The effect of chronic testosterone administration on sturgeon gonadotropins in juvenile and pre-vitellogenic white sturgeon (Acipenser transmontanus).
Identifieur interne : 000630 ( PubMed/Checkpoint ); précédent : 000629; suivant : 000631The effect of chronic testosterone administration on sturgeon gonadotropins in juvenile and pre-vitellogenic white sturgeon (Acipenser transmontanus).
Auteurs : R J Pavlick [États-Unis] ; G P MobergSource :
- General and comparative endocrinology [ 0016-6480 ] ; 1997.
English descriptors
- KwdEn :
- Animals, Cohort Studies, Drug Implants, Female, Fishes, Gonadotropin-Releasing Hormone (administration & dosage), Gonadotropin-Releasing Hormone (pharmacology), Gonadotropins, Pituitary (blood), Gonadotropins, Pituitary (metabolism), Injections, Intraperitoneal, Sexual Maturation, Testosterone (administration & dosage), Testosterone (blood), Testosterone (pharmacology), Time Factors.
- MESH :
- chemical , administration & dosage : Gonadotropin-Releasing Hormone, Testosterone.
- chemical , blood : Gonadotropins, Pituitary, Testosterone.
- chemical , metabolism : Gonadotropins, Pituitary.
- chemical , pharmacology : Gonadotropin-Releasing Hormone, Testosterone.
- chemical : Drug Implants.
- Animals, Cohort Studies, Female, Fishes, Injections, Intraperitoneal, Sexual Maturation, Time Factors.
Abstract
The effects of chronic exogenous testosterone treatment on the synthesis and/or secretion of two sturgeon gonadotropins (stGTH I and stGTH II) were assessed in 2-year-old juvenile white sturgeon (Acipenser transmontanus) surgically implanted with silastic capsules filled with 75 mg of testosterone and in previtellogenic female white sturgeon females implanted with 150 mg of testosterone. In groups of juvenile white sturgeon sacrificed 30, 60, 90, or 442 days postimplantation, pituitary concentrations of stGTH I were significantly greater in testosterone-treated fish (P < 0.01) when compared to those of controls. Pituitary concentrations of stGTH II were significantly higher (P < 0.01) in juvenile fish treated 60, 90, or 442 days with testosterone when compared to those of controls. Exogenous testosterone had no effect on plasma concentrations of either stGTH. Additional testosterone-treated juvenile sturgeon which were injected intraperitoneally 90 or 442 days postimplantation with 10 microg/kg of the gonadotropin releasing hormone analog d-Ala6-des-Gly10-GnRH ethylamide (GnRHa) also showed no change in plasma concentrations of stGTHs. Similar results were obtained for previtellogenic white sturgeon, as pituitary concentrations of stGTH I and stGTH II were significantly greater (P < 0.01) after 60 days of testosterone treatment compared to those of controls. A second group of 60-day testosterone-treated previtellogenic females also failed to exhibit increases of plasma stGTHs when administered 10 microg/kg of GnRHa. These results indicate that long-term testosterone treatment stimulates the accumulation of pituitary stGTHs in both juvenile and previtellogenic white sturgeon but does not affect basal or GnRHa-induced stGTH secretion.
DOI: 10.1006/gcen.1996.6823
PubMed: 9038254
Affiliations:
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pubmed:9038254Le document en format XML
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In groups of juvenile white sturgeon sacrificed 30, 60, 90, or 442 days postimplantation, pituitary concentrations of stGTH I were significantly greater in testosterone-treated fish (P < 0.01) when compared to those of controls. Pituitary concentrations of stGTH II were significantly higher (P < 0.01) in juvenile fish treated 60, 90, or 442 days with testosterone when compared to those of controls. Exogenous testosterone had no effect on plasma concentrations of either stGTH. Additional testosterone-treated juvenile sturgeon which were injected intraperitoneally 90 or 442 days postimplantation with 10 microg/kg of the gonadotropin releasing hormone analog d-Ala6-des-Gly10-GnRH ethylamide (GnRHa) also showed no change in plasma concentrations of stGTHs. Similar results were obtained for previtellogenic white sturgeon, as pituitary concentrations of stGTH I and stGTH II were significantly greater (P < 0.01) after 60 days of testosterone treatment compared to those of controls. A second group of 60-day testosterone-treated previtellogenic females also failed to exhibit increases of plasma stGTHs when administered 10 microg/kg of GnRHa. These results indicate that long-term testosterone treatment stimulates the accumulation of pituitary stGTHs in both juvenile and previtellogenic white sturgeon but does not affect basal or GnRHa-induced stGTH secretion.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">9038254</PMID><DateCreated><Year>1997</Year><Month>04</Month><Day>11</Day></DateCreated><DateCompleted><Year>1997</Year><Month>04</Month><Day>11</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>105</Volume><Issue>2</Issue><PubDate><Year>1997</Year><Month>Feb</Month></PubDate></JournalIssue><Title>General and comparative endocrinology</Title><ISOAbbreviation>Gen. Comp. Endocrinol.</ISOAbbreviation></Journal><ArticleTitle>The effect of chronic testosterone administration on sturgeon gonadotropins in juvenile and pre-vitellogenic white sturgeon (Acipenser transmontanus).</ArticleTitle><Pagination><MedlinePgn>218-27</MedlinePgn></Pagination><Abstract><AbstractText>The effects of chronic exogenous testosterone treatment on the synthesis and/or secretion of two sturgeon gonadotropins (stGTH I and stGTH II) were assessed in 2-year-old juvenile white sturgeon (Acipenser transmontanus) surgically implanted with silastic capsules filled with 75 mg of testosterone and in previtellogenic female white sturgeon females implanted with 150 mg of testosterone. In groups of juvenile white sturgeon sacrificed 30, 60, 90, or 442 days postimplantation, pituitary concentrations of stGTH I were significantly greater in testosterone-treated fish (P < 0.01) when compared to those of controls. Pituitary concentrations of stGTH II were significantly higher (P < 0.01) in juvenile fish treated 60, 90, or 442 days with testosterone when compared to those of controls. Exogenous testosterone had no effect on plasma concentrations of either stGTH. Additional testosterone-treated juvenile sturgeon which were injected intraperitoneally 90 or 442 days postimplantation with 10 microg/kg of the gonadotropin releasing hormone analog d-Ala6-des-Gly10-GnRH ethylamide (GnRHa) also showed no change in plasma concentrations of stGTHs. Similar results were obtained for previtellogenic white sturgeon, as pituitary concentrations of stGTH I and stGTH II were significantly greater (P < 0.01) after 60 days of testosterone treatment compared to those of controls. A second group of 60-day testosterone-treated previtellogenic females also failed to exhibit increases of plasma stGTHs when administered 10 microg/kg of GnRHa. 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