1997
Evidence Showing That β-Endorphin Regulates Cyclic Guanosine 3′,5′-Monophosphate (cGMP) Efflux: Anatomical and Functional Support for an Interaction between Opiates and Nitric Oxide
Pu S, Horvath TL, Diano S, Naftolin F, Kalra PS, Kalra SP. Evidence Showing That β-Endorphin Regulates Cyclic Guanosine 3′,5′-Monophosphate (cGMP) Efflux: Anatomical and Functional Support for an Interaction between Opiates and Nitric Oxide. Endocrinology 1997, 138: 1537-1543. PMID: 9075713, DOI: 10.1210/endo.138.4.5086.Peer-Reviewed Original ResearchConceptsExcitatory amino acidsMedial preoptic areaCGMP/Opioid influenceGnRH secretionNitric oxidePreoptic areaN-methyl-D-aspartate receptorsMu-opiate receptor agonistNOS-immunopositive cellsNOS-immunoreactive neuronsPituitary LH secretionOpiate receptor agonistsOpiate receptor antagonistRelease of GnRHCentral nervous systemDirect inhibitory controlExcitatory NMDATonic restraintLH secretionEndogenous opioidsNOS pathwayReceptor antagonistBeta-endorphinGonadal steroids
1993
Role of neuropeptide-Y in episodic luteinizing hormone release in ovariectomized rats: an excitatory component and opioid involvement
Xu B, Sahu A, Crowley WR, Leranth C, Horvath T, Kalra SP. Role of neuropeptide-Y in episodic luteinizing hormone release in ovariectomized rats: an excitatory component and opioid involvement. Endocrinology 1993, 133: 747-754. PMID: 8344213, DOI: 10.1210/endo.133.2.8344213.Peer-Reviewed Original ResearchConceptsEpisodic LH secretionPlasma LH levelsLH releaseLH secretionLH pulsesExcitatory componentLH levelsOVX ratsOvariectomized ratsMean plasma LH levelsAlpha-helical CRHBeta-endorphin neuronsInhibitory LH responseSuppression of LHLH pulse frequencyInfusion of naloxoneContinuous intraventricular infusionFrequency of LHRole of neuropeptidesNormal rabbit serumExogenous NPYNPY injectionLH responseIntracerebroventricular administrationIntraventricular administration
1992
Neuropeptide-Y innervation of beta-endorphin-containing cells in the rat mediobasal hypothalamus: a light and electron microscopic double immunostaining analysis
Horvath TL, Naftolin F, Kalra SP, Leranth C. Neuropeptide-Y innervation of beta-endorphin-containing cells in the rat mediobasal hypothalamus: a light and electron microscopic double immunostaining analysis. Endocrinology 1992, 131: 2461-2467. PMID: 1425443, DOI: 10.1210/endo.131.5.1425443.Peer-Reviewed Original ResearchConceptsPituitary LH releaseLH releaseOvariectomized ratsMediobasal hypothalamusSynaptic connectionsNPY-immunoreactive axonsBeta-endorphin systemSynaptic membrane specializationsRat mediobasal hypothalamusDirect synaptic connectionsDiaminobenzidine reactionLHRH neuronsNPY neuronsDual effectHypothalamic NPYLH secretionMedial basalLHRH secretionOvarian steroidsPrecise neural mechanismsFemale ratsAxon terminalsElectron microscopic examinationPeptidergic systemsNeuroendocrine regulation