Binding affinities of hepatic nuclear estrogen receptors for phytoestrogens in rainbow trout (Oncorhynchus mykiss) and Siberian sturgeon (Acipenser baeri).
Identifieur interne : 000079 ( Ncbi/Merge ); précédent : 000078; suivant : 000080Binding affinities of hepatic nuclear estrogen receptors for phytoestrogens in rainbow trout (Oncorhynchus mykiss) and Siberian sturgeon (Acipenser baeri).
Auteurs : K. Latonnelle [France] ; A. Fostier ; Françoise Le Menn [France] ; C. Bennetau-PelisseroSource :
- General and comparative endocrinology [ 0016-6480 ] ; 2002.
English descriptors
- KwdEn :
- Animals, Binding, Competitive, Estradiol (metabolism), Estrogens, Non-Steroidal (metabolism), Female, Fishes (metabolism), Genistein (metabolism), Isoflavones (metabolism), Liver (metabolism), Oncorhynchus mykiss (metabolism), Phytoestrogens, Plant Preparations, Receptors, Cytoplasmic and Nuclear (metabolism), Receptors, Estrogen (metabolism), Vitellogenins (biosynthesis).
- MESH :
- chemical , biosynthesis : Vitellogenins.
- chemical , metabolism : Estradiol, Estrogens, Non-Steroidal, Genistein, Isoflavones, Receptors, Cytoplasmic and Nuclear, Receptors, Estrogen.
- metabolism : Fishes, Liver, Oncorhynchus mykiss.
- Animals, Binding, Competitive, Female, Phytoestrogens, Plant Preparations.
Abstract
Phytoestrogens are dietary estrogenic contaminants capable of inducing vitellogenin synthesis in rainbow trout and Siberian sturgeon. A competitive-binding assay on their hepatic estrogen receptors (ER) was performed to determine the relative affinity of phytoestrogens compared to estradiol (E(2)). Phytoestrogen concentrations used were 1000 times higher than for E(2), except for genistein and formononetin. For each compound, the competition with 50%-bound labelled E(2) (DC(50)) was considered in order to classify phytoestrogens according to their affinity for ER. The affinities are compared for each species. In rainbow trout, estradiol (DC(50): 7 nM)>formononetin (DC(50): 260 nM)>genistein (DC(50): 570 nM)>equol (DC(50): 5.3 microM)>daidzein (DC(50): 9 microM)>biochanin A (DC(50): 100 microM). In sturgeon, estradiol (DC(50): 5 nM)>genistein (DC(50): 220)>formononetin (DC(50): 1 microM)>equol>(DC(50): 8.3 microM)>daidzein>(DC(50): 80 microM)>biochanin A (DC(50): 100 microM). These results demonstrate that phytoestrogens, mimicking estradiol, can disturb the endocrine system by competing for ER. Also, the higher sensitivity to genistein observed in vivo in Siberian sturgeon (vitellogenin synthesis), compared to rainbow trout, is not due to a higher affinity of genistein for the hepatic ER. Thus, the metabolism of phytoestrogen could be species dependent and affect sensitivity.
PubMed: 12441116
Links toward previous steps (curation, corpus...)
