The role of the IGF-I system for vitellogenesis in maturing female sterlet, Acipenser ruthenus Linnaeus, 1758.
Identifieur interne : 000503 ( PubMed/Curation ); précédent : 000502; suivant : 000504The role of the IGF-I system for vitellogenesis in maturing female sterlet, Acipenser ruthenus Linnaeus, 1758.
Auteurs : S. Wuertz [Allemagne] ; A. Nitsche ; M. Jastroch ; J. Gessner ; M. Klingenspor ; F. Kirschbaum ; W. KloasSource :
- General and comparative endocrinology [ 0016-6480 ] ; 2007.
English descriptors
- KwdEn :
- Animals, Base Sequence, Female, Fishes (genetics), Fishes (physiology), Gene Expression Regulation, Insulin-Like Growth Factor I (genetics), Insulin-Like Growth Factor I (physiology), Molecular Sequence Data, Ovulation (physiology), RNA, Messenger (analysis), Receptor, IGF Type 1 (genetics), Receptor, IGF Type 1 (metabolism), Sequence Homology, Sexual Maturation (physiology), Species Specificity, Vitellogenesis (physiology).
- MESH :
- chemical , analysis : RNA, Messenger.
- chemical , genetics : Insulin-Like Growth Factor I, Receptor, IGF Type 1.
- genetics : Fishes.
- chemical , metabolism : Receptor, IGF Type 1.
- physiology : Fishes, Insulin-Like Growth Factor I, Ovulation, Sexual Maturation, Vitellogenesis.
- Animals, Base Sequence, Female, Gene Expression Regulation, Molecular Sequence Data, Sequence Homology, Species Specificity.
Abstract
Transition from previtellogeneic to vitellogenic oocyte growth is a critical phase for folliculogenesis in sturgeon and may often be postponed for several years. Recent findings on the involvement of insulin-like growth factor I (IGF-I) in cell differentiation processes of oocyte follicle and ovarian steroidogenesis of teleosts in vitro led to the hypothesis that paracrine IGF-I could function as a potential trigger in vivo. For the first time, IGF-I and its corresponding receptor (IGF-IR) were identified in a non-teleostean fish. Real-time PCR assays for IGF-I and IGF-IR mRNA were established, normalising mRNA expression of the target genes to beta-microglobulin (beta2m). We clearly show that expression of IGF-I in the gonad is a substantial source for IGF-I-mediated effects in follicles compared to liver, brain, muscle and adipose tissue. Among these tissues, IGF-IR mRNA was highest in the gonad. With regard to different cohorts of coexisting follicles, highest expression of IGF-I and IGF-IR were met in developing follicles, indicating that IGF-I functions as an intraovarian modulator of follicle faith. Comparing previtellogenic follicles in females that matured within two years with non-maturing females f the same age, revealed an increases of 2.3-fold for IGF-I and 2.8-fold for IGF-IR mRNA expression in maturing females. These findings implicate an important role of paracrine IGF-I in early vitellogenesis and identify it as candidate vitellogenesis inducing factor (VIF), determining the faith of the follicle.
DOI: 10.1016/j.ygcen.2006.07.005
PubMed: 16945369
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Gessner</name></author><author><name sortKey="Klingenspor, M" sort="Klingenspor, M" uniqKey="Klingenspor M" first="M" last="Klingenspor">M. Klingenspor</name></author><author><name sortKey="Kirschbaum, F" sort="Kirschbaum, F" uniqKey="Kirschbaum F" first="F" last="Kirschbaum">F. Kirschbaum</name></author><author><name sortKey="Kloas, W" sort="Kloas, W" uniqKey="Kloas W" first="W" last="Kloas">W. 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Kirschbaum</name></author><author><name sortKey="Kloas, W" sort="Kloas, W" uniqKey="Kloas W" first="W" last="Kloas">W. Kloas</name></author></analytic><series><title level="j">General and comparative endocrinology</title><idno type="ISSN">0016-6480</idno><imprint><date when="2007" type="published">2007</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Animals</term><term>Base Sequence</term><term>Female</term><term>Fishes (genetics)</term><term>Fishes (physiology)</term><term>Gene Expression Regulation</term><term>Insulin-Like Growth Factor I (genetics)</term><term>Insulin-Like Growth Factor I (physiology)</term><term>Molecular Sequence Data</term><term>Ovulation (physiology)</term><term>RNA, Messenger (analysis)</term><term>Receptor, IGF Type 1 (genetics)</term><term>Receptor, IGF Type 1 (metabolism)</term><term>Sequence Homology</term><term>Sexual Maturation (physiology)</term><term>Species Specificity</term><term>Vitellogenesis (physiology)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="analysis" xml:lang="en"><term>RNA, Messenger</term></keywords><keywords scheme="MESH" type="chemical" qualifier="genetics" xml:lang="en"><term>Insulin-Like Growth Factor I</term><term>Receptor, IGF Type 1</term></keywords><keywords scheme="MESH" qualifier="genetics" xml:lang="en"><term>Fishes</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Receptor, IGF Type 1</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Fishes</term><term>Insulin-Like