Evidence for differential photic regulation of pineal melatonin synthesis in teleosts
Identifieur interne : 001275 ( Istex/Corpus ); précédent : 001274; suivant : 001276Evidence for differential photic regulation of pineal melatonin synthesis in teleosts
Auteurs : H. Migaud ; A. Davie ; C. C. Martinez Chavez ; S. Al-KhameesSource :
- Journal of Pineal Research [ 0742-3098 ] ; 2007-11.
English descriptors
- KwdEn :
Abstract
Abstract: The aim of this study was to compare the circadian control of melatonin production in teleosts. To do so, the effects of ophthalmectomy on circulating melatonin rhythms were studied along with ex vivo pineal culture in six different teleosts. Results strongly suggested that the circadian control of melatonin production could have dramatically changed with at least three different systems being present in teleosts when one considers the photic regulation of pineal melatonin production. First, salmonids presented a decentralized system in which the pineal gland responds directly to light independently of the eyes. Then, in seabass and cod both the eyes and the pineal gland are required to sustain full night‐time melatonin production. Finally, a third type of circadian control of melatonin production is proposed in tilapia and catfish in which the pineal gland would not be light sensitive (or only slightly) and required the eyes to perceive light and inhibit melatonin synthesis. Further studies (anatomical, ultrastructural, retinal projections) are needed to confirm these results. Ex vivo experiments indirectly confirmed these results, as while the pineal gland responded normally to day–night rhythms in salmonids, seabass and cod, only very low levels were obtained at night in tilapia and no melatonin could be measured from isolated pineal glands in catfish. Together, these findings suggest that mechanisms involved in the perception of light and the transduction of this signal through the circadian axis has changed in teleosts possibly as a reflection of the photic environment in which they have evolved in.
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DOI: 10.1111/j.1600-079X.2007.00480.x
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ISTEX:65675BBDFC21B22B0B89121977C20F85F1EF4348Le document en format XML
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Migaud</name><affiliation><mods:affiliation>Reproduction and Genetics Group, Institute of Aquaculture, University of Stirling, Stirling, UK</mods:affiliation></affiliation></author><author><name sortKey="Davie, A" sort="Davie, A" uniqKey="Davie A" first="A." last="Davie">A. Davie</name><affiliation><mods:affiliation>Reproduction and Genetics Group, Institute of Aquaculture, University of Stirling, Stirling, UK</mods:affiliation></affiliation></author><author><name sortKey="Martinez Chavez, C C" sort="Martinez Chavez, C C" uniqKey="Martinez Chavez C" first="C. C." last="Martinez Chavez">C. C. Martinez Chavez</name><affiliation><mods:affiliation>Reproduction and Genetics Group, Institute of Aquaculture, University of Stirling, Stirling, UK</mods:affiliation></affiliation></author><author><name sortKey="Al Hamees, S" sort="Al Hamees, S" uniqKey="Al Hamees S" first="S." last="Al-Khamees">S. 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To do so, the effects of ophthalmectomy on circulating melatonin rhythms were studied along with ex vivo pineal culture in six different teleosts. Results strongly suggested that the circadian control of melatonin production could have dramatically changed with at least three different systems being present in teleosts when one considers the photic regulation of pineal melatonin production. First, salmonids presented a decentralized system in which the pineal gland responds directly to light independently of the eyes. Then, in seabass and cod both the eyes and the pineal gland are required to sustain full night‐time melatonin production. Finally, a third type of circadian control of melatonin production is proposed in tilapia and catfish in which the pineal gland would not be light sensitive (or only slightly) and required the eyes to perceive light and inhibit melatonin synthesis. Further studies (anatomical, ultrastructural, retinal projections) are needed to confirm these results. Ex vivo experiments indirectly confirmed these results, as while the pineal gland responded normally to day–night rhythms in salmonids, seabass and cod, only very low levels were obtained at night in tilapia and no melatonin could be measured from isolated pineal glands in catfish. Together, these findings suggest that mechanisms involved in the perception of light and the transduction of this signal through the circadian axis has changed in teleosts possibly as a reflection of the photic environment in which they have evolved in.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>H. Migaud</name><affiliations><json:string>Reproduction and Genetics Group, Institute of Aquaculture, University of Stirling, Stirling, UK</json:string></affiliations></json:item><json:item><name>A. Davie</name><affiliations><json:string>Reproduction and Genetics Group, Institute of Aquaculture, University of Stirling, Stirling, UK</json:string></affiliations></json:item><json:item><name>C. C. Martinez Chavez</name><affiliations><json:string>Reproduction and Genetics Group, Institute of Aquaculture, University of Stirling, Stirling, UK</json:string></affiliations></json:item><json:item><name>S. 