Biomedicines (Dec 2023)

Antinociceptive Effect of the Combination of a Novel α4β2* Agonist with Donepezil in a Chronic Pain Model

  • Fernanda B. de M. Monte,
  • Tadeu L. Montagnoli,
  • Bruno E. Dematté,
  • Fernanda Gubert,
  • Vitória S. Ventura,
  • Jaqueline S. da Silva,
  • Margarete M. Trachez,
  • Rosalia Mendez-Otero,
  • Gisele Zapata-Sudo

DOI
https://doi.org/10.3390/biomedicines11123249
Journal volume & issue
Vol. 11, no. 12
p. 3249

Abstract

Read online

Chronic pain presents a major challenge in contemporary medicine, given the limited effectiveness and numerous adverse effects linked to available treatments. Recognizing the potential of the cholinergic pathway as a therapeutic target, the present work evaluates the antinociceptive activity of a combination of Cris-104, a novel α4β2* receptor agonist, and donepezil, a central anticholinesterase agent. Isobolographic analysis revealed that equimolar combination was approximately 10 times more potent than theoretically calculated equipotent additive dose. Administration of Cris-104 and donepezil combination (3 μmol/kg) successfully reversed hyperalgesia and mechanical allodynia observed in rats subjected to spinal nerve ligation (SNL). The combination also modulated neuroinflammation by reducing astrocyte activation, evident in the decreased expression of glial fibrillary acidic protein (GFAP) in the spinal cord. The observed synergism in combining a nicotinic receptor agonist with an anticholinesterase agent underscores its potential for treating chronic pain. This alternative therapeutic distinct advantage, including dose reduction and high selectivity for the receptor, contribute to a more favorable profile with minimized adverse effects.

Keywords