1. TRPA1 mediates the antinociceptive properties of the constituent of Crocus sativus L., safranal
- Author
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Riccardo Patacchini, Pierangelo Geppetti, Ilaria M. Marone, Romina Nassini, Simone Li Puma, Viola Seravalli, Francesco De Logu, Sergio J. Macedo, Elisabetta Coppi, Serena Materazzi, and Lorenzo Landini
- Subjects
Nociception ,0301 basic medicine ,calcitonin gene‐related peptide ,Pharmacology ,Mice ,chemistry.chemical_compound ,0302 clinical medicine ,Dorsal root ganglion ,Isothiocyanates ,Ganglia, Spinal ,pain ,TRPA1 Cation Channel ,Neurons ,Analgesics ,neurogenic inflammation ,Chemistry ,food and beverages ,safranal ,calcitonin gene-related peptide ,transient receptor potential ankyrin 1 ,Safranal ,medicine.anatomical_structure ,030220 oncology & carcinogenesis ,Nociceptor ,Molecular Medicine ,Original Article ,Sesquiterpenes ,psychological phenomena and processes ,Agonist ,medicine.drug_class ,TRPV1 ,TRPV Cation Channels ,Calcitonin gene-related peptide ,Partial agonist ,Cell Line ,03 medical and health sciences ,Cyclohexenes ,medicine ,Animals ,Humans ,Terpenes ,Original Articles ,Cell Biology ,Crocus ,Mice, Inbred C57BL ,HEK293 Cells ,030104 developmental biology ,nervous system ,Calcium Channels - Abstract
Safranal, contained in Crocus sativus L., exerts anti‐inflammatory and analgesic effects. However, the underlying mechanisms for such effects are poorly understood. We explored whether safranal targets the transient receptor potential ankyrin 1 (TRPA1) channel, which in nociceptors mediates pain signals. Safranal by binding to specific cysteine/lysine residues, stimulates TRPA1, but not the TRP vanilloid 1 and 4 channels (TRPV1 and TRPV4), evoking calcium responses and currents in human cells and rat and mouse dorsal root ganglion (DRG) neurons. Genetic deletion or pharmacological blockade of TRPA1 attenuated safranal‐evoked release of calcitonin gene‐related peptide (CGRP) from rat and mouse dorsal spinal cord, and acute nociception in mice. Safranal contracted rat urinary bladder isolated strips in a TRPA1‐dependent manner, behaving as a partial agonist. After exposure to safranal the ability of allyl isothiocyanate (TRPA1 agonist), but not that of capsaicin (TRPV1 agonist) or GSK1016790A (TRPV4 agonist), to evoke currents in DRG neurons, contraction of urinary bladder strips and CGRP release from spinal cord slices in rats, and acute nociception in mice underwent desensitization. As previously shown for other herbal extracts, including petasites or parthenolide, safranal might exert analgesic properties by partial agonism and selective desensitization of the TRPA1 channel.
- Published
- 2019
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