Effect of 5-HT receptor and adrenoceptor antagonists on micturition in conscious cats.
Micturition was induced in awake cats by infusing saline into the bladder at a physiological filling rate. Methysergide, a serotonergic antagonist given intrathecally, decreased the volume at which micturition occurred. Phentolamine, a non-specific alpha-adrenoceptor antagonist, also decreased volume threshold. Prazosin, an alpha 1-adrenoceptor antagonist, was without effect on micturition. These results imply that 5-HT receptors and alpha 2-adrenoceptors may be inhibitory to micturition at a spinal level.
Department of Pharmacology and Physiology, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.
M J
MJ
Espey
J W
JW
Downie
A
A
Fine
D000317:Adrenergic alpha-Antagonists / Q000494:pharmacology*; D000818:Animals; D002415:Cats; D008297:Male; D008784:Methysergide / Q000494:pharmacology; D009638:Norepinephrine / Q000502:physiology*; D010646:Phentolamine / Q000494:pharmacology; D011224:Prazosin / Q000494:pharmacology; D011942:Receptors, Adrenergic, alpha / Q000502:physiology; D011985:Receptors, Serotonin / Q000502:physiology; D012701:Serotonin / Q000502:physiology*; D012702:Serotonin Antagonists / Q000494:pharmacology*; D014554:Urination / Q000187:drug effects*
D000317:Adrenergic alpha-Antagonists; D011942:Receptors, Adrenergic, alpha; D011985:Receptors, Serotonin; D012702:Serotonin Antagonists; D012701:Serotonin; D009638:Norepinephrine; D011224:Prazosin; D008784:Methysergide; D010646:Phentolamine