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Auteur (down) Sucre, E.; Charmantier-Daures, M.; Grousset, E.; Charmantier, G.; Cucchi-Mouillot, P.
Titre Early development of the digestive tract (pharynx and gut) in the embryos and pre-larvae of the European sea bass Dicentrarchus labrax Type Article scientifique
Année 2009 Publication Revue Abrégée J. Fish Biol.
Volume 75 Numéro 6 Pages 1302-1322
Mots-Clés Moronidae; arch; atlantic salmon; chloride cells; development; embryo; gill arches; gill slits; histology; medaka oryzias-latipes; ontogeny; oreochromis-niloticus; paralichthys-olivaceus embryos; rainbow-trout; respiratory development; urinary system; zebrafish
Résumé The European sea bass Dicentrarchus labrax is a marine teleost important in Mediterranean aquaculture. The development of the entire digestive tract of D. labrax, including the pharynx, was investigated from early embryonic development to day 5 post hatching (dph), when the mouth opens. The digestive tract is initialized at stage 12 somites independently from two distinct infoldings of the endodermal sheet. In the pharyngeal region, the anterior infolding forms the pharynx and the first gill slits at stage 25 somites. The other three gill arches and slits are formed between 1 and 5 dph. Posteriorly, in the gut tube region, a posterior infolding forms the foregut, midgut and hindgut. The anus opens before hatching, at stage 28 somites. Associated organs (liver, pancreas and gall bladder) are all discernable from 3 dph. Some aspects of the development of the two independent initial infoldings seem original compared with data in the literature. These results are discussed and compared with embryonic and post-embryonic development patterns in other teleosts.
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ISSN 0022-1112 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 543
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Auteur (down) Sadoul, B.; Augustine, S.; Zimmer, E.; Begout, M.-L.; Vijayan, M.M.
Titre Prediction of long-term variation in offspring metabolism due to BPA in eggs in rainbow trout using the DEB model Type Article scientifique
Année 2019 Publication Revue Abrégée J. Sea Res.
Volume 143 Numéro Pages 222-230
Mots-Clés acceleration; bisphenol-a bpa; energetics; energy budget model; exposure; fathead minnow; growth; oncorhynchus-mykiss; starvation; zebrafish
Résumé Bisphenol A (BPA) in eggs prior to fertilization was found to induce long-term metabolic disturbances in juvenile rainbow trout (Oncorhynchus mykiss). Here we describe these imprinting effects in a Dynamic Energy Budget (DEB) framework, which allows interpretation of the data in an energy allocation context. First, DEB parameters for control rainbow trout were optimized using data extracted from 12 studies in the literature. Several modes of action on DEB parameters were then tested in order to correctly predict weight differences observed in rainbow trout in response to 5 different concentrations of BPA in eggs prior to fertilization. Reduced energy conductance (v) over dot at day 0, followed by an exponential recovery, was found to closely fit the experimental data. Effects on (v) over dot lasted beyond the disappearance of the chemical from the body, suggesting an imprinting effect of BPA on energy mobilization from the reserve. Our model predicts that early changes in DEB parameters lead to permanent and irreversible impairment of the metabolic growth acceleration in rainbow trout.
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ISSN 1385-1101 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2473
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Auteur (down) Sadoul, B.; Alfonso, S.; Bessa, E.; Bouchareb, A.; Blondeau-Bidet, E.; Clair, P.; Chatain, B.; Begout, M.L.; Geffroy, B.
Titre Enhanced brain expression of genes related to cell proliferation and neural differentiation is associated with cortisol receptor expression in fishes Type Article scientifique
Année 2018 Publication Revue Abrégée Gen. Comp. Endocrinol.
Volume 267 Numéro Pages 76-81
Mots-Clés behavior; dehydrogenase; european sea bass; Glucocorticoid receptor; glucocorticoid-receptor; Hypothalamo-pituitary-interrenal axis; Mineralocorticoid receptor; neurogenesis; Neurogenesis; plasticity; rainbow-trout; real-time pcr; stress; Stress; zebrafish
Résumé Stress enhances or inhibits neurogenesis in mammals and some fish species. The link between the two processes is still unclear. Most studies have been performed in very specific stressful or altered environments. Despite the known inter-individual divergence in coping abilities within populations, the relationship between the stress axis and neurogenesis has never been addressed in unstressed individuals. Here we correlate brain expression of the pcna (proliferating cell nuclear antigen) and neurod1 (neurogenic differentiation factor 1) genes, two markers of neurogenesis, with transcripts of cortisol receptors in three fish species living in very distinct environments. Within the three species, individuals with the highest expression of neurogenesis genes were also those that expressed the high levels of cortisol receptors. Based on these correlations and the hypothesis that mRNA levels are proxies of protein levels, we hypothesize that within unstressed animals, individuals sensitive to cortisol perceive a similar environment to be more stimulating, leading to increased neurogenesis. Although it is difficult to determine whether it is sensitivity to cortisol that affects neurogenesis capacities or the opposite, the proposed pathway is a potentially fruitful avenue that warrants further mechanistic experiments.
