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Abstract:

The purpose of this study was to evaluate the effects of GnRH-analog (Leuprolide acetate, LA) administration on follicular luteinization in equine chorionic gonadotropin plus human chorionic gonadotropin (eCG + hCG)- superovulated prepubertal treated rats. Results indicate that LA treatment decreases circulating levels of progesterone (P) and P accumulation in collagenase-dispersed ovarian cell cultures, though estradiol (E2) production is increased. These data suggest that cells from the LA group may be less luteinized following gonadotropin treatment. Studies performed on histological ovarian sections after different times of eCG administration showed that LA injections produce lower amounts of corpora lutea and antral follicles, and a greater number of atretic and preantral follicles. The basal and LH-stimulated P and progestagen accumulations are decreased in incubations of corpora lutea isolated from the LA group. In addition, the mitochondrial cholesterol side-chain cleavage (P450(SCC)) levels in corpora lutea from LA-treated rats are reduced, indicating that the decrease in P production observed is due in part to an alteration in the steroidogenic luteal capability. Immunocytochemical localization of nuclei exhibiting DNA fragmentation by the technique of terminal deoxynucleotidyl transferase end- labeling showed that LA treatment causes an increase in the number of apoptotic cells in preantral and antral follicles at all times studied (1, 2, 4, or 7 days of LA administration). A similar effect, though less pronounced, was observed in corpora lutea. It is concluded that LA treatment produces a failure in the steroidogenic luteal capability and an increase of apoptotic mechanisms in the ovary, producing as a consequence an interference in the follicular recruitment, growth, and luteinization induced by gonadotropins.

Registro:

Documento: Artículo
Título:Regulation of follicular luteinization by a gonadotropin-releasing hormone agonist: Relationship between steroidogenesis and apoptosis
Autor:Andreu, C.; Parborell, F.; Vanzulli, S.; Chemes, H.; Tesone, M.
Filiación:Inst. de Biol. y Med. Experimental, CONICET, Buenos Aires, Argentina
Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Academia Nacional de Medicina, Buenos Aires, Argentina
Ctro. de Invest. Endocrinologicas, Buenos Aires, Argentina
Inst. de Biol. y Med. Experimental, Obligado 2490 (1428), Buenos Aires, Argentina
Palabras clave:Apoptosis; Follicular luteinization; GnRH-a; Ovary; Steroidogenesis; chorionic gonadotropin; equine chorionic gonadotropin; estradiol; gonadorelin agonist; leuprorelin; novormon; progesterone; unclassified drug; animal cell; animal experiment; apoptosis; article; cell death; controlled study; corpus luteum function; nonhuman; ovary follicle development; priority journal; progesterone blood level; rat; steroidogenesis; subcutaneous drug administration; Animals; Apoptosis; Female; Fertility Agents, Female; Gonadotropin-Releasing Hormone; Humans; Leuprolide; Luteal Phase; Ovarian Follicle; Rats; Rats, Sprague-Dawley; Animalia; Equidae
Año:1998
Volumen:51
Número:3
Página de inicio:287
Página de fin:294
DOI: http://dx.doi.org/10.1002/(SICI)1098-2795(199811)51:3<287::AID-MRD8>3.0.CO;2-L
Título revista:Molecular Reproduction and Development
Título revista abreviado:Mol. Reprod. Dev.
ISSN:1040452X
CODEN:MREDE
CAS:Fertility Agents, Female; Gonadotropin-Releasing Hormone, 33515-09-2; Leuprolide, 53714-56-0
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1040452X_v51_n3_p287_Andreu

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Citas:

---------- APA ----------
Andreu, C., Parborell, F., Vanzulli, S., Chemes, H. & Tesone, M. (1998) . Regulation of follicular luteinization by a gonadotropin-releasing hormone agonist: Relationship between steroidogenesis and apoptosis. Molecular Reproduction and Development, 51(3), 287-294.
http://dx.doi.org/10.1002/(SICI)1098-2795(199811)51:3<287::AID-MRD8>3.0.CO;2-L
---------- CHICAGO ----------
Andreu, C., Parborell, F., Vanzulli, S., Chemes, H., Tesone, M. "Regulation of follicular luteinization by a gonadotropin-releasing hormone agonist: Relationship between steroidogenesis and apoptosis" . Molecular Reproduction and Development 51, no. 3 (1998) : 287-294.
http://dx.doi.org/10.1002/(SICI)1098-2795(199811)51:3<287::AID-MRD8>3.0.CO;2-L
---------- MLA ----------
Andreu, C., Parborell, F., Vanzulli, S., Chemes, H., Tesone, M. "Regulation of follicular luteinization by a gonadotropin-releasing hormone agonist: Relationship between steroidogenesis and apoptosis" . Molecular Reproduction and Development, vol. 51, no. 3, 1998, pp. 287-294.
http://dx.doi.org/10.1002/(SICI)1098-2795(199811)51:3<287::AID-MRD8>3.0.CO;2-L
---------- VANCOUVER ----------
Andreu, C., Parborell, F., Vanzulli, S., Chemes, H., Tesone, M. Regulation of follicular luteinization by a gonadotropin-releasing hormone agonist: Relationship between steroidogenesis and apoptosis. Mol. Reprod. Dev. 1998;51(3):287-294.
http://dx.doi.org/10.1002/(SICI)1098-2795(199811)51:3<287::AID-MRD8>3.0.CO;2-L