Microglia-mediated degradation of perineuronal nets promotes pain

Author:

Tansley Shannon12ORCID,Gu Ning1ORCID,Guzmán Alba Ureña1,Cai Weihua1,Wong Calvin1ORCID,Lister Kevin C.1ORCID,Muñoz-Pino Einer3ORCID,Yousefpour Noosha4ORCID,Roome R. Brian5,Heal Jordyn1ORCID,Wu Neil1ORCID,Castonguay Annie3ORCID,Lean Graham6ORCID,Muir Elizabeth M.7,Kania Artur58,Prager-Khoutorsky Masha6ORCID,Zhang Ji91011ORCID,Gkogkas Christos G.12ORCID,Fawcett James W.1314ORCID,Diatchenko Luda11011ORCID,Ribeiro-da-Silva Alfredo4811ORCID,De Koninck Yves3411ORCID,Mogil Jeffrey S.1211ORCID,Khoutorsky Arkady11011ORCID

Affiliation:

1. Department of Anesthesia, McGill University, Montreal, QC, Canada.

2. Department of Psychology, Faculty of Science, McGill University, Montreal, QC, Canada.

3. Department of Psychiatry and Neuroscience, CERVO Brain Research Centre, Université Laval, Québec, QC, Canada.

4. Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada.

5. Institut de Recherches Cliniques de Montreal (IRCM), Montreal, QC, Canada.

6. Department of Physiology, McGill University, Montreal, QC, Canada.

7. Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, UK.

8. Department of Anatomy and Cell Biology, McGill University, Montreal, QC, Canada.

9. Department of Neurology and Neurosurgery, McGill University, Montreal, QC, Canada.

10. Faculty of Dental Medicine and Oral Health Sciences, Montreal, QC, Canada.

11. Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, Canada.

12. Biomedical Research Institute, Foundation for Research and Technology-Hellas, University Campus, 45110 Ioannina, Greece.

13. John van Geest Centre for Brain Repair, Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK.

14. Centre for Reconstructive Neuroscience, Institute for Experimental Medicine CAS, Prague, Czech Republic.

Abstract

Activation of microglia in the spinal cord dorsal horn after peripheral nerve injury contributes to the development of pain hypersensitivity. How activated microglia selectively enhance the activity of spinal nociceptive circuits is not well understood. We discovered that after peripheral nerve injury, microglia degrade extracellular matrix structures, perineuronal nets (PNNs), in lamina I of the spinal cord dorsal horn. Lamina I PNNs selectively enwrap spinoparabrachial projection neurons, which integrate nociceptive information in the spinal cord and convey it to supraspinal brain regions to induce pain sensation. Degradation of PNNs by microglia enhances the activity of projection neurons and induces pain-related behaviors. Thus, nerve injury–induced degradation of PNNs is a mechanism by which microglia selectively augment the output of spinal nociceptive circuits and cause pain hypersensitivity.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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