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Volume de collection Numéro de collection Edition
ISSN 0016-6480 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2416
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Auteur (down) Paiola, M.; Knigge, T.; Duflot, A.; Pinto, P.I.S.; Farcy, E.; Monsinjon, T.
Titre Oestrogen, an evolutionary conserved regulator of T cell differentiation and immune tolerance in jawed vertebrates? Type Article scientifique
Année 2018 Publication Revue Abrégée Dev. Comp. Immunol.
Volume 84 Numéro Pages 48-61
Mots-Clés bass dicentrarchus-labrax; danio-rerio; dendritic cells; estradiol; european sea-bass; Gamma-delta T cell; gene-expression; Head-kidney; receptor modulators; Regulatory T cell; reproductive-cycle; Spleen; Teleost; thymic epithelial-cells; Thymus; zebrafish
Résumé In teleosts, as in mammals, the immune system is tightly regulated by sexual steroid hormones, such as oestrogens. We investigated the effects of 17 beta-oestradiol on the expression of several genes related to T cell development and resulting T cell subpopulations in sea bass, Dicentrarchus labrax, for a primary lymphoid organ, the thymus, and two secondary lymphoid organs, the head-kidney and the spleen. In parallel, the oxidative burst capacity was assessed in leucocytes of the secondary lymphoid organs. Apoptosis- and proliferation-related genes, indicative of B and T cell clonal selection and lymphoid progenitor activity, were not affected by elevated oestrogen-levels. Sex-related oestrogen-responsiveness in T cell and antigen-presenting cell markers was observed, the expression of which was differentially induced by oestrogen-exposure in the three lymphoid organs. Remarkably, in the spleen, oestrogen increased regulatory T cell-related gene expression was associated with a decrease in oxidative burst capacity. To the best of our knowledge, this study indicates for the first time that physiological levels of oestrogen are likely to promote immune tolerance by modulating thymic function (i.e., T cell development and output) and peripheral T cells in teleosts, similar to previously reported oestrogenic effects in mammals. (C) 2018 Elsevier Ltd. All rights reserved.
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Éditeur de collection Titre de collection Titre de collection Abrégé
Volume de collection Numéro de collection Edition
ISSN 0145-305x ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2340
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Auteur (down) McKenzie, D.J.; Belao, T.C.; Killen, S.S.; Rantin, F.T.
Titre To boldly gulp: standard metabolic rate and boldness have context-dependent influences on risk-taking to breathe air in a catfish Type Article scientifique
Année 2015 Publication Revue Abrégée J. Exp. Biol.
Volume 218 Numéro 23 Pages 3762-3770
Mots-Clés african catfish; animal personality; Bimodal respiration; clarias-gariepinus; ecological consequences; Energy metabolism; european sea bass; Hypoxia; individual variation; oncorhynchus-mykiss; Personality; personality-traits; predation risk; Respiratory partitioning; Risk-taking; wild-type zebrafish
Résumé The African sharptooth catfish Clarias gariepinus has bimodal respiration, it has a suprabranchial air-breathing organ alongside substantial gills. We used automated bimodal respirometry to reveal that undisturbed juvenile catfish (N=29) breathed air continuously in normoxia, with a marked diurnal cycle. Air breathing and routine metabolic rate (RMR) increased in darkness when, in the wild, this nocturnal predator forages. Aquatic hypoxia (20% air saturation) greatly increased overall reliance on air breathing. We investigated whether two measures of risk taking to breathe air, namely absolute rates of aerial O-2 uptake ((M) over dotO(2), air) and the percentage of RMR obtained from air (% (M) over dotO(2), air), were influenced by individual standard metabolic rate (SMR) and boldness. In particular, whether any influence varied with resource availability (normoxia versus hypoxia) or relative fear of predation (day versus night). Individual SMR, derived from respirometry, had an overall positive influence on (M) over dotO(2), air across all contexts but a positive influence on % (M) over dotO(2), air only in hypoxia. Thus, a pervasive effect of SMR on air breathing became most acute in hypoxia, when individuals with higher O-2 demand took proportionally more risks. Boldness was estimated as time required to resume air breathing after a fearful stimulus in daylight normoxia (T-res). Although T-res had no overall influence on (M) over dotO(2), air or % (M) over dotO(2), air, there was a negative relationship between Tres and % (M) over dotO(2), air in daylight, in normoxia and hypoxia. There were two Tres response groups, 'bold' phenotypes with Tres below 75 min (N= 13) which, in daylight, breathed proportionally more air than 'shy' phenotypes with Tres above 115 min (N= 16). Therefore, individual boldness influenced air breathing when fear of predation was high. Thus, individual energy demand and personality did not have parallel influences on the emergent tendency to take risks to obtain a resource; their influences varied in strength with context.
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ISSN 0022-0949 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 1429
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