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Ex vivo experiments indirectly confirmed these results, as while the pineal gland responded normally to day–night rhythms in salmonids, seabass and cod, only very low levels were obtained at night in tilapia and no melatonin could be measured from isolated pineal glands in catfish. Together, these findings suggest that mechanisms involved in the perception of light and the transduction of this signal through the circadian axis has changed in teleosts possibly as a reflection of the photic environment in which they have evolved in.</p></abstract><textClass xml:lang="en"><keywords scheme="keyword"><list><head>keywords</head><item><term>circadian axis</term></item><item><term>melatonin</term></item><item><term>ophthalmectomy</term></item><item><term>pineal gland</term></item><item><term>teleosts</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2007-11">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/65675BBDFC21B22B0B89121977C20F85F1EF4348/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component version="2.0" type="serialArticle" xml:lang="en"><header><publicationMeta level="product"><publisherInfo><publisherName>Blackwell Publishing Ltd</publisherName><publisherLoc>Oxford, UK</publisherLoc></publisherInfo><doi origin="wiley" registered="yes">10.1111/(ISSN)1600-079X</doi><issn type="print">0742-3098</issn><issn type="electronic">1600-079X</issn><idGroup><id type="product" value="JPI"></id><id type="publisherDivision" value="ST"></id></idGroup><titleGroup><title type="main" sort="JOURNAL OF PINEAL RESEARCH">Journal of Pineal Research</title></titleGroup></publicationMeta><publicationMeta level="part" position="11004"><doi origin="wiley">10.1111/jpi.2007.43.issue-4</doi><numberingGroup><numbering type="journalVolume" number="43">43</numbering><numbering type="journalIssue" number="4">4</numbering></numberingGroup><coverDate startDate="2007-11">November 2007</coverDate></publicationMeta><publicationMeta level="unit" type="article" position="3" status="forIssue"><doi origin="wiley">10.1111/j.1600-079X.2007.00480.x</doi><idGroup><id type="unit" value="JPI480"></id></idGroup><countGroup><count type="pageTotal" number="9"></count></countGroup><titleGroup><title type="tocHeading1">Original Articles</title></titleGroup><eventGroup><event type="firstOnline" date="2007-08-16"></event><event type="publishedOnlineFinalForm" date="2007-08-16"></event><event type="xmlConverted" agent="Converter:BPG_TO_WML3G version:2.3.2 mode:FullText source:FullText result:FullText" date="2010-03-16"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:3.8.8" date="2014-02-01"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.1.7 mode:FullText,remove_FC" date="2014-10-30"></event></eventGroup><numberingGroup><numbering type="pageFirst" number="327">327</numbering><numbering type="pageLast" number="335">335</numbering></numberingGroup><correspondenceTo>Address reprint requests to Herve Migaud, Institute of Aquaculture, University of Stirling, FK9 4LA, Stirling, UK.
E‐mail: <email>herve.migaud@stir.ac.uk</email></correspondenceTo><linkGroup><link type="toTypesetVersion" href="file:JPI.JPI480.pdf"></link></linkGroup></publicationMeta><contentMeta><unparsedEditorialHistory>Received April 25, 2007; accepted June 28, 2007.</unparsedEditorialHistory><countGroup><count type="figureTotal" number="4"></count><count type="tableTotal" number="2"></count></countGroup><titleGroup><title type="main">Evidence for differential photic regulation of pineal melatonin synthesis in teleosts</title><title type="shortAuthors"><i>Migaud et al.</i></title><title type="short"><i>Photic regulation of pineal melatonin in teleosts</i></title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#aff-1-1"><personName><givenNames>H.</givenNames><familyName>Migaud</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#aff-1-1"><personName><givenNames>A.</givenNames><familyName>Davie</familyName></personName></creator><creator creatorRole="author" xml:id="cr3" affiliationRef="#aff-1-1"><personName><givenNames> C. C.</givenNames><familyName>Martinez Chavez</familyName></personName></creator><creator creatorRole="author" xml:id="cr4" affiliationRef="#aff-1-1"><personName><givenNames> S.</givenNames><familyName>Al‐Khamees</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="aff-1-1" countryCode="GB"><unparsedAffiliation>Reproduction and Genetics Group, Institute of Aquaculture, University of Stirling, Stirling, UK</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup xml:lang="en"><keyword xml:id="k1">circadian axis</keyword><keyword xml:id="k2">melatonin</keyword><keyword xml:id="k3">ophthalmectomy</keyword><keyword xml:id="k4">pineal gland</keyword><keyword xml:id="k5">teleosts</keyword></keywordGroup><abstractGroup><abstract type="main" xml:lang="en"><p><b>Abstract: </b> The aim of this study was to compare the circadian control of melatonin production in teleosts. To do so, the effects of ophthalmectomy on circulating melatonin rhythms were studied along with ex vivo pineal culture in six different teleosts. Results strongly suggested that the circadian control of melatonin production could have dramatically changed with at least three different systems being present in teleosts when one considers the photic regulation of pineal melatonin production. First, salmonids presented a decentralized system in which the pineal gland responds directly to light independently of the eyes. Then, in seabass and cod both the eyes and the pineal gland are required to sustain