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  1. Article ; Online: A PBPK model to evaluate zebrafish eleutheroembryos’ actual exposure: bisphenol A and analogs’ (AF, F, and S) case studies [Correction: Jan. 2023, 30(3), p. 7654]

    Billat, Pierre-André / Brochot, Céline / Brion, François / Beaudouin, Rémy

    Environ Sci Pollut Res. 2023 Jan., v. 30, no. 3, p. 7640-7653

    2023  , Page(s) 7640–7653

    Abstract: The zebrafish eleutheroembryo model is increasingly used to assess the toxicity and developmental adverse effects of xenobiotics. However, the actual exposure is seldom measured (poorly accessible), while a predictive model could estimate these ... ...

    Abstract The zebrafish eleutheroembryo model is increasingly used to assess the toxicity and developmental adverse effects of xenobiotics. However, the actual exposure is seldom measured (poorly accessible), while a predictive model could estimate these concentrations. The predictions with a new eleutheroembryo physiologically based pharmacokinetic (PBPK) model have been evaluated using datasets obtained from literature data for several bisphenols. The model simulated the toxicokinetics of bisphenols A (BPA), AF, F, and S through the eleutheroembryo tissues while considering the body and organ growth. We further improved the predictions by adding dynamic flows through the embryo and/or its chorion, impact of experimental temperature, metabolic clearance, and saturation of the absorption by Bayesian calibration. The model structure was determined using the BPA dataset and generalized to the other bisphenols. This model revealed the central role of the chorion in the compound uptake in the first 48 h post-fertilization. The predictions for the BPA substitutes estimated by our PBPK model were compared to available toxicokinetics data for zebrafish embryos, and 63% and 88% of them were within a twofold and fivefold error intervals of the corresponding experimental values, respectively. This model provides a tool to design new eleutheroembryo assays and evaluate the actual exposure.
    Keywords Bayesian theory ; Danio rerio ; absorption ; bisphenol A ; chorion ; data collection ; models ; pharmacokinetics ; temperature ; toxicity ; xenobiotics
    Language English
    Dates of publication 2023-01
    Size p. 7640-7653
    Publishing place Springer Berlin Heidelberg
    Document type Article ; Online
    ZDB-ID 1178791-0
    ISSN 1614-7499 ; 0944-1344
    ISSN (online) 1614-7499
    ISSN 0944-1344
    DOI 10.1007/s11356-022-22741-2
    Database NAL-Catalogue (AGRICOLA)

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  2. Article ; Online: Correction to: A PBPK model to evaluate zebrafish eleutheroembryos' actual exposure: bisphenol A and analogs' (AF, F, and S) case studies.

    Billat, Pierre-André / Brochot, Céline / Brion, François / Beaudouin, Rémy

    Environmental science and pollution research international

    2022  Volume 30, Issue 3, Page(s) 7654

    Language English
    Publishing date 2022-09-09
    Publishing country Germany
    Document type Published Erratum
    ZDB-ID 1178791-0
    ISSN 1614-7499 ; 0944-1344
    ISSN (online) 1614-7499
    ISSN 0944-1344
    DOI 10.1007/s11356-022-22994-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: A PBPK model to evaluate zebrafish eleutheroembryos' actual exposure: bisphenol A and analogs' (AF, F, and S) case studies.

    Billat, Pierre-André / Brochot, Céline / Brion, François / Beaudouin, Rémy

    Environmental science and pollution research international

    2022  Volume 30, Issue 3, Page(s) 7640–7653

    Abstract: The zebrafish eleutheroembryo model is increasingly used to assess the toxicity and developmental adverse effects of xenobiotics. However, the actual exposure is seldom measured (poorly accessible), while a predictive model could estimate these ... ...

