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Titolo:
Regulation of plasma gonadotropin II secretion by sex steroids, aromatase inhibitors, and antiestrogens in the protandrous black porgy, Ancanthopagrus schlegeli Bleeker
Autore:
Lee, YH; Du, JL; Yen, FP; Lee, CY; Dufour, S; Huang, JD; Sun, LT; Chang, CF;
Indirizzi:
Natl Taiwan Ocean Univ, Dept Aquaculture, Keelung 202, Taiwan Natl Taiwan Ocean Univ Keelung Taiwan 202 uaculture, Keelung 202, Taiwan Museum Natl Hist Nat, CNRS, UMR 8572, Physiol Lab, Paris, France Museum Natl Hist Nat Paris France UMR 8572, Physiol Lab, Paris, France
Titolo Testata:
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY B-BIOCHEMISTRY & MOLECULAR BIOLOGY
fascicolo: 2-3, volume: 129, anno: 2001,
pagine: 399 - 406
SICI:
1096-4959(200106)129:2-3<399:ROPGIS>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
TROUT SALMO-GAIRDNERI; ACANTHOPAGRUS-SCHLEGELI; ATLANTIC SALMON; RAINBOW-TROUT; ONCORHYNCHUS-KISUTCH; ANGUILLA-ANGUILLA; FEEDBACK-CONTROL; COHO SALMON; MALE PARR; PITUITARY;
Keywords:
antiestrogen; aromatase inhibitors; black porgy; estradiol-17 beta; feedback control; fish; gonadotropin II; sex steroids;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Chang, CF Natl Taiwan Ocean Univ, Dept Aquaculture, Keelung 202, Taiwan Natl Taiwan Ocean Univ Keelung Taiwan 202 Keelung 202, Taiwan
Citazione:
Y.H. Lee et al., "Regulation of plasma gonadotropin II secretion by sex steroids, aromatase inhibitors, and antiestrogens in the protandrous black porgy, Ancanthopagrus schlegeli Bleeker", COMP BIOC B, 129(2-3), 2001, pp. 399-406

Abstract

Plasma gonadotropin II (GTH II) concentrations were significantly higher (approx. 15-20-fold) in estradiol-17 beta (E-2) treated (1.0 mug or 2.5 mug g(-1) body weight) female black porgy from days 4 to 12 compared with the control. E-2 (1 mug g-l wt.) had a stronger stimulation on plasma GTH II in early recrudescent phase (low GSI) males (11-fold) than in high GSI and late spermiating males (2.6-fold, P < 0.05). No effect of androgens (testosterone, T; Soc-dihydrotestosterone, DHT) on plasma GTH II levels was observed either sex. The levels of plasma GTH II were stimulated in 1,4,6-androstatriene-3,17-dione (ATD, 1 mug g(-1), 2 mug g(-1) body wt.) and fadrozole-treated (1 mug g(-1), 3 mug g(-1) body wt.) groups compared to control. Tamoxifen (1 mug g(-1), 3 mug g(-1) body wt.) but not enclomiphene could stimulatehigh GTH II levels in plasma. In another experiment of ATD in combination with T, T treatment further attenuated the ATD stimulation of plasma GTH IIlevels. We concluded that GTH II secretion is positively regulated by an estrogen-specific effect in female and male black porgy. Gonadal stage had significant effects on the responsiveness of GTH II to E, stimulation in males. A negative aromatase-dependent feedback control of plasma GTH II levelswas also suggested in the protandrous black porgy, Acanthopagrus schlegeli. (C) 2001 Published by Elsevier Science Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 11:21:49