title: The role of sympathetic and parasympathetic nerve systems on the smooth muscle of rat seminal vesicles - experimental results and speculation for physiological implication on ejaculation.
abstract: Ejaculation is a process involving sympathetic and parasympathetic effects during different stages - emission and ejection. Some conditions of ejaculation dysfunction are associated with autonomic nerves. However, the exact effects of autonomic nerves on ejaculation are not well defined. Autonomic agonists induce different recorded trace patterns of seminal vesicular contraction. The different traces contain different components of phasic and tonic contraction, which may have physiological implications. In this study, we examined isolated rat seminal vesicle (SV) contraction by phenylephrine (PE), acetylcholine, and their respective antagonists and then speculated upon physiological roles of sympathetic and parasympathetic nerves on SV during ejaculation. We found that PE and Ach both achieved good contraction of rat SV. Compared to α1b for sympathetic and M1, M2 for parasympathetic receptors, α1a and M3 are the relatively dominant subtypes on rat SV. Adrenergic and cholinergic agonists cause different trace patterns of SV contraction. We speculated that the sympathetic effect is dominant during emission to squeeze seminal fluid out and that the parasympathetic effect is dominant during ejection to provide an anti-reflux effect on the ejaculatory duct.
authors.affiliation: Urology, National Taiwan University, Taipei, Taiwan.
authors.forename: J-T
authors.initials: JT
authors.lastname: Hsieh
authors.forename: Y-C
authors.initials: YC
authors.lastname: Kuo
authors.forename: H-C
authors.initials: HC
authors.lastname: Chang
authors.forename: S-P
authors.initials: SP
authors.lastname: Liu
authors.forename: J-H
authors.initials: JH
authors.lastname: Chen
authors.forename: V F S
authors.initials: VF
authors.lastname: Tsai
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology; D000322:Adrenergic Agonists / Q000494:pharmacology; D000818:Animals; D018679:Cholinergic Agonists / Q000494:pharmacology; D004542:Ejaculation / Q000502:physiology*; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects / Q000502:physiology; D009130:Muscle, Smooth / Q000294:innervation*; D010275:Parasympathetic Nervous System / Q000502:physiology*; D010656:Phenylephrine / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D043643:Receptor, Muscarinic M1 / Q000502:physiology; D043585:Receptor, Muscarinic M2 / Q000502:physiology; D043587:Receptor, Muscarinic M3 / Q000502:physiology; D018340:Receptors, Adrenergic, alpha-1 / Q000502:physiology; D012669:Seminal Vesicles / Q000294:innervation*; D013564:Sympathetic Nervous System / Q000502:physiology*; D014662:Vasoconstrictor Agents / Q000494:pharmacology; D014665:Vasodilator Agents / Q000494:pharmacology
chemical_list: D000322:Adrenergic Agonists; D018679:Cholinergic Agonists; D043643:Receptor, Muscarinic M1; D043585:Receptor, Muscarinic M2; D043587:Receptor, Muscarinic M3; D018340:Receptors, Adrenergic, alpha-1; D014662:Vasoconstrictor Agents; D014665:Vasodilator Agents; D010656:Phenylephrine; D000109:Acetylcholine
keywords: anti-reflux; autonomic nerve; ejaculation; organ bath; seminal vesicles