    Abstract The zebrafish eleutheroembryo model is increasingly used to assess the toxicity and developmental adverse effects of xenobiotics. However, the actual exposure is seldom measured (poorly accessible), while a predictive model could estimate these concentrations. The predictions with a new eleutheroembryo physiologically based pharmacokinetic (PBPK) model have been evaluated using datasets obtained from literature data for several bisphenols. The model simulated the toxicokinetics of bisphenols A (BPA), AF, F, and S through the eleutheroembryo tissues while considering the body and organ growth. We further improved the predictions by adding dynamic flows through the embryo and/or its chorion, impact of experimental temperature, metabolic clearance, and saturation of the absorption by Bayesian calibration. The model structure was determined using the BPA dataset and generalized to the other bisphenols. This model revealed the central role of the chorion in the compound uptake in the first 48 h post-fertilization. The predictions for the BPA substitutes estimated by our PBPK model were compared to available toxicokinetics data for zebrafish embryos, and 63% and 88% of them were within a twofold and fivefold error intervals of the corresponding experimental values, respectively. This model provides a tool to design new eleutheroembryo assays and evaluate the actual exposure.
    MeSH term(s) Animals ; Zebrafish/metabolism ; Bayes Theorem ; Benzhydryl Compounds/toxicity ; Benzhydryl Compounds/metabolism ; Phenols/toxicity ; Phenols/metabolism
    Chemical Substances bisphenol A (MLT3645I99) ; Benzhydryl Compounds ; Phenols
    Language English
    Publishing date 2022-08-31
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1178791-0
    ISSN 1614-7499 ; 0944-1344
    ISSN (online) 1614-7499
    ISSN 0944-1344
    DOI 10.1007/s11356-022-22741-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Embryonic exposures to chemicals acting on brain aromatase lead to different locomotor effects in zebrafish larvae.

    Blanc-Legendre, Mélanie / Sire, Sacha / Christophe, Armelle / Brion, François / Bégout, Marie-Laure / Cousin, Xavier

    Environmental toxicology and pharmacology

    2023  Volume 102, Page(s) 104221

    Abstract: Pathways underlying neurodevelopmental effects of endocrine disruptors (EDs) remain poorly known. Expression of brain aromatase (aroB), responsible for estrogen production in the brain of teleosts, is regulated by estrogenic EDs and could play a role in ... ...

    Abstract Pathways underlying neurodevelopmental effects of endocrine disruptors (EDs) remain poorly known. Expression of brain aromatase (aroB), responsible for estrogen production in the brain of teleosts, is regulated by estrogenic EDs and could play a role in their behavioral effects. We exposed zebrafish eleutheroembryos (0-120 h post-fertilization) to various concentrations of 16 estrogenic chemicals (incl. bisphenols and contraceptives), and of 2 aroB inhibitors. Behavior was monitored using a photomotor response test procedure. Both aroB inhibitors (clotrimazole and prochloraz) and a total of 6 estrogenic EDs induced significant behavioral alterations, including DM-BPA, BPC and BPS-MPE, three bisphenol substitutes which behavioral effects were, to our knowledge, previously unknown. However, no consensus was reported on the effects among tested substances. It appears that behavioral changes could not be linked to groups of substances defined by their specificity or potency to modulate aroB expression, or by their structure. Altogether, behavioral effects of estrogenic EDs in 120 h post-fertilization larvae appear unrelated to aroB but are nonetheless not to be neglected in the context of environmental safety.
    MeSH term(s) Animals ; Zebrafish/metabolism ; Aromatase/metabolism ; Larva/metabolism ; Estrogens/pharmacology ; Brain ; Benzhydryl Compounds/toxicity ; Endocrine Disruptors/metabolism
    Chemical Substances Aromatase (EC 1.14.14.1) ; Estrogens ; Benzhydryl Compounds ; Endocrine Disruptors
    Language English
    Publishing date 2023-07-13
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1318302-3
    ISSN 1872-7077 ; 1382-6689
    ISSN (online) 1872-7077
    ISSN 1382-6689
    DOI 10.1016/j.etap.2023.104221
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Interlaboratory prevalidation of a new in vitro transcriptional activation assay for the screening of (anti-)androgenic activity of chemicals using the UALH-hAR cell line.

    Garoche, Clémentine / Grimaldi, Marina / Michelin, Erwan / Boulahtouf, Abdelhay / Marconi, Anthony / Brion, François / Balaguer, Patrick / Aït-Aïssa, Selim

    Toxicology in vitro : an international journal published in association with BIBRA

    2023  Volume 88, Page(s) 105554

    Abstract: We report an interlaboratory evaluation of a recently developed androgen receptor (AR) transactivation assay using the UALH-hAR reporter cell line that stably expresses the luciferase gene under the transcriptional control of androgen receptor elements ( ... ...