Growth Factor I</term><term>Ovulation</term><term>Sexual Maturation</term><term>Vitellogenesis</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Animals</term><term>Base Sequence</term><term>Female</term><term>Gene Expression Regulation</term><term>Molecular Sequence Data</term><term>Sequence Homology</term><term>Species Specificity</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Transition from previtellogeneic to vitellogenic oocyte growth is a critical phase for folliculogenesis in sturgeon and may often be postponed for several years. Recent findings on the involvement of insulin-like growth factor I (IGF-I) in cell differentiation processes of oocyte follicle and ovarian steroidogenesis of teleosts in vitro led to the hypothesis that paracrine IGF-I could function as a potential trigger in vivo. For the first time, IGF-I and its corresponding receptor (IGF-IR) were identified in a non-teleostean fish. Real-time PCR assays for IGF-I and IGF-IR mRNA were established, normalising mRNA expression of the target genes to beta-microglobulin (beta2m). We clearly show that expression of IGF-I in the gonad is a substantial source for IGF-I-mediated effects in follicles compared to liver, brain, muscle and adipose tissue. Among these tissues, IGF-IR mRNA was highest in the gonad. With regard to different cohorts of coexisting follicles, highest expression of IGF-I and IGF-IR were met in developing follicles, indicating that IGF-I functions as an intraovarian modulator of follicle faith. Comparing previtellogenic follicles in females that matured within two years with non-maturing females f the same age, revealed an increases of 2.3-fold for IGF-I and 2.8-fold for IGF-IR mRNA expression in maturing females. These findings implicate an important role of paracrine IGF-I in early vitellogenesis and identify it as candidate vitellogenesis inducing factor (VIF), determining the faith of the follicle.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">16945369</PMID><DateCreated><Year>2006</Year><Month>12</Month><Day>12</Day></DateCreated><DateCompleted><Year>2007</Year><Month>02</Month><Day>15</Day></DateCompleted><DateRevised><Year>2009</Year><Month>11</Month><Day>19</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0016-6480</ISSN><JournalIssue CitedMedium="Print"><Volume>150</Volume><Issue>1</Issue><PubDate><Year>2007</Year><Month>Jan</Month><Day>01</Day></PubDate></JournalIssue><Title>General and comparative endocrinology</Title><ISOAbbreviation>Gen. Comp. Endocrinol.</ISOAbbreviation></Journal><ArticleTitle>The role of the IGF-I system for vitellogenesis in maturing female sterlet, Acipenser ruthenus Linnaeus, 1758.</ArticleTitle><Pagination><MedlinePgn>140-50</MedlinePgn></Pagination><Abstract><AbstractText>Transition from previtellogeneic to vitellogenic oocyte growth is a critical phase for folliculogenesis in sturgeon and may often be postponed for several years. Recent findings on the involvement of insulin-like growth factor I (IGF-I) in cell differentiation processes of oocyte follicle and ovarian steroidogenesis of teleosts in vitro led to the hypothesis that paracrine IGF-I could function as a potential trigger in vivo. For the first time, IGF-I and its corresponding receptor (IGF-IR) were identified in a non-teleostean fish. Real-time PCR assays for IGF-I and IGF-IR mRNA were established, normalising mRNA expression of the target genes to beta-microglobulin (beta2m). We clearly show that expression of IGF-I in the gonad is a substantial source for IGF-I-mediated effects in follicles compared to liver, brain, muscle and adipose tissue. Among these tissues, IGF-IR mRNA was highest in the gonad. With regard to different cohorts of coexisting follicles, highest expression of IGF-I and IGF-IR were met in developing follicles, indicating that IGF-I functions as an intraovarian modulator of follicle faith. Comparing previtellogenic follicles in females that matured within two years with non-maturing females f the same age, revealed an increases of 2.3-fold for IGF-I and 2.8-fold for IGF-IR mRNA expression in maturing females. 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ValidYN="Y"><LastName>Kirschbaum</LastName><ForeName>F</ForeName><Initials>F</Initials></Author><Author ValidYN="Y"><LastName>Kloas</LastName><ForeName>W</ForeName><Initials>W</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2006</Year><Month>09</Month><Day>01</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Gen Comp Endocrinol</MedlineTA><NlmUniqueID>0370735</NlmUniqueID><ISSNLinking>0016-6480</ISSNLinking></MedlineJournalInfo><ChemicalList><Chemical><RegistryNumber>0</RegistryNumber><NameOfSubstance UI="D012333">RNA, Messenger</NameOfSubstance></Chemical><Chemical><RegistryNumber>67763-96-6</RegistryNumber><NameOfSubstance UI="D007334">Insulin-Like Growth Factor 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