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Abstract:

Orexins are peptides controlling feeding, sleep, and neuroendocrine functions. They are synthesized by the hypothalamus with projections throughout the brain. Orexins and their orexin 1 (OX1) and orexin 2 receptors (OX2) are present outside the central nervous system. Here the expression of preproorexin (PPO), OX1, and OX2 was studied in rat ovaries. PPO, OX1, and OX2 were determined by quantitative real-time RT-PCR in ovaries of cycling Sprague-Dawley rats on all days of the cycle. Serum hormones and food consumption were determined. Ovarian OX1 and OX2 expression was then studied after ovulation blockade with Cetrorelix or Nembutal. Finally, proestrous rats were treated at 1400 and 1900 with a selective OX1 antagonist (SB-334867-A) and/or a selective OX2 antagonist (JNJ-10397049), and hormone levels, ovulation, and ovarian histology were studied. Both receptors' expression increased in the ovary between 1700 and 2300 of proestrus exclusively, in coincidence with hormone peaks, but not with the dark-light cycle or food intake. PPO was not detected. Cetrorelix or Nembutal prevented the increases of OX1 and OX2 while blunting gonadotropin peaks. SB-334867-A and JNJ-10397049, alone or combined, decreased serum gonadotropins and reduced ova number the following morning; ovaries showed a bloody (hyperemic and/or hemorrhagic) reaction with more preovulatory follicles and less corpora lutea. Here we demonstrate for the first time an increased ovarian expression of both OX1 and OX2, only during proestrous afternoon, and its hormone dependence but not dependence on the dark-light cycle. Two new receptor antagonists reduced proestrous gonadotropins and/or ova number while producing ovarian structural changes. Copyright © 2007 the American Physiological Society.

Registro:

Documento: Artículo
Título:Both orexin receptors are expressed in rat ovaries and fluctuate with the estrous cycle: Effects of orexin receptor antagonists on gonadotropins and ovulation
Autor:Silveyra, P.; Lux-Lantos, V.; Libertun, C.
Filiación:Instituto de Biología Y Medicina Experimental, Consejo Nacional de Investigaciones Científicas Y Técnicas, Universidad de Buenos Aires, Buenos Aires, Argentina
Departamento de Química Biológica, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
V. de Obligado 2490, C1428ADN Buenos Aires, Argentina
Palabras clave:Orexin 1 and orexin 2 receptor antagonists; Ovary; cetrorelix; gonadotropin; jnj 10397049; orexin; orexin 1 receptor; orexin 2 receptor; pentobarbital; preproorexin; receptor blocking agent; sb 334867 a; unclassified drug; animal experiment; animal tissue; article; bleeding; controlled study; estrus cycle; female; food intake; gonadotropin blood level; histology; hyperemia; light dark cycle; nonhuman; ovulation; priority journal; proestrus; protein expression; quantitative assay; rat; real time polymerase chain reaction; reverse transcription polymerase chain reaction; Sprague Dawley rat; Animals; Benzoxazoles; Dioxanes; Eating; Estrous Cycle; Female; Gene Expression Regulation; Gonadotropin-Releasing Hormone; Gonadotropins; Intracellular Signaling Peptides and Proteins; Neuropeptides; Ovary; Ovulation; Pentobarbital; Phenylurea Compounds; Rats; Rats, Sprague-Dawley; Receptors, G-Protein-Coupled; Receptors, Neuropeptide; RNA, Messenger; Urea
Año:2007
Volumen:293
Número:4
Página de inicio:E977
Página de fin:E985
DOI: http://dx.doi.org/10.1152/ajpendo.00179.2007
Título revista:American Journal of Physiology - Endocrinology and Metabolism
Título revista abreviado:Am. J. Physiol. Endocrinol. Metab.
ISSN:01931849
CODEN:AJPMD
CAS:cetrorelix, 120287-85-6; gonadotropin, 63231-54-9; pentobarbital, 57-33-0, 76-74-4; 1-(2-methylbenzoxazol-6-yl)-3-(1,5)naphthyridin-4-yl urea; Benzoxazoles; Dioxanes; Gonadotropin-Releasing Hormone, 33515-09-2; Gonadotropins; Intracellular Signaling Peptides and Proteins; JNJ-10397049; Neuropeptides; Pentobarbital, 76-74-4; Phenylurea Compounds; RNA, Messenger; Receptors, G-Protein-Coupled; Receptors, Neuropeptide; Urea, 57-13-6; cetrorelix, 120287-85-6; orexin receptors; orexins
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01931849_v293_n4_pE977_Silveyra

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Citas:

---------- APA ----------
Silveyra, P., Lux-Lantos, V. & Libertun, C. (2007) . Both orexin receptors are expressed in rat ovaries and fluctuate with the estrous cycle: Effects of orexin receptor antagonists on gonadotropins and ovulation. American Journal of Physiology - Endocrinology and Metabolism, 293(4), E977-E985.
http://dx.doi.org/10.1152/ajpendo.00179.2007
---------- CHICAGO ----------
Silveyra, P., Lux-Lantos, V., Libertun, C. "Both orexin receptors are expressed in rat ovaries and fluctuate with the estrous cycle: Effects of orexin receptor antagonists on gonadotropins and ovulation" . American Journal of Physiology - Endocrinology and Metabolism 293, no. 4 (2007) : E977-E985.
http://dx.doi.org/10.1152/ajpendo.00179.2007
---------- MLA ----------
Silveyra, P., Lux-Lantos, V., Libertun, C. "Both orexin receptors are expressed in rat ovaries and fluctuate with the estrous cycle: Effects of orexin receptor antagonists on gonadotropins and ovulation" . American Journal of Physiology - Endocrinology and Metabolism, vol. 293, no. 4, 2007, pp. E977-E985.
http://dx.doi.org/10.1152/ajpendo.00179.2007
---------- VANCOUVER ----------
Silveyra, P., Lux-Lantos, V., Libertun, C. Both orexin receptors are expressed in rat ovaries and fluctuate with the estrous cycle: Effects of orexin receptor antagonists on gonadotropins and ovulation. Am. J. Physiol. Endocrinol. Metab. 2007;293(4):E977-E985.
http://dx.doi.org/10.1152/ajpendo.00179.2007