    Abstract We report an interlaboratory evaluation of a recently developed androgen receptor (AR) transactivation assay using the UALH-hAR reporter cell line that stably expresses the luciferase gene under the transcriptional control of androgen receptor elements (AREs) with no glucocorticoid receptor (GR) crosstalk. Herein, a two-step prevalidation study involving three laboratories was conducted to assess performance criteria of the method such as transferability as well as robustness, sensitivity, and specificity. The first step consisted in the validation of the transfer of the cell line to participant laboratories through the testing of three reference chemicals: the AR agonist dihydrotestosterone, the AR antagonist hydroxyflutamide and the glucocorticoid dexamethasone. Secondly, a blinded study was conducted by screening a selection of ten chemicals, including four AR agonists, five AR antagonists, and one non-active chemical. All test compounds yielded the same activity profiles in all laboratories. The logEC
    MeSH term(s) Humans ; Androgen Antagonists/pharmacology ; Androgen Receptor Antagonists/pharmacology ; Androgens ; Cell Line ; Receptors, Androgen/genetics ; Receptors, Androgen/metabolism ; Reproducibility of Results ; Transcriptional Activation ; Drug Evaluation, Preclinical
    Chemical Substances Androgen Antagonists ; Androgen Receptor Antagonists ; Androgens ; Receptors, Androgen
    Language English
    Publishing date 2023-01-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 639064-x
    ISSN 1879-3177 ; 0887-2333
    ISSN (online) 1879-3177
    ISSN 0887-2333
    DOI 10.1016/j.tiv.2023.105554
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  6. Article ; Online: PBTK modeled perfluoroalkyl acid kinetics in zebrafish eleutheroembryos suggests impacts on bioconcentrations by chorion porosity dynamics.

    Billat, Pierre-André / Vogs, Carolina / Blassiau, Clément / Brochot, Céline / Wincent, Emma / Brion, François / Beaudouin, Rémy

    Toxicology in vitro : an international journal published in association with BIBRA

    2023  Volume 89, Page(s) 105588

    Abstract: The zebrafish eleutheroembryo (zfe) is widely used as a model to characterize the toxicity of chemicals. However, analytical methods are still missing to measure organ concentrations. Therefore, physiologically-based toxicokinetic (PBTK) modeling may ... ...

    Abstract The zebrafish eleutheroembryo (zfe) is widely used as a model to characterize the toxicity of chemicals. However, analytical methods are still missing to measure organ concentrations. Therefore, physiologically-based toxicokinetic (PBTK) modeling may overcome current limitations to help understand the relationship between toxic effects and internal exposure in various organs. A previous PBTK model has been updated to include the chorionic transport barrier and its permeabilization, hatching dynamics within a zfe population over development, and active mediated transport mechanisms. The zfe PBTK model has been calibrated using measured time-dependent internal concentrations of PFBA, PFHxS, PFOA, and PFOS in a zfe population and evaluated using external datasets from the literature. Calibration was successful with 96% of the predictions falling within a 2-fold range of the observed concentrations. The external dataset was correctly estimated with about 50% of the predictions falling within a factor of 3 of the observed data and 10% of the predictions are out of the 10-fold error. The calibrated model suggested that active mediated transport differs between PFAS with a sulfonic and carboxylic acid functional end groups. This PBTK model predicts well the fate of PFAS with various physicochemical properties in zfe. Therefore, this model may improve the use of zfe as an alternative model in toxicokinetic-toxicodynamic studies and help to refine and reduce zfe-based experiments, while giving insights into the internal kinetics of chemicals.
    MeSH term(s) Animals ; Zebrafish ; Bioaccumulation ; Kinetics ; Porosity ; Fluorocarbons/toxicity
    Chemical Substances Fluorocarbons
    Language English
    Publishing date 2023-03-21
    Publishing country England
    Document type Journal Article
    ZDB-ID 639064-x
    ISSN 1879-3177 ; 0887-2333
    ISSN (online) 1879-3177
    ISSN 0887-2333
    DOI 10.1016/j.tiv.2023.105588
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: A comparison of behavioral and reproductive parameters between wild-type, transgenic and mutant zebrafish: Could they all be considered the same “zebrafish” for reglementary assays on endocrine disruption?

