Abstract
Objective and design
Our aim was to determine an age-dependent role of Nav1.8 and ASIC3 in dorsal root ganglion (DRG) neurons in a rat pre-clinical model of long-term inflammatory pain.
Methods
We compared 6 and 24 months-old female Wistar rats after cutaneous inflammation. We used behavioral pain assessments over time, qPCR, quantitative immunohistochemistry, selective pharmacological manipulation, ELISA and in vitro treatment with cytokines.
Results
Older rats exhibited delayed recovery from mechanical allodynia and earlier onset of spontaneous pain than younger rats after inflammation. Moreover, the expression patterns of Nav1.8 and ASIC3 were time and age-dependent and ASIC3 levels remained elevated only in aged rats. In vivo, selective blockade of Nav1.8 with A803467 or of ASIC3 with APETx2 alleviated mechanical and cold allodynia and also spontaneous pain in both age groups with slightly different potency. Furthermore, in vitro IL-1β up-regulated Nav1.8 expression in DRG neurons cultured from young but not old rats. We also found that while TNF-α up-regulated ASIC3 expression in both age groups, IL-6 and IL-1β had this effect only on young and aged neurons, respectively.
Conclusion
Inflammation-associated mechanical allodynia and spontaneous pain in the elderly can be more effectively treated by inhibiting ASIC3 than Nav1.8.
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Data availability
The data that support the findings of this study are available from authors upon reasonable request.
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Acknowledgements
DNM and EDP: were supported by doctoral fellowships from the National Research Council of Argentina (CONICET). CGA is a Staff Scientist of the same organization. This work was funded by Fondo Nacional para la Ciencia y la Tecnología (FONCyT-ANPCyT PICT-2019-02666 to CGA), Proyecto de Financiamiento de Unidades Ejecutoras (PUE-2017-0025 to CGA) and by the Proyectos de Investigación Plurianual 2021–2023 (PIP-2230 to CGA). The sponsors of this research were not involved in the experimental design, writing of the manuscript or the decision to submit it. We thank Sean Patterson (IHEM-CONICET) for critical reading and editing of the manuscript.
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Conceptualization: D.N.M & C.G.A.; Methodology: D.N.M., E.D.P. & C.G.A.; Formal analysis and investigation: D.N.M., E.D.P. & C.G.A.; Writing—original draft preparation: D.N.M. & C.G.A.; Writing—review and editing: D.N.M., E.D.P. & C.G.A.; Funding acquisition: C.G.A.; Supervision: C.G.A.
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Messina, D.N., Peralta, E.D. & Acosta, C.G. Complex alterations in inflammatory pain and analgesic sensitivity in young and ageing female rats: involvement of ASIC3 and Nav1.8 in primary sensory neurons. Inflamm. Res. 73, 669–691 (2024). https://doi.org/10.1007/s00011-024-01862-z
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DOI: https://doi.org/10.1007/s00011-024-01862-z