full night‐time melatonin production. Finally, a third type of circadian control of melatonin production is proposed in tilapia and catfish in which the pineal gland would not be light sensitive (or only slightly) and required the eyes to perceive light and inhibit melatonin synthesis. Further studies (anatomical, ultrastructural, retinal projections) are needed to confirm these results. Ex vivo experiments indirectly confirmed these results, as while the pineal gland responded normally to day–night rhythms in salmonids, seabass and cod, only very low levels were obtained at night in tilapia and no melatonin could be measured from isolated pineal glands in catfish. Together, these findings suggest that mechanisms involved in the perception of light and the transduction of this signal through the circadian axis has changed in teleosts possibly as a reflection of the photic environment in which they have evolved in.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Evidence for differential photic regulation of pineal melatonin synthesis in teleosts</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>Photic regulation of pineal melatonin in teleosts</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Evidence for differential photic regulation of pineal melatonin synthesis in teleosts</title></titleInfo><name type="personal"><namePart type="given">H.</namePart><namePart type="family">Migaud</namePart><affiliation>Reproduction and Genetics Group, Institute of Aquaculture, University of Stirling, Stirling, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">A.</namePart><namePart type="family">Davie</namePart><affiliation>Reproduction and Genetics Group, Institute of Aquaculture, University of Stirling, Stirling, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">C. C.</namePart><namePart type="family">Martinez Chavez</namePart><affiliation>Reproduction and Genetics Group, Institute of Aquaculture, University of Stirling, Stirling, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">S.</namePart><namePart type="family">Al‐Khamees</namePart><affiliation>Reproduction and Genetics Group, Institute of Aquaculture, University of Stirling, Stirling, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><place><placeTerm type="text">Oxford, UK</placeTerm></place><dateIssued encoding="w3cdtf">2007-11</dateIssued><edition>Received April 25, 2007; accepted June 28, 2007.</edition><copyrightDate encoding="w3cdtf">2007</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">4</extent><extent unit="tables">2</extent></physicalDescription><abstract>Abstract: The aim of this study was to compare the circadian control of melatonin production in teleosts. To do so, the effects of ophthalmectomy on circulating melatonin rhythms were studied along with ex vivo pineal culture in six different teleosts. Results strongly suggested that the circadian control of melatonin production could have dramatically changed with at least three different systems being present in teleosts when one considers the photic regulation of pineal melatonin production. First, salmonids presented a decentralized system in which the pineal gland responds directly to light independently of the eyes. Then, in seabass and cod both the eyes and the pineal gland are required to sustain full night‐time melatonin production. Finally, a third type of circadian control of melatonin production is proposed in tilapia and catfish in which the pineal gland would not be light sensitive (or only slightly) and required the eyes to perceive light and inhibit melatonin synthesis. Further studies (anatomical, ultrastructural, retinal projections) are needed to confirm these results. Ex vivo experiments indirectly confirmed these results, as while the pineal gland responded normally to day–night rhythms in salmonids, seabass and cod, only very low levels were obtained at night in tilapia and no melatonin could be measured from isolated pineal glands in catfish. Together, these findings suggest that mechanisms involved in the perception of light and the transduction of this signal through the circadian axis has changed in teleosts possibly as a reflection of the photic environment in which they have evolved in.</abstract><subject lang="en"><genre>keywords</genre><topic>circadian axis</topic><topic>melatonin</topic><topic>ophthalmectomy</topic><topic>pineal gland</topic><topic>teleosts</topic></subject><relatedItem type="host"><titleInfo><title>Journal of Pineal Research</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">0742-3098</identifier><identifier type="eISSN">1600-079X</identifier><identifier type="DOI">10.1111/(ISSN)1600-079X</identifier><identifier type="PublisherID">JPI</identifier><part><date>2007</date><detail type="volume"><caption>vol.</caption><number>43</number></detail><detail type="issue"><caption>no.</caption><number>4</number></detail><extent unit="pages"><start>327</start><end>335</end><total>9</total></extent></part></relatedItem><identifier type="istex">65675BBDFC21B22B0B89121977C20F85F1EF4348</identifier><identifier type="DOI">10.1111/j.1600-079X.2007.00480.x</identifier><identifier type="ArticleID">JPI480</identifier><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>Blackwell Publishing Ltd</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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|texte= Evidence for differential photic regulation of pineal melatonin synthesis in teleosts
}}
| This area was generated with Dilib version V0.6.27. |  |