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• W2041474521 abstract "A [3H]-resiniferatoxin (RTX) binding assay utilizing rat spinal cord membranes was employed to identify novel vanilloids in a collection of natural products of fungal origin. Of the five active compounds found (scutigeral, acetyl-scutigeral, ovinal, neogrifolin, and methyl-neogrifolin), scutigeral (Ki=19 μM), isolated from the edible mushroom Albatrellus ovinus, was selected for further characterization. Scutigeral induced a dose-dependent 45Ca uptake by rat dorsal root ganglion neurons with an EC50 of 1.6 μM, which was fully inhibited by the competitive vanilloid receptor antagonist capsazepine (IC50=5.2 μM). [3H]-RTX binding isotherms were shifted by scutigeral (10–80 μM) in a competitive manner. The Schild plot of the data had a slope of 0.8 and gave an apparent Kd estimate for scutigeral of 32 μM. Although in the above assays scutigeral mimicked capsaicin, it was not pungent on the human tongue up to a dose of 100 nmol per tongue, nor did it provoke protective wiping movements in the rat (up to 100 μM) upon intraocular instillation. In accord with being non-pungent, scutigeral (5 μM) did not elicit a measurable inward current in isolated rat dorsal root ganglion neurons under voltage-clamp conditions. It did, however, reduce the proportion of neurons (from 61 to 15%) that responded to a subsequent capsaicin (1 μM) challenge. In these neurons, scutigeral both delayed (from 27 to 72 s) and diminished (from 5.0 to 1.9 nA) the maximal current evoked by capsaicin. In conclusion, scutigeral and its congeners form a new chemical class of vanilloids, the triprenyl phenols. Scutigeral promises to be a novel chemical lead for the development of orally active, non-pungent vanilloids. British Journal of Pharmacology (1999) 126, 1351–1358; doi:10.1038/sj.bjp.0702440" @default.
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• W2041474521 date "1999-03-01" @default.
• W2041474521 modified "2023-10-14" @default.
• W2041474521 title "A non-pungent triprenyl phenol of fungal origin, scutigeral, stimulates rat dorsal root ganglion neurons <i>via</i> interaction at vanilloid receptors" @default.
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• W2041474521 doi "https://doi.org/10.1038/sj.bjp.0702440" @default.
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