Summary
1. The effects of some naturally occurring pungent substances, piperine, mustard oil, eugenol and curcumin, were compared to those of capsaicin in the rat isolated urinary bladder. 2. All test compounds dose-dependently contracted the rat bladder and produced desensitization toward capsaicin (1 μmol/l). Development of cross-tachyphylaxis among the natural pungent substances on one hand and capsaicin on the other, suggested a common site of action on visceral primary afferents. 3. Contractile responses to piperine, mustard oil and eugenol were partially tetrodotoxin and ruthenium red-sensitive, suggesting that activation of sensory terminals by these agents takes place indirectly, as well as by a direct action on sensory receptors. 4. The presence of the secondary acylamide linkage (present in the backbone of capsaicin, but not in that of test compounds) does not appear to be essential to produce desensitization of sensory nerve terminals.
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Patacchini, R., Maggi, C.A. & Meli, A. Capsaicin-like activity of some natural pungent substances on peripheral endings of visceral primary afferents. Naunyn-Schmiedeberg's Arch Pharmacol 342, 72–77 (1990). https://doi.org/10.1007/BF00178975
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DOI: https://doi.org/10.1007/BF00178975