Biomaterial Database

[Urethral response to sympathetic nerve stimulation in the cat]. 1991

H Kakizaki, and T Koyanagi, and M Kato

Department of Urology, Hokkaido University School of Medicine.

The responses of the urethra to hypogastric nerve (HGN) and lumbosacral sympathetic chain (SC) stimulation were observed in 25 chloralose-anesthetized cats. Urethral perfusion pressure was monitored as an index of functional urethral responses. SC was stimulated at four points from L4 to S1. Urethral constrictive response induced by HGN stimulation (delta P:HGN) was significantly larger in male cats than in female cats. But there was no difference between male and female cats in urethral constrictive response induced by SC stimulation (delta P:SC). delta P:HGN was significantly larger than delta P:SC in both sexes, and the ratio of delta P:HGN to delta P:SC (L7-S1) was 2.7 to 1 in male cats and 1.7 to 1 in female cats. delta P:HGN was blocked by the alpha-adrenergic antagonist phentolamine (1-2 mg/kg) and reduced about 50% by autonomic ganglion blockade with hexamethonium bromide (2 mg/min, 25-50 mg). delta P:SC was blocked by both phenotolamine and hexamethonium bromide. In order to examine the pathways of projections of sympathetic fibers from the sacral SC to the urethra, HGN, pelvic nerve and pudendal nerve were transected serially. delta P:SC (L7-S1) was decreased 0%, 12% and 50% by transection of HGN, pelvic nerve and pudendal nerve, respectively. After severance of these three nerves, delta P:SC (L7-S1) was reduced 62%, but not abolished. These data suggest: 1) The effect of HGN to the feline urethra is more prominent than that of SC in both sexes and significantly larger response was noted in male cats with HGN stimulation but not with SC.(ABSTRACT TRUNCATED AT 250 WORDS)

UI	MeSH Term	Description	Entries
D008297	Male		Males
D009119	Muscle Contraction	A process leading to shortening and/or development of tension in muscle tissue. Muscle contraction occurs by a sliding filament mechanism whereby actin filaments slide inward among the myosin filaments.	Inotropism,Muscular Contraction,Contraction, Muscle,Contraction, Muscular,Contractions, Muscle,Contractions, Muscular,Inotropisms,Muscle Contractions,Muscular Contractions
D010477	Perfusion	Treatment process involving the injection of fluid into an organ or tissue.	Perfusions
D010646	Phentolamine	A nonselective alpha-adrenergic antagonist. It is used in the treatment of hypertension and hypertensive emergencies, pheochromocytoma, vasospasm of RAYNAUD DISEASE and frostbite, clonidine withdrawal syndrome, impotence, and peripheral vascular disease.	Fentolamin,Phentolamine Mesilate,Phentolamine Mesylate,Phentolamine Methanesulfonate,Phentolamine Mono-hydrochloride,Regitine,Regityn,Rogitine,Z-Max,Mesilate, Phentolamine,Mesylate, Phentolamine,Methanesulfonate, Phentolamine,Mono-hydrochloride, Phentolamine,Phentolamine Mono hydrochloride
D011312	Pressure	A type of stress exerted uniformly in all directions. Its measure is the force exerted per unit area. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)	Pressures
D011942	Receptors, Adrenergic, alpha	One of the two major pharmacological subdivisions of adrenergic receptors that were originally defined by the relative potencies of various adrenergic compounds. The alpha receptors were initially described as excitatory receptors that post-junctionally stimulate SMOOTH MUSCLE contraction. However, further analysis has revealed a more complex picture involving several alpha receptor subtypes and their involvement in feedback regulation.	Adrenergic alpha-Receptor,Adrenergic alpha-Receptors,Receptors, alpha-Adrenergic,alpha-Adrenergic Receptor,alpha-Adrenergic Receptors,Receptor, Adrenergic, alpha,Adrenergic alpha Receptor,Adrenergic alpha Receptors,Receptor, alpha-Adrenergic,Receptors, alpha Adrenergic,alpha Adrenergic Receptor,alpha Adrenergic Receptors,alpha-Receptor, Adrenergic,alpha-Receptors, Adrenergic
D002415	Cats	The domestic cat, Felis catus, of the carnivore family FELIDAE, comprising over 30 different breeds. The domestic cat is descended primarily from the wild cat of Africa and extreme southwestern Asia. Though probably present in towns in Palestine as long ago as 7000 years, actual domestication occurred in Egypt about 4000 years ago. (From Walker's Mammals of the World, 6th ed, p801)	Felis catus,Felis domesticus,Domestic Cats,Felis domestica,Felis sylvestris catus,Cat,Cat, Domestic,Cats, Domestic,Domestic Cat
D004558	Electric Stimulation	Use of electric potential or currents to elicit biological responses.	Stimulation, Electric,Electrical Stimulation,Electric Stimulations,Electrical Stimulations,Stimulation, Electrical,Stimulations, Electric,Stimulations, Electrical
D005260	Female		Females
D005730	Ganglionic Blockers	Agents having as their major action the interruption of neural transmission at nicotinic receptors on postganglionic autonomic neurons. Because their actions are so broad, including blocking of sympathetic and parasympathetic systems, their therapeutic use has been largely supplanted by more specific drugs. They may still be used in the control of blood pressure in patients with acute dissecting aortic aneurysm and for the induction of hypotension in surgery.	Ganglionic Blocking Agents,Ganglioplegic Agents,Blocking Agents, Ganglionic,Ganglionic Blockaders,Agents, Ganglionic Blocking,Agents, Ganglioplegic,Blockaders, Ganglionic,Blockers, Ganglionic