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Links to Exploration step
pubmed:12441116Le document en format XML
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<author><name sortKey="Le Menn, F" sort="Le Menn, F" uniqKey="Le Menn F" first="F" last="Le Menn">Françoise Le Menn</name>
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<term>Binding, Competitive</term>
<term>Estradiol (metabolism)</term>
<term>Estrogens, Non-Steroidal (metabolism)</term>
<term>Female</term>
<term>Fishes (metabolism)</term>
<term>Genistein (metabolism)</term>
<term>Isoflavones (metabolism)</term>
<term>Liver (metabolism)</term>
<term>Oncorhynchus mykiss (metabolism)</term>
<term>Phytoestrogens</term>
<term>Plant Preparations</term>
<term>Receptors, Cytoplasmic and Nuclear (metabolism)</term>
<term>Receptors, Estrogen (metabolism)</term>
<term>Vitellogenins (biosynthesis)</term>
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<keywords scheme="MESH" type="chemical" qualifier="biosynthesis" xml:lang="en"><term>Vitellogenins</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Estradiol</term>
<term>Estrogens, Non-Steroidal</term>
<term>Genistein</term>
<term>Isoflavones</term>
<term>Receptors, Cytoplasmic and Nuclear</term>
<term>Receptors, Estrogen</term>
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<keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Fishes</term>
<term>Liver</term>
<term>Oncorhynchus mykiss</term>
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<term>Binding, Competitive</term>
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<front><div type="abstract" xml:lang="en">Phytoestrogens are dietary estrogenic contaminants capable of inducing vitellogenin synthesis in rainbow trout and Siberian sturgeon. A competitive-binding assay on their hepatic estrogen receptors (ER) was performed to determine the relative affinity of phytoestrogens compared to estradiol (E(2)). Phytoestrogen concentrations used were 1000 times higher than for E(2), except for genistein and formononetin. For each compound, the competition with 50%-bound labelled E(2) (DC(50)) was considered in order to classify phytoestrogens according to their affinity for ER. The affinities are compared for each species. In rainbow trout, estradiol (DC(50): 7 nM)>formononetin (DC(50): 260 nM)>genistein (DC(50): 570 nM)>equol (DC(50): 5.3 microM)>daidzein (DC(50): 9 microM)>biochanin A (DC(50): 100 microM). In sturgeon, estradiol (DC(50): 5 nM)>genistein (DC(50): 220)>formononetin (DC(50): 1 microM)>equol>(DC(50): 8.3 microM)>daidzein>(DC(50): 80 microM)>biochanin A (DC(50): 100 microM). These results demonstrate that phytoestrogens, mimicking estradiol, can disturb the endocrine system by competing for ER. Also, the higher sensitivity to genistein observed in vivo in Siberian sturgeon (vitellogenin synthesis), compared to rainbow trout, is not due to a higher affinity of genistein for the hepatic ER. Thus, the metabolism of phytoestrogen could be species dependent and affect sensitivity.</div>
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<Title>General and comparative endocrinology</Title>
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<ArticleTitle>Binding affinities of hepatic nuclear estrogen receptors for phytoestrogens in rainbow trout (Oncorhynchus mykiss) and Siberian sturgeon (Acipenser baeri).</ArticleTitle>
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<Abstract><AbstractText>Phytoestrogens are dietary estrogenic contaminants capable of inducing vitellogenin synthesis in rainbow trout and Siberian sturgeon. A competitive-binding assay on their hepatic estrogen receptors (ER) was performed to determine the relative affinity of phytoestrogens compared to estradiol (E(2)). Phytoestrogen concentrations used were 1000 times higher than for E(2), except for genistein and formononetin. For each compound, the competition with 50%-bound labelled E(2) (DC(50)) was considered in order to classify phytoestrogens according to their affinity for ER. The affinities are compared for each species. In rainbow trout, estradiol (DC(50): 7 nM)>formononetin (DC(50): 260 nM)>genistein (DC(50): 570 nM)>equol (DC(50): 5.3 microM)>daidzein (DC(50): 9 microM)>biochanin A (DC(50): 100 microM). In sturgeon, estradiol (DC(50): 5 nM)>genistein (DC(50): 220)>formononetin (DC(50): 1 microM)>equol>(DC(50): 8.3 microM)>daidzein>(DC(50): 80 microM)>biochanin A (DC(50): 100 microM). These results demonstrate that phytoestrogens, mimicking estradiol, can disturb the endocrine system by competing for ER. Also, the higher sensitivity to genistein observed in vivo in Siberian sturgeon (vitellogenin synthesis), compared to rainbow trout, is not due to a higher affinity of genistein for the hepatic ER. Thus, the metabolism of phytoestrogen could be species dependent and affect sensitivity.</AbstractText>
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