabiana / Klement, Wendy / Mary, Lucile / Dauwe, Yannick / Lippi, Yannick / Naylies, Claire / Gayrard, Véronique / Marchi, Nicola / Mselli-Lakhal, Laila

    Cells

    2023  Volume 12, Issue 18

    Abstract: Non-Alcoholic Fatty Liver Disease (NAFLD) is the most common cause of chronic liver disease worldwide, affecting 70-90% of obese individuals. In humans, a lower NAFLD incidence is reported in pre-menopausal women, although the mechanisms affording this ... ...

    Abstract Non-Alcoholic Fatty Liver Disease (NAFLD) is the most common cause of chronic liver disease worldwide, affecting 70-90% of obese individuals. In humans, a lower NAFLD incidence is reported in pre-menopausal women, although the mechanisms affording this protection remain under-investigated. Here, we tested the hypothesis that the constitutive androstane nuclear receptor (CAR) plays a role in the pathogenesis of experimental NAFLD. Male and female wild-type (WT) and CAR knock-out (CAR-/-) mice were subjected to a high-fat diet (HFD) for 16 weeks. We examined the metabolic phenotype of mice through body weight follow-up, glucose tolerance tests, analysis of plasmatic metabolic markers, hepatic lipid accumulation, and hepatic transcriptome. Finally, we examined the potential impact of HFD and CAR deletion on specific brain regions, focusing on glial cells. HFD-induced weight gain and hepatic steatosis are more pronounced in WT males than females. CAR-/- females present a NASH-like hepatic transcriptomic signature suggesting a potential NAFLD to NASH transition. Transcriptomic correlation analysis highlighted a possible cross-talk between CAR and ERα receptors. The peripheral effects of CAR deletion in female mice were associated with astrogliosis in the hypothalamus. These findings prove that nuclear receptor CAR may be a potential mechanism entry-point and a therapeutic target for treating NAFLD/NASH.
    MeSH term(s) Female ; Male ; Humans ; Animals ; Mice ; Non-alcoholic Fatty Liver Disease/etiology ; Metabolic Diseases ; Diet, High-Fat/adverse effects ; Obesity ; Body Weight
    Language English
    Publishing date 2023-09-06
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2661518-6
    ISSN 2073-4409 ; 2073-4409
    ISSN (online) 2073-4409
    ISSN 2073-4409
    DOI 10.3390/cells12182218
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: Doxycycline serum protein binding in pigs reveals a relatively high free fraction.

    Portugal, Felipe Ramon / Lacroix, Marlène Z / Roques, Béatrice B / Gayrard, Véronique / Toutain, Pierre-Louis / Bousquet-Mélou, Alain

    Journal of veterinary pharmacology and therapeutics

    2023  Volume 46, Issue 2, Page(s) 112–118

    Abstract: Doxycycline is an antibiotic widely used in pig farming. As with all antibiotics, only the free concentrations are considered to be bacteriologically active. Historically, the free fraction (fu) in pig plasma has been estimated at 7%, which, given the ... ...

    Abstract Doxycycline is an antibiotic widely used in pig farming. As with all antibiotics, only the free concentrations are considered to be bacteriologically active. Historically, the free fraction (fu) in pig plasma has been estimated at 7%, which, given the effective dosage regime used in pigs, leads to free plasma concentrations of doxycycline largely lower than the minimum inhibitory concentrations of the target pathogens. This apparent inconsistency led us to reassess plasma protein binding of doxycycline in pigs. Using an equilibrium dialysis method, the extent of doxycycline binding was measured individually in 26 pigs for total doxycycline concentration ranging from 10 to 1000 μmol/L. Analysis of the data using a non-linear mixed-effects model demonstrated linearity of plasma protein binding with a mean fu value of 31% and a relatively low inter-subject variability of approximately 10%. This new data showing that the free fraction is four times greater than what could have been anticipated from historical data is discussed in particular for the calculation of the PK/PD cut-offs, which are used to establish the clinical breakpoints for antimicrobial susceptibility testing.
    MeSH term(s) Animals ; Swine ; Doxycycline ; Protein Binding ; Anti-Bacterial Agents ; Blood Proteins
    Chemical Substances Doxycycline (N12000U13O) ; Anti-Bacterial Agents ; Blood Proteins
    Language English
    Publishing date 2023-01-24
    Publishing country England
    Document type Journal Article
    ZDB-ID 435216-6
    ISSN 1365-2885 ; 0140-7783
    ISSN (online) 1365-2885
    ISSN 0140-7783
    DOI 10.1111/jvp.13111
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article ; Online: Comparison of the materno-fetal transfer of fifteen structurally related bisphenol analogues using an ex vivo human placental perfusion model.

    Gély, Clémence A / Lacroix, Marlène Z / Morin, Mathieu / Vayssière, Christophe / Gayrard, Véronique / Picard-Hagen, Nicole

    Chemosphere

    2021  Volume 276, Page(s) 130213

    Abstract: Regulatory measures and public concerns regarding bisphenol A (BPA) have led to its replacement by a variety of alternatives in consumer products. Due to their structural similarity to BPA, these alternatives are under surveillance, however, for ... ...

    Abstract Regulatory measures and public concerns regarding bisphenol A (BPA) have led to its replacement by a variety of alternatives in consumer products. Due to their structural similarity to BPA, these alternatives are under surveillance, however, for potential endocrine disruption. Understanding the materno-fetal transfer of these BPA-related alternatives across the placenta is therefore crucial to assess prenatal exposure risks. The objective of the study was to assess and compare the placental transfer of a set of 15 selected bisphenols (BPs) (BP 4-4, BPA, BPAF, BPAP, 3-3 BPA, BPB, BPBP, BPC, BPE, BPF, BPFL, BPM, BPP, BPS and BPZ) using the ex vivo human placental perfusion model. The UHPLC-MS/MS method for simultaneous quantification of these BPs in perfusion media, within a concentration range of 0.003-5 μM, was able to measure placenta transfer rates as low as 0.6%-4%. Despite their structural similarities, these BPs differed greatly in placental transport efficiency. The placental transfer rates of BP4-4, BPAP, BPE, BPF, 3-3BPA, BPB, BPA were similar to that of antipyrine, indicating that their main transport mechanism was passive diffusion. By contrast, the placental transfer rates of BPFL and BPS were very limited, and intermediate for BPBP, BPZ, BPC, BPM, BPP and BPAF, suggesting weak diffusional permeability and/or that their passage might involve efflux transport. These placental transfer data will be particularly useful for predicting the fetal exposure of this important class of emerging contaminants.
    MeSH term(s) Benzhydryl Compounds ; Female ; Humans ; Perfusion ; Phenols ; Placenta ; Pregnancy ; Tandem Mass Spectrometry
    Chemical Substances Benzhydryl Compounds ; Phenols ; bisphenol A (MLT3645I99)
    Language English
    Publishing date 2021-03-15
    Publishing country England
    Document type Journal Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2021.130213
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top