Central oxytocinergic and dopaminergic mechanisms regulating penile erection in conscious rats
Autor: | Joseph P. Mikusa, Peter R. Hollingsworth, Robert B. Moreland, Brenda Martino, R. Scott Bitner, Gin C. Hsieh |
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Rok vydání: | 2005 |
Předmět: |
Male
medicine.medical_specialty Apomorphine Injections Subcutaneous Clinical Biochemistry Vasotocin Pharmacology Oxytocin Toxicology Models Biological Biochemistry Dopamine agonist Oxytocin Antagonist Behavioral Neuroscience chemistry.chemical_compound Dopamine Internal medicine medicine Animals Drug Interactions Rats Wistar Clozapine Injections Spinal Biological Psychiatry Injections Intraventricular Dose-Response Relationship Drug business.industry Penile Erection Dopaminergic Rats Endocrinology chemistry Dopamine receptor Dopamine Agonists Dopamine Antagonists business hormones hormone substitutes and hormone antagonists medicine.drug |
Zdroj: | Pharmacology Biochemistry and Behavior. 81:797-804 |
ISSN: | 0091-3057 |
Popis: | A series of in vivo studies in a conscious rat model was conducted to investigate the role of oxytocinergic and dopaminergic neurotransmission in the central regulation of penile erection. Oxytocin, when administrated either intracerebroventricularly (i.c.v.) or intrathecally (i.t.) at the spinal levels of L4-L6, produced dose-related erectogenic effects with a maximum at 0.1 microg/rat i.c.v. or 0.03 microg/rat i.t. Oxytocin-evoked penile activity was attenuated by the inhibitory effect of the selective oxytocin antagonist vasotocin analog [Pmp-Tyr(Me)-Ile-Thr-Asn-Cys]-Pro-Orn-Tyr-NH2 (0.1-1 microg, i.c.v. or i.t.). Penile erection induced by oxytocin was blocked by the dopaminergic receptor antagonist clozapine (1-10 micromol/kg i.p.) in a dose-dependent manner. Conversely, oxytocin antagonist microinjected locally (i.c.v. or i.t.) significantly attenuated the pro-erectile effects of systemic (s.c.) apomorphine, a centrally acting erectogenic agent through dopaminergic receptors. Together, these data indicate a possible concomitant role between dopamine and oxytocin in mediating penile erection at both the spinal and supraspinal sites. |
Databáze: | OpenAIRE |
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