scholarly journals Neuropeptide Y mediates orexin A-mediated suppression of pulsatile gonadotropin-releasing hormone secretion in ovariectomized rats

2011 ◽  
Vol 58 (1,2) ◽  
pp. 11-18 ◽  
Author(s):  
Machiko Kiyokawa ◽  
Toshiya Matsuzaki ◽  
Takeshi Iwasa ◽  
Rie Ogata ◽  
Masahiro Murakami ◽  
...  
Keyword(s):  
Neuropeptide Y ◽  
Hormone Secretion ◽  
Gonadotropin Releasing Hormone ◽  
Ovariectomized Rats ◽  
Orexin A ◽  
Releasing Hormone

scholarly journals In VitroStimulation of the Prepubertal Rat Gonadotropin-Releasing Hormone Pulse Generator by Leptin and Neuropeptide Y through Distinct Mechanisms1

Endocrinology ◽  
2000 ◽  
Vol 141 (4) ◽  
pp. 1464-1469 ◽  
Author(s):  
M. C. Lebrethon ◽  
E. Vandersmissen ◽  
A. Gérard ◽  
A. S. Parent ◽  
J. L. Junien ◽  
...  
Keyword(s):  
Neuropeptide Y ◽  
Pulse Generator ◽  
Gonadotropin Releasing Hormone ◽  
Releasing Hormone

Orchidectomy selectively increases follicle-stimulating hormone secretion in gonadotropin-releasing hormone antagonist-treated male rats

1995 ◽  
Vol 132 (3) ◽  
pp. 357-362 ◽  
Author(s):  
M Tena-Sempere ◽  
L Pinilla ◽  
E Aguilar
Keyword(s):  
Gnrh Antagonist ◽  
Follicle Stimulating Hormone ◽  
Hormone Secretion ◽  
Gonadotropin Releasing Hormone ◽  
Male Rats ◽  
Gonadotropin Secretion ◽  
Releasing Hormone ◽  
Treated Male ◽  
Lh Secretion ◽  
Stimulating Hormone

Tena-Sempere M, Pinilla L, Aguilar E. Orchidectomy selectively increases follicle-stimulating hormone secretion in gonadotropin-releasing hormone agonist-treated male rats. Eur J Endocrinol 1995;132: 357–62. ISSN 0804–4643 The pituitary component of the feedback mechanisms exerted by testicular factors on gonadotropin secretion was analyzed in adult male rats treated with a potent gonadotropin-releasing hormone (GnRH) antagonist. In order to discriminate between androgens and testicular peptides, groups of males were orchidectomized (to eliminate androgens and non-androgenic testicular factors) or injected with ethylene dimethane sulfonate (EDS), a selective toxin for Leydig cells (to eliminate selectively androgens) and treated for 15 days with vehicle or the GnRH antagonist Ac-d-pClPhe-d-pClPhe-d-TrpSer-Tyr-d-Arg-Leu-Arg-Pro-d-Ala-NH2CH3COOH (Org.30276, 5 mg/kg/72 hours). Serum concentrations of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) were measured 7 and 14 days after the beginning of treatment. We found that: in males treated with GnRH antagonist, orchidectomy or EDS treatment did not induce any increase in LH secretion; and orchidectomy, but not EDS treatment, increased FSH secretion in GnRH-treated males. The present results show that negative feedback of testicular factors on LH secretion is mediated completely through changes in GnRH actions. In contrast, a part of the inhibitory action of the testis on FSH secretion is exerted directly at the pituitary level. It can be hypothesized that non-Leydig cell testicular factor(s) inputs at different levels of the hypothalamic–pituitary axis in controlling LH and FSH secretion. Manuel Tena-Sempere, Department of Physiology, Faculty of Medicine, University of Córdoba, 14004 Córdoba, Spain

Regulation of Gonadotropin-Releasing Hormone and Luteinizing Hormone Secretion by AMPA Receptors

1997 ◽  
Vol 66 (4) ◽  
pp. 246-253 ◽  
Author(s):  
Lin Ping ◽  
Virendra B. Mahesh ◽  
Ganapathy K. Bhat ◽  
Darrell W. Brann
Keyword(s):  
Luteinizing Hormone ◽  
Ampa Receptors ◽  
Hormone Secretion ◽  
Gonadotropin Releasing Hormone ◽  
Luteinizing Hormone Secretion ◽  
Releasing Hormone
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