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Regional differences in the effects of capsaicin and tachykinins on motor activity and vascular permeability of the rat lower urinary tract

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Summary

1. The effects of capsaicin, substance P (SP) and neurokinin A (NKA) on motor activity and vascular permeability was investigated in the rat lower urinary tract (bladder dome and neck, proximal urethra and ureters). 2. Capsaicin produced contractions of the rat bladder dome and neck and of the proximal urethra in vitro, which were unaffected by tetrodotoxin and abolished by ganglionectomy. SP and NKA were almost equipotent in producing a contraction of the rat isolated bladder dome or neck and urethra. However, the maximal response to NKA was about twice that of SP on the urethra and bladder neck. 3. Capsaicin did not affect motility of the unstimulated rat isolated ureter, while NKA or SP activated rhythmic contractions, NKA being about 850 times more potent than SP. Either capsaicin or field stimulation produced a transient inhibition of the NKA-activated rhythmic contractions of the rat isolated ureter which was prevented by capsaicin-desensitization. 4. The capsaicin-(1 μM) or field stimulation-induced inhibition of NKA-activated rhythmic contractions of the rat isolated ureter were unaffected by removal of pelvic ganglia but abolished by cold storage (72 h at 4°C). 5. Intravenous capsaicin induced an inflammatory response (Evans blue leakage) in the bladder, proximal urethra and ureters in vivo. Plasma extravasation was greater in the ureters, urethra and bladder neck than in the dome. SP, NKA and histamine produced a dose-dependent dye leakage in all segments of the rat urinary tract, the response being slightly greater in the bladder neck than in the dome. 6. The capsaicin-induced inflammatory response was abolished by systemic capsaicin-desensitization and reduced, to a variable extent, by pelvic ganglionectomy, in the various tissues examined. Topical application of tetrodotoxin on the bladder dome failed to affect the capsaicin-induced plasma extravasation in the urinary bladder. 7. These findings indicate that chemoceptive, capsaicin-sensitive nerves are present throughout the whole rat lower urinary tract and their activation determines a variety of visceromotor responses and an increase of vascular permeability. In various instances the response to capsaicin may be explained by the action of tachykinins but some effects may involve other sensory neuropeptides.

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Maggi, C.A., Santicioli, P., Abelli, L. et al. Regional differences in the effects of capsaicin and tachykinins on motor activity and vascular permeability of the rat lower urinary tract. Naunyn-Schmiedeberg's Arch Pharmacol 335, 636–645 (1987). https://doi.org/10.1007/BF00166980

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