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The aim of the present study was to examine the acute and chronic effects of the gonadotropin-releasing hormone agonist (GnRH-a) leuprolide acetate (LA) on the expression of the steroidogenic acute regulatory protein (StAR), the cytochrome P450 side-chain cleavage enzyme (P450scc), and steroid production in antral ovarian follicles obtained from prepubertal equine choriogonadotropin (eCG)-treated rats. Follicular contents of StAR and P450scc proteins were measured by Western blotting following in vivo injection of eCG (control) and eCG+LA (LA) to prepubertal rats. Treatment with eCG for 2 h resulted in no change in StAR protein content, but it was markedly increased at 4 and 8 h after hormone treatment. However, coadministration of eCG+LA produced a significant increase (P < 0.05) in StAR protein levels at 2, 4, and 8 h when compared with eCG treatment. Acute and chronic treatment with either eCG or eCG+LA did not alter the P450scc protein levels in freshly isolated follicles. The increase in StAR protein expression following LA treatment was qualitatively similar to StAR mRNA expression, as determined by quantitative reverse transcription-polymerase chain reaction (RT-PCR) analysis. Furthermore, administration of eCG demonstrated a time-dependent increase (2-8 h) in the levels of StAR mRNA, and these levels were markedly increased by eCG+LA. However, the temporal response pattern of StAR mRNA was much greater at 2 h following LA administration when compared with controls. In addition, 48 h of LA treatment in eCG-treated rats resulted in a significant increase (P < 0.05) in follicular progesterone levels, whereas significant decreases in androgen (testosterone and androsterone) and estradiol levels were observed. Similar results were obtained when serum androgens and estradiol were measured, but serum progesterone levels were unchanged. Collectively, these findings demonstrate that the inhibitory effect of LA on ovarian androgen and estradiol levels is related to changes in the follicular levels of StAR protein and steroid production.


Documento: Artículo
Título:Steroidogenic acute regulatory protein in ovarian follicles of gonadotropin-stimulated rats is regulated by a gonadotropin-releasing hormone agonist
Autor:Irusta, G.; Parborell, F.; Peluffo, M.; Manna, P.R.; Gonzalez-Calvar, S.I.; Calandra, R.; Stocco, D.M.; Tesone, M.
Filiación:Inst. de Biol./Med. Exp. (IBYME), Facultad de Ciencias Exactas, Univ. Buenos Aires/Nac. de la Plata, 1428 Buenos Aires, Argentina
Department of Cell Biology, Texas Tech. Univ. Hlth. Sci. Center, Lubbock, TX 79430, United States
Inst. de Biol./Medicina Experimental, Obligado 2490, 1428 Buenos Aires, Argentina
Palabras clave:Follicle; Follicular development; Gonadotropin-releasing hormone; Ovary; Steroid hormones; androgen; androsterone; cholesterol monooxygenase (side chain cleaving); chorionic gonadotropin; gonadotropin; growth hormone releasing factor agonist; leuprorelin; messenger RNA; progesterone; steroidogenic acute regulatory protein; testosterone; unclassified drug; animal cell; animal experiment; animal tissue; article; controlled study; dose response; female; hormonal therapy; nonhuman; ovary follicle; prepuberty; priority journal; protein expression; rat; regulatory mechanism; reverse transcription polymerase chain reaction; steroidogenesis; Androgens; Animals; Blotting, Western; Cholesterol Side-Chain Cleavage Enzyme; Estradiol; Female; Gonadotropin-Releasing Hormone; Gonadotropins; Gonadotropins, Equine; Leuprolide; Ovarian Follicle; Ovary; Phosphoproteins; Progesterone; Radioimmunoassay; Rats; Rats, Sprague-Dawley; Reverse Transcriptase Polymerase Chain Reaction; Steroids; Stimulation, Chemical; Animalia; Equidae; Eukaryota
Página de inicio:1577
Página de fin:1583
Título revista:Biology of Reproduction
Título revista abreviado:Biol. Reprod.
CAS:androsterone, 53-41-8; cholesterol monooxygenase (side chain cleaving), 37292-81-2; chorionic gonadotropin, 9002-61-3; gonadotropin, 63231-54-9; leuprorelin, 53714-56-0, 74381-53-6; progesterone, 57-83-0; steroidogenic acute regulatory protein, 168183-61-7; testosterone, 58-22-0; Androgens; Cholesterol Side-Chain Cleavage Enzyme, EC; Estradiol, 50-28-2; Gonadotropin-Releasing Hormone, 33515-09-2; Gonadotropins; Gonadotropins, Equine; Leuprolide, 53714-56-0; Phosphoproteins; Progesterone, 57-83-0; steroidogenic acute regulatory protein; Steroids


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---------- APA ----------
Irusta, G., Parborell, F., Peluffo, M., Manna, P.R., Gonzalez-Calvar, S.I., Calandra, R., Stocco, D.M.,..., Tesone, M. (2003) . Steroidogenic acute regulatory protein in ovarian follicles of gonadotropin-stimulated rats is regulated by a gonadotropin-releasing hormone agonist. Biology of Reproduction, 68(5), 1577-1583.
---------- CHICAGO ----------
Irusta, G., Parborell, F., Peluffo, M., Manna, P.R., Gonzalez-Calvar, S.I., Calandra, R., et al. "Steroidogenic acute regulatory protein in ovarian follicles of gonadotropin-stimulated rats is regulated by a gonadotropin-releasing hormone agonist" . Biology of Reproduction 68, no. 5 (2003) : 1577-1583.
---------- MLA ----------
Irusta, G., Parborell, F., Peluffo, M., Manna, P.R., Gonzalez-Calvar, S.I., Calandra, R., et al. "Steroidogenic acute regulatory protein in ovarian follicles of gonadotropin-stimulated rats is regulated by a gonadotropin-releasing hormone agonist" . Biology of Reproduction, vol. 68, no. 5, 2003, pp. 1577-1583.
---------- VANCOUVER ----------
Irusta, G., Parborell, F., Peluffo, M., Manna, P.R., Gonzalez-Calvar, S.I., Calandra, R., et al. Steroidogenic acute regulatory protein in ovarian follicles of gonadotropin-stimulated rats is regulated by a gonadotropin-releasing hormone agonist. Biol. Reprod. 2003;68(5):1577-1583.