Thyroid of lake sturgeon, Acipenser fulvescens. I. Hormone levels in blood and tissues.
Identifieur interne : 000557 ( PubMed/Checkpoint ); précédent : 000556; suivant : 000558Thyroid of lake sturgeon, Acipenser fulvescens. I. Hormone levels in blood and tissues.
Auteurs : James C. Plohman [Canada] ; Terry A. Dick ; J Geoffrey EalesSource :
- General and comparative endocrinology [ 0016-6480 ] ; 2002.
English descriptors
- KwdEn :
- MESH :
- chemical , blood : Thyroid Hormones, Thyroxine, Triiodothyronine.
- metabolism : Erythrocytes, Fishes, Thyroid Gland, Thyroid Hormones, Thyroxine, Triiodothyronine.
- Animals, Female, Male, Radioimmunoassay.
Abstract
The authors measured thyroid hormone (TH) levels in plasma, whole carcass, and tissues of cultured 2-year-old immature lake sturgeon held in fresh water and in serum of adults at spawning time from the Winnipeg River. Circulating thyroxine (T4) and 3,5,3'-triiodothyronine (T3) levels were low (T4 approximately 0.3 ng/ml, T3 approximately 0.2 ng/ml) in all cultured fish and most adults, but a few of the latter had exceptionally high T4 and T3 levels. The percentages of blood TH found in erythrocytes were 19.5% (T4), 6.1% (T3) and 6.9% (reverse T3 = rT3). Equilibrium dialysis showed much higher percentages of plasma free (F) FT4 (1.1%), FT3 (0.4%), and FrT3 (3,3',5'-triiodothyronine = rT3, 3.0%) for sturgeon than for rainbow trout, indicating more limited TH binding to sturgeon plasma sites. However, concentrations of FT4 and FT3 were close to those reported for salmonids. T3 levels exceeded T4 levels in most extrathyroidal tissues of cultured sturgeon but in most cases were less than 0.1 ng/g and 10 to 100 times lower than reported for salmonids; only the whole brain T3 concentration (5.6 ng/g) approached that of salmonids. The digested thyroid contained 21.3 ng T3/g and 2.4 ng T4/g. The authors conclude that lake sturgeon have a low circulating reserve of bound TH but have FT4 and FT3 concentrations close to those of salmonids. The high thyroidal T3:T4 ratio and low tissue T4 levels suggest that, in contrast to teleosts studied to date, the thyroid may be a significant direct source of T3, the primary TH in sturgeon tissues. High serum T4 and T3 levels in some sturgeon at spawning time may suggest a thyroid role in reproduction.
DOI: 10.1006/gcen.2001.7733
PubMed: 11825034
Affiliations:
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Hormone levels in blood and tissues.</title><author><name sortKey="Plohman, James C" sort="Plohman, James C" uniqKey="Plohman J" first="James C" last="Plohman">James C. Plohman</name><affiliation wicri:level="4"><nlm:affiliation>Department of Zoology, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.</nlm:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Zoology, University of Manitoba, Winnipeg, Manitoba R3T 2N2</wicri:regionArea><orgName type="university">Université du Manitoba</orgName><placeName><settlement type="city">Winnipeg</settlement><region type="state">Manitoba</region></placeName></affiliation></author><author><name sortKey="Dick, Terry A" sort="Dick, Terry A" uniqKey="Dick T" first="Terry A" last="Dick">Terry A. Dick</name></author><author><name sortKey="Eales, J Geoffrey" sort="Eales, J Geoffrey" uniqKey="Eales J" first="J Geoffrey" last="Eales">J Geoffrey Eales</name></author></analytic><series><title level="j">General and comparative endocrinology</title><idno type="ISSN">0016-6480</idno><imprint><date when="2002" type="published">2002</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Animals</term><term>Erythrocytes (metabolism)</term><term>Female</term><term>Fishes (metabolism)</term><term>Male</term><term>Radioimmunoassay</term><term>Thyroid Gland (metabolism)</term><term>Thyroid Hormones (blood)</term><term>Thyroid Hormones (metabolism)</term><term>Thyroxine (blood)</term><term>Thyroxine (metabolism)</term><term>Triiodothyronine (blood)</term><term>Triiodothyronine (metabolism)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="blood" xml:lang="en"><term>Thyroid Hormones</term><term>Thyroxine</term><term>Triiodothyronine</term></keywords><keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Erythrocytes</term><term>Fishes</term><term>Thyroid Gland</term><term>Thyroid Hormones</term><term>Thyroxine</term><term>Triiodothyronine</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Animals</term><term>Female</term><term>Male</term><term>Radioimmunoassay</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The