Oggero, Silvia;
Voisin, Mathieu-Benoit;
Picco, Francesca;
Huerta, Miguel Á;
Cecconello, Chiara;
Burgoyne, Thomas;
Perretti, Mauro;
(2025)
Activation of proresolving macrophages in dorsal root ganglia attenuates persistent arthritis pain.
Proceedings of the National Academy of Sciences
, 122
(11)
, Article e2416343122. 10.1073/pnas.2416343122.
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Abstract
Pain independent of disease activity is frequently reported by rheumatoid arthritis patients and remains undertreated. Preclinical evidence suggests that imbalance of neuroimmune proresolving interactions within dorsal root ganglia (DRG) rather than at the site of inflammation plays mechanistic roles in persistent arthritis pain. Here, we inhibited production of proresolving lipid mediators by silencing 12/15-lipoxygenase expression in CX3CR1+ monocyte/macrophages conditional knockout (cKO) mice. In an arthritis model, hind paw mechanical hypersensitivity is exacerbated in male and female cKO mice in association with DRG infiltration of neutrophils, which migrate in response to leukotriene B4 released by macrophages through 5-lipoxygenase conversion of arachidonic acid provided by neuron-derived vesicles. Neutrophils apoptosis promotes primary macrophage efferocytosis which is defective in cKO macrophages. In wild-type (WT) and cKO mice, intrathecal injection of MerTK activating antibody, attenuates persistent hypersensitivity and polarizes DRG macrophages toward a proresolving phenotype with production of antinociceptive lipoxin A4. Thus, we delineate a neuron–macrophage–neutrophil bidirectional circuit that can be exploited to reduce persistent arthritis pain.
| Type: | Article |
|---|---|
| Title: | Activation of proresolving macrophages in dorsal root ganglia attenuates persistent arthritis pain |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1073/pnas.2416343122 |
| Publisher version: | https://doi.org/10.1073/pnas.2416343122 |
| Language: | English |
| Additional information: | Copyright © 2025 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Ophthalmology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10205930 |
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