Abstract
Remote damage is a secondary phenomenon that usually occurs after a primary brain damage in regions that are distant, yet functionally connected, and that is critical for determining the outcomes of several CNS pathologies, including traumatic brain and spinal cord injuries. The understanding of remote damage-associated mechanisms has been mostly achieved in several models of focal brain injury such as the hemicerebellectomy (HCb) experimental paradigm, which helped to identify the involvement of many key players, such as inflammation, oxidative stress, apoptosis and autophagy. Currently, few interventions have been shown to successfully limit the progression of secondary damage events and there is still an unmet need for new therapeutic options. Given the emergence of the novel concept of resolution of inflammation, mediated by the newly identified ω3-derived specialized pro-resolving lipid mediators, such as resolvins, we reported a reduced ability of HCb-injured animals to produce resolvin D1 (RvD1) and an increased expression of its target receptor ALX/FPR2 in remote brain regions. The in vivo administration of RvD1 promoted functional recovery and neuroprotection by reducing the activation of Iba-1+ microglia and GFAP+ astrocytes as well as by impairing inflammatory-induced neuronal cell death in remote regions. These effects were counteracted by intracerebroventricular neutralization of ALX/FPR2, whose activation by RvD1 also down-regulated miR-146b- and miR-219a-1-dependent inflammatory markers. In conclusion, we propose that innovative therapies based on RvD1-ALX/FPR2 axis could be exploited to curtail remote damage and enable neuroprotective effects after acute focal brain damage.
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Abbreviations
- GFAP:
-
Glial fibrillary acidic protein
- HCb:
-
Hemicerebellectomy
- Rv:
-
Resolvin
- RvD1:
-
Resolvin D1
- SPM:
-
Specialized pro-resolving mediators
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This work was funded by Fondazione Italiana Sclerosi Multipla (FISM) (grant 2015/R/8 to V.C.) and by the Italian Ministry of Health (Progetto Giovani Ricercatori Project Code GR-2010.2310524 to M.T.V.).
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Maria Teresa Viscomi and Valerio Chiurchiù equally senior authors
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Bisicchia, E., Sasso, V., Catanzaro, G. et al. Resolvin D1 Halts Remote Neuroinflammation and Improves Functional Recovery after Focal Brain Damage Via ALX/FPR2 Receptor-Regulated MicroRNAs. Mol Neurobiol 55, 6894–6905 (2018). https://doi.org/10.1007/s12035-018-0889-z
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DOI: https://doi.org/10.1007/s12035-018-0889-z