Abstract
Rationale
Drug combinations are commonly used in pain management, which can produce potent analgesic effects with reduced dosage and adverse effects.
Objective
This study was designed to evaluate the anti-nociceptive effects and adverse effects of new combinations of flupirtine (a Kv7 potassium channel opener) and antihistamines (promethazine, fexofenadine) on acute and chronic pain in mice, and the possible mechanisms behind the synergistic analgesic effects were preliminarily investigated.
Methods
In acetic acid writhing test, carrageenan-induced inflammatory pain model, and paclitaxel-induced neuropathic pain model, the interaction indexes (γ) between flupirtine and antihistamines were determined by isobolographic analysis. Furthermore, the Kv7 channel blocker XE991 was used to determine whether the effects of single agents and drug combinations on paclitaxel- and carrageenan-induced mechanical allodynia were mediated by Kv7 channels. Finally, hepatotoxicity markers, liver histopathology, and the rotarod test were used to investigate the adverse effects of drugs in combination doses.
Results
The interaction indexes of flupirtine-promethazine and flupirtine-fexofenadine in all the above three pain models were lower than 1. The analgesic effects of flupirtine (13 mg/kg), promethazine (5 mg/kg), fexofenadine (20 mg/kg), and their combinations were antagonized significantly by XE991 (3 mg/kg). And the adverse effects of flupirtine and antihistamines in combination doses were not significantly different from the vehicle group.
Conclusions
Flupirtine and antihistamines produced synergistic analgesic effects in all the above pain models. The analgesic effects of antihistamines were partially mediated by Kv7/M channels, and the activation of Kv7/M channels may be partly responsible for the synergistic analgesic effects between flupirtine and antihistamines.
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Acknowledgements
We are grateful for the financial support from the Scientific Research Foundation of Jiangsu Ocean University (KQ22025) and the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (2022JSPAPD006).
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Chen, Y., Xiao, X., Huang, C. et al. Flupirtine and antihistamines exert synergistic anti-nociceptive effects in mice. Psychopharmacology 240, 881–897 (2023). https://doi.org/10.1007/s00213-023-06329-3
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DOI: https://doi.org/10.1007/s00213-023-06329-3