Homologous growth hormone (GH) binding in gilthead sea bream (Sparus aurata). Effect of fasting and refeeding on hepatic GH‐binding and plasma somatomedin‐like immunoreactivity
Identifieur interne : 001C50 ( Main/Merge ); précédent : 001C49; suivant : 001C51Homologous growth hormone (GH) binding in gilthead sea bream (Sparus aurata). Effect of fasting and refeeding on hepatic GH‐binding and plasma somatomedin‐like immunoreactivity
Auteurs : J. Pérez-Sánchez [Espagne] ; H. Martí-Palanca [Espagne] ; P-Y. Le Bail [France]Source :
- Journal of Fish Biology [ 0022-1112 ] ; 1994-02.
English descriptors
Abstract
Specific binding of gilthead sea bream growth hormone (sbGH) to liver membrane preparations was a time and temperature dependent process, and was saturable by increasing amounts of membrane proteins. Scatchard analysis evidenced a single class of high‐affinity and lowcapacity binding sites. Ovine prolactin, recombinant tilapia prolactin, carp gonadotropin and chinook salmon gonadotropin did not compete for the125I‐sbGH binding sites, while recombinant trout GH, bovine GH and human GH displaced iodinated sbGH in a dose dependent‐manner. IGF‐I‐like immunoreactivity was detected after acidification of plasma and removal of IGF‐I binding activity. A parallel displacement to the rhIGF‐1 standard was observed with extracted plasma samples. Free and total hepatic GH‐binding decreased during long‐term starvation (3–9 weeks), returning to control values during the refeeding period. Plasma IGF‐I‐like immunoreactivity showed a similar trend. To our knowledge, this is the first report that indicates a coordinated regulation of GH‐binding and plasma somatomedin‐like activity in a typical marine fish.
Url:
DOI: 10.1111/j.1095-8649.1994.tb01206.x
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Effect of fasting and refeeding on hepatic GH‐binding and plasma somatomedin‐like immunoreactivity</title><author><name sortKey="Perez Nchez, J" sort="Perez Nchez, J" uniqKey="Perez Nchez J" first="J." last="Pérez-Sánchez">J. Pérez-Sánchez</name><affiliation wicri:level="1"><country xml:lang="fr">Espagne</country><wicri:regionArea>Instituto de Acuicultura de Torre de la Sal, CSIC, 12595 Torre de la Sal, Ribera de Cabanes, Castellon</wicri:regionArea><wicri:noRegion>Castellon</wicri:noRegion></affiliation></author><author><name sortKey="Marti Alanca, H" sort="Marti Alanca, H" uniqKey="Marti Alanca H" first="H." last="Martí-Palanca">H. 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Le Bail</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Laboraloire de Physiologie des Poissons, INRA, Campus de Beaulieu, 35042 Rennes Cedex</wicri:regionArea><placeName><region type="region" nuts="2">Région Bretagne</region><settlement type="city">Rennes</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Fish Biology</title><idno type="ISSN">0022-1112</idno><idno type="eISSN">1095-8649</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="1994-02">1994-02</date><biblScope unit="volume">44</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="287">287</biblScope><biblScope unit="page" to="301">301</biblScope></imprint><idno type="ISSN">0022-1112</idno></series><idno type="istex">D24010D1D4B60C96BE9634F234664AC71BB4AD1A</idno><idno type="DOI">10.1111/j.1095-8649.1994.tb01206.x</idno><idno type="ArticleID">JFB287</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-1112</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>fasting</term><term>gilthead sea bream</term><term>growth hormone</term><term>insulin‐like growth factors</term><term>teleost</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Specific binding of gilthead sea bream growth hormone (sbGH) to liver membrane preparations was a time and temperature dependent process, and was saturable by increasing amounts of membrane proteins. Scatchard analysis evidenced a single class of high‐affinity and lowcapacity binding sites. Ovine prolactin, recombinant tilapia prolactin, carp gonadotropin and chinook salmon gonadotropin did not compete for the125I‐sbGH binding sites, while recombinant trout GH, bovine GH and human GH displaced iodinated sbGH in a dose dependent‐manner. IGF‐I‐like immunoreactivity was detected after acidification of plasma and removal of IGF‐I binding activity. A parallel displacement to the rhIGF‐1 standard was observed with extracted plasma samples. Free and total hepatic GH‐binding decreased during long‐term starvation (3–9 weeks), returning to control values during the refeeding period. Plasma IGF‐I‐like immunoreactivity showed a similar trend. To our knowledge, this is the first report that indicates a coordinated regulation of GH‐binding and plasma somatomedin‐like activity in a typical marine fish.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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