Effects of L-NG-nitro arginine on cholinergic transmission in the gastric muscle of the rabbit.
In the circular muscle of the rabbit gastric corpus, the nitric oxide-synthesis inhibitor L-NG-nitro arginine (L-NOARG), enhanced the neurally-induced cholinergic responses evoked by electrical field stimulation (EFS) and ganglionic stimulating agents (nicotine, dimethylphenyl piperazinium iodide). The muscular contractions caused by acetylcholine (Ach) and methacholine were not influenced by the nitric oxide-synthesis inhibitor. The nitric oxide-releasing compound sodium nitroprusside (SNP) did not affect the Ach-induced muscular responses. Our results suggest that L-NOARG enhances gastric cholinergic responses by removing an inhibitory influence exerted at the prejunctional level in the nerve-muscle pathway.
Baccari
M C
MC
Department of Physiology, University of Florence, Italy.
Bertini
M
M
Calamai
F
F
D000109:Acetylcholine / Q000494:pharmacology; D000818:Animals; D001120:Arginine / Q000031:analogs & derivatives* / Q000494:pharmacology; D004347:Drug Interactions; D004558:Electric Stimulation; D005260:Female; D005730:Ganglionic Blockers / Q000494:pharmacology; D005731:Ganglionic Stimulants / Q000494:pharmacology; D066298:In Vitro Techniques; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects / Q000294:innervation*; D019335:Nitroarginine; D009599:Nitroprusside / Q000494:pharmacology; D010275:Parasympathetic Nervous System / Q000187:drug effects*; D011817:Rabbits; D013270:Stomach / Q000187:drug effects / Q000294:innervation; D009435:Synaptic Transmission / Q000187:drug effects*
D005730:Ganglionic Blockers; D005731:Ganglionic Stimulants; D009599:Nitroprusside; D019335:Nitroarginine; D001120:Arginine; D000109:Acetylcholine