..., and potassium-induced AVP secretion without altering the AVP content of the cell cultures. Furthermore, the opioid peptide [D-Pro 10 ]Dynorphin( 1–11 ) which acts via the ĸ opioid receptor, significantly inhibited basal and potassium-stimulated AVP secretion, an effect which was abolished when cells were...

..., opioids, neuropeptides, and neurotransmitters significantly modulated the pineal androgen receptor population: cyproterone acetate and monosodium glutamate suppressed CR; growth hormone releasing hormone increased NR; growth hormone release inhibiting hormone had no significant effects on either group...

...Scott Whisnant; Robert L. Havern; Robert L. Goodman Evidence suggests that endogenous opioid peptides (EOP) inhibit pulsatile luteinizing hormone (LH) secretion during both the luteal and follicular phases of the ovine estrous cycle. Further data from sheep and other species indicate...

... endogenous opiate suppression of hypothalamic GnRH release since Nx partially blocks the effect of stress. Restraint Stress Reproduction Opioids Luteinizing hormone Testosterone Cortisol Primates 22 04 1991 15 08 1991 7 4 2008 Original Paper Neuroendocrinology 1992;55:405-415...

...G. Clarissa Desjardins; James R. Brawer; Alain Beaudet Estradiol valerate (EV) treatment in the rat induces a lesion of the hypothalamic arcuate nucleus, resulting in significant decreases in hypothalamic β-endorphin. In addition, the EV treatment causes a selective increase in µ-opioid binding...

... and elevated LH secretion in the female rat, and they demonstrate a sex difference in the ability of GABAA and GABAB receptor activation to modulate naloxone-stimulated LH secretion. GABA Opioids LH Gonadotropins Naloxone 5 11 1991 28 01 1992 7 4 2008 © 1992 S. Karger AG, Basel...

...Ettore Ciro degli Uberti; Severn Salvadori; Giorgio Trasforini; Angelo Margutti; Maria Rosaria Ambrosio; Roberta Rossi; Francesco Portaluppi; Luciana Vergnani; Raffaele Pansini To investigate the role of ∂-opioid receptors in the modulation of growth hormone (GH) secretion, we compared in normal...

...Maria I. González-Quijano; Carmen Ariznavarreta; Ana I. Martín; Jesus A.F. Treguerres; Asuncion López-Calderón There is considerable evidence suggesting that endogenous opioids may play an important role in acute stress-induced decreases in luteinizing hormone (LH) release. Studies were undertaken...

...Giuseppe Delitala; Mario Palermo; Paolo Tomasi; Michael Besser; Ashley Grossman It has previously been suggested that endogenous opioid peptides may suppress the pituitary-adrenal axis inhibiting an excitatory α 1 -adrenoceptor input to neural mechanisms liberating corticotrophin-releasing factor...

...Phyllis E. Mann; Craig H. Kinsley; Robert S. Bridges Central or systemic administration of morphine disrupts maternal behavior in steroid-primed, pup-induced virgin and lactating rats. Morphine, the prototypical µ agonist, also interacts with different opioid receptor subtypes. The present study...

...Donatella Dondi; Roberto Maggi; Alberto E. Panerai; Flavio Piva; Patrizia Limonta The concentrations of β-endorphin have been shown to change in the rat brain during pregnancy and lactation. This study has been performed in order to analyze whether also brain opioid receptors might undergo...

...Angelo Cagnacci; Gian Benedetto Melis; Renza Soldani; Ubaldo Bonuccelli; Paola Piccini; Alessandro Napolitano; Alberto Muratorio; Piero Fioretti The secretion of gonadotropins and the role exerted by the endogenous opioid system on luteinizing hormone (LH) secretion were investigated in 6...

... to further characterize the opiate receptors mediating this inhibitory action, we have now investigated the effects of a variety of opioid compounds with relatively high selectivity for µ-, ĸ- and δ-opiate receptors on K + -stimulated CRF-41 release. The selective µ-opioid receptor agonist 202–250 inhibited...

...Saad Al-Damluji; Pierre Bouloux; Anne White; Michael Besser This study examined the effects of an alpha-2-adrenoceptor antagonist on the secretion of ACTH basally and in response to the opioid antagonist naloxone, which is known to stimulate ACTH secretion by an adrenergic mechanism. Eight normal...

...Paul A. Garris; Nira Ben-Jonathan Opioid peptides are present in both the posterior pituitary (PP) and stalk-median eminence (SME). Their effects on the dopaminergic neurons in the SME are well documented, but little is known concerning their role in the regulation of dopamine (DA) release from...

... 20 02 1987 2 4 2008 Naloxone Opioids Androgen Steroidogenesis Prolactin Luteinizing hormone Postnatal development © 1987 S. Karger AG, Basel 1987 Copyright / Drug Dosage / Disclaimer Copyright: All rights reserved. No part of this publication may be translated into other...

... a direct biochemical association between steroid- and endogenous opioid-containing neuronal elements in brain, we have reexamined the issue of whether long-term castration influences opiate receptors in whole male rat brain. To accomplish this goal, we incorporated all of the critical procedural variables...

...Alan N. Elias; Nosratola D. Vaziri; M.R. Pandian; Krish Iyer; Mohammad A. Ansari The role of endogenous opioids in the control of thyroid-stimulating hormone (TSH) secretion in uremic male rats was investigated using the narcotic antagonist naloxone. In order to eliminate the effect of weight loss...

...Felice Petraglia; Wylie Vale; Catherine Rivier In the rat, exposure to stress increases prolactin (Prl) secretion, and endogenous opioid peptides (EOP) are believed to play a role in this response. The aim of the present study was to evaluate the specific involvement of the different EOP (i.e. β...

...Robert S. Bridges; Paul M. Ronsheim Changes in opioid concentrations in brain and plasma as well as opioid activity have been reported to occur as a function of pregnancy and lactation in rats. The present study examines the status and steroidal regulation of the endogenous opioid, beta-endorphin...