Abstract
1. 1. The relaxing responses of the atropine-treated isolated rat duodenum to 12 μM nicotine (N) and transmural electrical stimulation (S) have been compared. 2. 2. The effects of both N and S were unaffected by 3–30 μM guanethidine or previous reserpinization (1 mg/kg, i.p. during 5 days). 3. 3. The effects of N and S were completely blocked by 0.5–2.0 mM procaine, 0.1 mM butacaine or 0.3–1.2 μM tetrodotoxin. 4. 4. The relaxing response to N but not that to S was blocked by 0.3 mM hexamethonium or 3 μM mecamylamine and absent in the nicotine-desensitized preparation. 5. 5. The effects of both N and S were unaffected in the adenosine-5′-triphosphate (ATP)-desensitized preparation. 6. 6. It is suggested that the nonadrenergic and noncholinergic (NANC) relaxation of the rat duodenum in response to N and S is also nonpurinergic.
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