Novel apocynin regulates TRPV1 activity in the trigeminal system and controls pain in a temporomandibular joint neurogenic model

Autor
Mendes Matuiama Machado, Taisa Maria
Gonçalves Aquino, Iara
Franchin, Marcelo
Zarraga, Miguel O.
Bustos, Daniel
Papa Spada, Fernanda
Henrique Napimoga, Marcelo
Clemente-Napimoga, Juliana Trindade
Alencar, Severino Matias
Benso, Bruna
Ballassini Abdalla, Henrique
Fecha
2024Resumen
Objective
Herein, we investigate the potential analgesic effect of a newly synthesized chalcone-derived apocynin in a neurogenic pain model.
Methods
Molecular docking was used to foretell the apocynin binding features and dynamics with the TRPV1 channel, and the activity was tested in vitro, using transfected HEK 293T cells with the rat TRPV1 receptor. The analgesic effect of apocynin was investigated using a capsaicin-induced pain model. The expression of TRPV1, TRPA1, TRPM8, and MAPKs was assessed by electrophoresis, and immunosorbent assays were performed to quantify the neurotransmitters Substance P, Glutamate, and CGRP. A survival assay using Galleria mellonella was carried out to determine the toxicity.
Results
We observed that apocynin exhibits greater thermodynamic stability. Upon apocynin ligand binding, it changes the electrostatic potential for a predominantly electronegative state in the interior and neutral in its external vanilloid pocket. Treatment of apocynin induces antinociceptive effects against the noxious challenge of capsaicin. Histologically, apocynin decreased the number of TRPV1+ immunopositive cells. Electrophoresis showed reduced phosphorylation of p44/42 (ERK1/2) and decreased protein levels of substance P, and CGRP. In the survival assay, apocynin showed low toxicity.
Conclusions
In conclusion, we provide proof-of-principles that the newly synthesized apocynin compound effectively prevented nociception in a neurogenic model of orofacial pain.
Fuente
European Journal of Pharmacology, 985, 177093Link de Acceso
Click aquí para ver el documentoIdentificador DOI
doi.org/10.1016/j.ejphar.2024.177093Colecciones
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