    De Oliveira, Julie / Chadili, Edith / Turies, Cyril / Brion, François / Cousin, Xavier / Hinfray, Nathalie

    Comparative biochemistry and physiology. 2021 Jan., v. 239

    2021  

    Abstract: Transgenic zebrafish models are efficiently used to study the effects of endocrine disrupting chemicals (EDC); thereby informing on their mechanisms of action. However, given the reported differences between zebrafish strains at the genetical, ... ...

    Abstract Transgenic zebrafish models are efficiently used to study the effects of endocrine disrupting chemicals (EDC); thereby informing on their mechanisms of action. However, given the reported differences between zebrafish strains at the genetical, physiological and behavioral levels; care should be taken before using these transgenic models for EDC testing. In the present study, we undertook a set of experiments in different transgenic and/or mutant zebrafish strains of interest for EDC testing: casper, cyp19a1a-eGFP, cyp19a1a-eGFP-casper, cyp11c1-eGFP, cyp11c1-eGFP-casper. Some behavioral traits, and some biochemical and reproductive physiological endpoints commonly used in EDC testing were assessed and compared to those obtained in WT AB zebrafish to ensure that transgene insertion and/or mutations do not negatively modify basal reproductive physiology or behavior of the fish.Behavioral traits considered as anxiety and sociality have been monitored. Sociality was evaluated by monitoring the time spent near congeners in a shuttle box while anxiety was evaluated using the Novel tank diving test. No critical difference was observed between strains for either sociality or anxiety level. Concerning reproduction, no significant difference in the number of eggs laid per female, in the viability of eggs or in the female circulating VTG concentrations was noted between the 5 transgenic/mutants and the WT AB zebrafish studied.In summary, the transgene insertion and the mutations had no influence on the endpoints measured in basal conditions. These results were a prerequisite to the use of these transgenic/mutant models for EDC testing. Next step will be to determine the sensitivity of these biological models to chemical exposure to accurately validate their use in existing fish assays for EDC testing.
    Keywords Danio rerio ; anxiety ; biochemistry ; females ; fish ; genetically modified organisms ; mutants ; reproduction ; social behavior ; transgenes ; viability
    Language English
    Dates of publication 2021-01
    Publishing place Elsevier Inc.
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 189285-x
    ISSN 0306-4492 ; 0742-8413 ; 1532-0456
    ISSN 0306-4492 ; 0742-8413 ; 1532-0456
    DOI 10.1016/j.cbpc.2020.108879
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: ReadEDTest: A tool to assess the readiness of in vitro test methods under development for identifying endocrine disruptors

    Crouzet, Thibault / Grignard, Elise / Brion, François / Blanc, Etienne B. / Podechard, Normand / Langouet, Sophie / Alonso-Magdalena, Paloma / Hubert, Philippe / Kim, Min-ji / Audouze, Karine

    Environment International. 2023 Apr., v. 174 p.107910-

    2023  

    Abstract: Growing evidence shows that endocrine disruptors (EDs), known to affect the reproductive system, may also disturb other hormone-regulated functions leading to cancers, neurodevelopmental defects, metabolic and immune diseases. To reduce exposure to EDs ... ...

    Abstract Growing evidence shows that endocrine disruptors (EDs), known to affect the reproductive system, may also disturb other hormone-regulated functions leading to cancers, neurodevelopmental defects, metabolic and immune diseases. To reduce exposure to EDs and limit their health effects, development of screening and mechanism-based assays to identify EDs is encouraged. Nevertheless, the crucial validation step of test methods by regulatory bodies is a time- and resource-consuming process. One of the main raisons of this long duration process is that method developers, mainly researchers, are not fully aware of the regulatory needs to validate a test. We propose an online self-assessment questionnaire (SAQ) called ReadEDTest easy to be used by all researchers. The aim of ReadEDTest is to speed up the validation process by assessing readiness criteria of in vitro and fish embryo ED test methods under development. The SAQ is divided into 7 sections and 13 sub-sections containing essential information requested by the validating bodies. The readiness of the tests can be assessed by specific score limits for each sub-section. Results are displayed via a graphical representation to help identification of the sub-sections having sufficient or insufficient information. The relevance of the proposed innovative tool was supported using two test methods already validated by the OECD and four under development test methods.
    Keywords environment ; fish ; questionnaires ; reproductive system ; Endocrine disrupting chemicals ; Zebrafish embryo ; OBERON ; Pepper ; Validation process ; IATA ; OECD
    Language English
    Dates of publication 2023-04
    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.2023.107910
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  9. Article: Hypericum lanceolatum

