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Titolo:
Sex steroids in plasma of lake whitefish Coregonus clupeaformis during spawning in Lake Erie
Autore:
Rinchard, J; Dabrowski, K; Ottobre, J;
Indirizzi:
Ohio State Univ, Sch Nat Resources, Columbus, OH 43210 USA Ohio State Univ Columbus OH USA 43210 t Resources, Columbus, OH 43210 USA Ohio State Univ, Dept Anim Sci, Columbus, OH 43210 USA Ohio State Univ Columbus OH USA 43210 pt Anim Sci, Columbus, OH 43210 USA
Titolo Testata:
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-TOXICOLOGY & PHARMACOLOGY
fascicolo: 1, volume: 129, anno: 2001,
pagine: 65 - 74
SICI:
1532-0456(200105)129:1<65:SSIPOL>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
OOCYTE FINAL MATURATION; TROUT SALMO-GAIRDNERI; FEMALE RAINBOW-TROUT; 17-ALPHA,20-BETA-DIHYDROXY-4-PREGNEN-3-ONE 20-SULFATE; CHORIONIC-GONADOTROPIN; ONCORHYNCHUS-MYKISS; OVARIAN FOLLICLES; GONADAL-STEROIDS; HORMONE CHANGES; MILL EFFLUENT;
Keywords:
lake whitefish; Coregonus clupeaformis; reproduction; sex steroids; ovulation; spermiation; testosterone; estradiol-17 beta, 17,20 beta-dihydroxy-4-pregnen-3-one;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Rinchard, J Ohio State Univ, Sch Nat Resources, 2021 Coffey Rd, Columbus, OH 43210 USA Ohio State Univ 2021 Coffey Rd Columbus OH USA 43210 43210 USA
Citazione:
J. Rinchard et al., "Sex steroids in plasma of lake whitefish Coregonus clupeaformis during spawning in Lake Erie", COMP BIOC C, 129(1), 2001, pp. 65-74

Abstract

Lake whitefish, Coregonus clupeaformis, were collected from the Western basin of Lake Erie during spawning. Free and conjugated (sulfated and glucuronidated) steroids including testosterone (T), 11-ketotestosterone (11-kT), estradiol-17 beta (E2) and 17,20 beta -dihydroxy-4-pregnen-3-one (17,20 betaP) were measured in the plasma by radioimmunoassay. In males, the progression of spermiation was characterized by a significant decrease in plasma free steroids, whereas the levels of conjugated steroids remained similar andlow, except for sulfated and glucuronidated testosterone. Plasma sex steroids did not correlate with the density or the motility of the spermatozoa. In females, the concentration of plasma T was significantly higher in preovulating than in ovulating females. The levels of E2 and 17,20 betaP in ovulating lake whitefish exhibited large variations ranging from below detection limit to 0.9 ng ml(-1) and from 0.2 to 13 ng ml(-1), respectively. Analysis of conjugated steroids revealed high levels of glucuronidated and sulfated 17,20 betaP and glucuronidated T in females ovulating in December. However, no significant differences in the proportion of the conjugated steroidswere observed. (C) 2001 Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 09:44:10