Preovulatory changes in the levels of three gonadotropin-releasing hormone-encoding messenger ribonucleic acids (mRNAs), gonadotropin beta- subunit mRNAs, plasma gonadotropin, and steroids in the female gilthead seabream, Sparus aurata

Y Gothilf; I Meiri; Abigail Elizur; Y Zohar

doi:10.1095/biolreprod57.5.1145

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Preovulatory changes in the levels of three gonadotropin-releasing hormone-encoding messenger ribonucleic acids (mRNAs), gonadotropin beta- subunit mRNAs, plasma gonadotropin, and steroids in the female gilthead seabream, Sparus aurata

Journal article

Peer reviewed

Preovulatory changes in the levels of three gonadotropin-releasing hormone-encoding messenger ribonucleic acids (mRNAs), gonadotropin beta- subunit mRNAs, plasma gonadotropin, and steroids in the female gilthead seabream, Sparus aurata

Y Gothilf, I Meiri, Abigail Elizur and Y Zohar

Biology of Reproduction, Vol.57(5), pp.1145-1154

1997

DOI: https://doi.org/10.1095/biolreprod57.5.1145

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Abstract

Medical and Health Sciences

gonadotropin

mRNA

Gilthead Seabream

Sparus aurata

Gilthead seabream females undergo daily cycles of final oocyte maturation (FOM), ovulation, and spawning throughout their spawning season. FOM consists of lipid droplet and yolk granule coalescence, germinal vesicle (GV) migration, and GV breakdown. Plasma maturational gonadotropin (GtH-II) levels fluctuate throughout the day, reaching a peak at 8 h before spawning, when the GV is at the periphery of the oocyte. The preovulatory GtH-II surge is accompanied by an increase in the plasma levels of 17alpha,20beta-dihydroxy-4-pregnen-3-one and estradiol, while testosterone and 17alpha,20beta,21-trihydroxy-4- pregnen-3-one levels remain unchanged. Concurrent with the preovulatory GtH-II surge, there is an increase in pituitary GtH-II beta subunit mRNA levels followed by an increase in GtH-Ibeta mRNA levels. Gilthead seabream brain contains three different forms of GnRH: salmon (s)GnRH, seabream (sb)GnRH, and chicken (c)GnRH-II. All three GnRH-encoding mRNAs fluctuate throughout the day, reaching highest levels 8 h before spawning, concurrent with the preovulatory GtH-II surge. On the basis of these correlations and of the anatomical organization of the three GnRH systems, it is hypothesized that in the daily-spawning gilthead seabream females, preovulatory GtH-II secretion, and probably synthesis, are induced by a surge of sbGnRH secretion. The involvement of the other two GnRH forms, sGnRH and cGnRH-II, in the control of ovulation and spawning is presumed, on the basis of the elevation of their mRNA levels at the time of the preovulatory GtH-II secretion and spawning.

Details

Title: Preovulatory changes in the levels of three gonadotropin-releasing hormone-encoding messenger ribonucleic acids (mRNAs), gonadotropin beta- subunit mRNAs, plasma gonadotropin, and steroids in the female gilthead seabream, Sparus aurata
Authors: Y Gothilf (Author) - Tel-Aviv University
I Meiri (Author) - Israel Oceanographic and Limnological Research
Abigail Elizur (Author) - University of the Sunshine Coast - Faculty of Science, Health and Education
Y Zohar (Author) - University of Maryland
Publication details: Biology of Reproduction, Vol.57(5), pp.1145-1154
Publisher: Society for the Study of Reproduction
Date published: 1997
DOI: 10.1095/biolreprod57.5.1145
ISSN: 0006-3363
Organisation Unit: University of the Sunshine Coast, Queensland; Centre for Bioinnovation
Language: English
Record Identifier: 99449297202621
Output Type: Journal article

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Web Of Science research areas: Reproductive Biology

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