    Gence, Laura / Fernezelian, Danielle / Bringart, Matthieu / Veeren, Bryan / Christophe, Armelle / Brion, François / Meilhac, Olivier / Bascands, Jean-Loup / Diotel, Nicolas

    Frontiers in pharmacology

    2022  Volume 13, Page(s) 832928

    Abstract: Hypericum ... ...

    Abstract Hypericum lanceolatum
    Language English
    Publishing date 2022-03-11
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2587355-6
    ISSN 1663-9812
    ISSN 1663-9812
    DOI 10.3389/fphar.2022.832928
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: A comparison of behavioral and reproductive parameters between wild-type, transgenic and mutant zebrafish: Could they all be considered the same "zebrafish" for reglementary assays on endocrine disruption?

    De Oliveira, Julie / Chadili, Edith / Turies, Cyril / Brion, François / Cousin, Xavier / Hinfray, Nathalie

    Comparative biochemistry and physiology. Toxicology & pharmacology : CBP

    2020  Volume 239, Page(s) 108879

    Abstract: Transgenic zebrafish models are efficiently used to study the effects of endocrine disrupting chemicals (EDC); thereby informing on their mechanisms of action. However, given the reported differences between zebrafish strains at the genetical, ... ...

    Abstract Transgenic zebrafish models are efficiently used to study the effects of endocrine disrupting chemicals (EDC); thereby informing on their mechanisms of action. However, given the reported differences between zebrafish strains at the genetical, physiological and behavioral levels; care should be taken before using these transgenic models for EDC testing. In the present study, we undertook a set of experiments in different transgenic and/or mutant zebrafish strains of interest for EDC testing: casper, cyp19a1a-eGFP, cyp19a1a-eGFP-casper, cyp11c1-eGFP, cyp11c1-eGFP-casper. Some behavioral traits, and some biochemical and reproductive physiological endpoints commonly used in EDC testing were assessed and compared to those obtained in WT AB zebrafish to ensure that transgene insertion and/or mutations do not negatively modify basal reproductive physiology or behavior of the fish. Behavioral traits considered as anxiety and sociality have been monitored. Sociality was evaluated by monitoring the time spent near congeners in a shuttle box while anxiety was evaluated using the Novel tank diving test. No critical difference was observed between strains for either sociality or anxiety level. Concerning reproduction, no significant difference in the number of eggs laid per female, in the viability of eggs or in the female circulating VTG concentrations was noted between the 5 transgenic/mutants and the WT AB zebrafish studied. In summary, the transgene insertion and the mutations had no influence on the endpoints measured in basal conditions. These results were a prerequisite to the use of these transgenic/mutant models for EDC testing. Next step will be to determine the sensitivity of these biological models to chemical exposure to accurately validate their use in existing fish assays for EDC testing.
    MeSH term(s) Animals ; Animals, Genetically Modified/physiology ; Animals, Wild/physiology ; Endocrine Disruptors/pharmacology ; Female ; Male ; Models, Animal ; Reproduction/drug effects ; Zebrafish/genetics ; Zebrafish/physiology
    Chemical Substances Endocrine Disruptors
    Language English
    Publishing date 2020-08-30
    Publishing country United States
    Document type Comparative Study ; Journal Article
    ZDB-ID 189285-x
    ISSN 1532-0456 ; 0306-4492 ; 0742-8413
    ISSN 1532-0456 ; 0306-4492 ; 0742-8413
    DOI 10.1016/j.cbpc.2020.108879
    Database MEDical Literature Analysis and Retrieval System OnLINE

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