authors measured thyroid hormone (TH) levels in plasma, whole carcass, and tissues of cultured 2-year-old immature lake sturgeon held in fresh water and in serum of adults at spawning time from the Winnipeg River. Circulating thyroxine (T4) and 3,5,3'-triiodothyronine (T3) levels were low (T4 approximately 0.3 ng/ml, T3 approximately 0.2 ng/ml) in all cultured fish and most adults, but a few of the latter had exceptionally high T4 and T3 levels. The percentages of blood TH found in erythrocytes were 19.5% (T4), 6.1% (T3) and 6.9% (reverse T3 = rT3). Equilibrium dialysis showed much higher percentages of plasma free (F) FT4 (1.1%), FT3 (0.4%), and FrT3 (3,3',5'-triiodothyronine = rT3, 3.0%) for sturgeon than for rainbow trout, indicating more limited TH binding to sturgeon plasma sites. However, concentrations of FT4 and FT3 were close to those reported for salmonids. T3 levels exceeded T4 levels in most extrathyroidal tissues of cultured sturgeon but in most cases were less than 0.1 ng/g and 10 to 100 times lower than reported for salmonids; only the whole brain T3 concentration (5.6 ng/g) approached that of salmonids. The digested thyroid contained 21.3 ng T3/g and 2.4 ng T4/g. The authors conclude that lake sturgeon have a low circulating reserve of bound TH but have FT4 and FT3 concentrations close to those of salmonids. The high thyroidal T3:T4 ratio and low tissue T4 levels suggest that, in contrast to teleosts studied to date, the thyroid may be a significant direct source of T3, the primary TH in sturgeon tissues. High serum T4 and T3 levels in some sturgeon at spawning time may suggest a thyroid role in reproduction.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">11825034</PMID><DateCreated><Year>2002</Year><Month>02</Month><Day>04</Day></DateCreated><DateCompleted><Year>2002</Year><Month>04</Month><Day>26</Day></DateCompleted><DateRevised><Year>2013</Year><Month>11</Month><Day>21</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0016-6480</ISSN><JournalIssue CitedMedium="Print"><Volume>125</Volume><Issue>1</Issue><PubDate><Year>2002</Year><Month>Jan</Month></PubDate></JournalIssue><Title>General and comparative endocrinology</Title><ISOAbbreviation>Gen. Comp. Endocrinol.</ISOAbbreviation></Journal><ArticleTitle>Thyroid of lake sturgeon, Acipenser fulvescens. I. Hormone levels in blood and tissues.</ArticleTitle><Pagination><MedlinePgn>47-55</MedlinePgn></Pagination><Abstract><AbstractText>The authors measured thyroid hormone (TH) levels in plasma, whole carcass, and tissues of cultured 2-year-old immature lake sturgeon held in fresh water and in serum of adults at spawning time from the Winnipeg River. Circulating thyroxine (T4) and 3,5,3'-triiodothyronine (T3) levels were low (T4 approximately 0.3 ng/ml, T3 approximately 0.2 ng/ml) in all cultured fish and most adults, but a few of the latter had exceptionally high T4 and T3 levels. The percentages of blood TH found in erythrocytes were 19.5% (T4), 6.1% (T3) and 6.9% (reverse T3 = rT3). Equilibrium dialysis showed much higher percentages of plasma free (F) FT4 (1.1%), FT3 (0.4%), and FrT3 (3,3',5'-triiodothyronine = rT3, 3.0%) for sturgeon than for rainbow trout, indicating more limited TH binding to sturgeon plasma sites. However, concentrations of FT4 and FT3 were close to those reported for salmonids. T3 levels exceeded T4 levels in most extrathyroidal tissues of cultured sturgeon but in most cases were less than 0.1 ng/g and 10 to 100 times lower than reported for salmonids; only the whole brain T3 concentration (5.6 ng/g) approached that of salmonids. The digested thyroid contained 21.3 ng T3/g and 2.4 ng T4/g. The authors conclude that lake sturgeon have a low circulating reserve of bound TH but have FT4 and FT3 concentrations close to those of salmonids. The high thyroidal T3:T4 ratio and low tissue T4 levels suggest that, in contrast to teleosts studied to date, the thyroid may be a significant direct source of T3, the primary TH in sturgeon tissues. 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Dick</name><name sortKey="Eales, J Geoffrey" sort="Eales, J Geoffrey" uniqKey="Eales J" first="J Geoffrey" last="Eales">J Geoffrey Eales</name></noCountry><country name="Canada"><region name="Manitoba"><name sortKey="Plohman, James C" sort="Plohman, James C" uniqKey="Plohman J" first="James C" last="Plohman">James C. Plohman</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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