• FerreiraRenata C MRCMDepartment of Pharmacology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil., Douglas L de Almeida, DuarteIgor D GIDGDepartment of Pharmacology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil., Daniele C Aguiar, Fabrício A Moreira, and RomeroThiago R LTRLDepartment of Pharmacology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil..
• Department of Pharmacology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Brazil.
• Eur J Pain. 2022 Apr 1; 26 (4): 825-834.

BckgroundAripiprazole is an antipsychotic drug used to treat schizophrenia and bipolar disorder. Recently, its peripheral analgesic component was evaluated, however, the mechanism involved in this effect is not fully established. Therefore, the aim of the study was to obtain pharmacological evidence for the involvement of the nitric oxide system in the peripheral antinociceptive effect induced by aripiprazole.MethodsThe hyperalgesia was induced via intraplantar injection of prostaglandin E2 in mice and the nociceptive thresholds were evaluated using the paw pressure test. All drugs were injected locally into the right hind paw.ResultsThe PI3K inhibitor (AS605240), but not rapamycin (mTOR kinase inhibitor), reversed the peripheral antinociceptive effect induced by Aripiprazole. Antinociception was antagonized by the non-selective inhibitor of the nitric oxide synthase (L-NOarg). The same response was observed using the selective iNOS, but not with the selective nNOS inhibitors. The selective guanylyl cyclase enzyme inhibitor (ODQ) and the non-selective potassium channel blocker tetraethylammonium were able to reverse the antinociceptive effect of aripiprazole. The same was seen using glibenclamide, an ATP-dependent K+ channel blocker. However, calcium-activated potassium channel blockers of small and high conductance, dequalinium chloride and paxilline, respectively, did not reverse this effect. The injection of cGMP-specific phosphodiesterase type 5 inhibitor zaprinast, potentiated the antinociceptive effect induced by a low dose of aripiprazole.ConclusionThe results provide evidence that aripiprazole induces peripheral antinociceptive effects via PI3K/NO/cGMP/KATP pathway activation.© 2022 European Pain Federation - EFIC®.

17 keywords...

hide…