A Glra3 phosphodeficient mouse mutant establishes the critical role of protein kinase A–dependent phosphorylation and inhibition of glycine receptors in spinal inflammatory hyperalgesia
| Autor: | Elena Neumann, Hanns Ulrich Zeilhofer, Dietmar Benke, Louis Scheurer, Karolina Werynska, Jacinthe Gingras |
|---|---|
| Přispěvatelé: | University of Zurich |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Spinal Cord Dorsal Horn
Knock-in Mouse Prostaglandin 10050 Institute of Pharmacology and Toxicology Pain 610 Medicine & health Inflammation Allodynia Heat hyperalgesia Serine Mice Receptors Glycine medicine Animals Phosphorylation Protein kinase A Glycine receptor Spinal cord Chemistry Central sensitization Dis-inhibition Dorsal horn von Frey Hargreaves test Cyclic AMP-Dependent Protein Kinases Cell biology Anesthesiology and Pain Medicine Nociception medicine.anatomical_structure Neurology Hyperalgesia 570 Life sciences biology Neurology (clinical) medicine.symptom Research Paper |
| Zdroj: | Pain, 162 (9) Pain |
| DOI: | 10.3929/ethz-b-000507965 |
| Popis: | Supplemental Digital Content is Available in the Text. Behavioral and electrophysiological experiments show that a single point mutation in the glycine receptor α3 subunit protects mice from the hyperalgesic actions of spinal prostaglandin E2. Glycinergic neurons and glycine receptors (GlyRs) exert a critical control over spinal nociception. Prostaglandin E2 (PGE2), a key inflammatory mediator produced in the spinal cord in response to peripheral inflammation, inhibits a certain subtype of GlyRs (α3GlyR) that is defined by the inclusion of α3 subunits and distinctly expressed in the lamina II of the spinal dorsal horn, ie, at the site where most nociceptive nerve fibers terminate. Previous work has shown that the hyperalgesic effect of spinal PGE2 is lost in mice lacking α3GlyRs and suggested that this phenotype results from the prevention of PGE2-evoked protein kinase A (PKA)-dependent phosphorylation and inhibition of α3GlyRs. However, direct proof for a contribution of this phosphorylation event to inflammatory hyperalgesia was still lacking. To address this knowledge gap, a phospho-deficient mouse line was generated that carries a serine to alanine point mutation at a strong consensus site for PKA-dependent phosphorylation in the long intracellular loop of the GlyR α3 subunit. These mice showed unaltered spinal expression of GlyR α3 subunits. In behavioral experiments, they showed no alterations in baseline nociception, but were protected from the hyperalgesic effects of intrathecally injected PGE2 and exhibited markedly reduced inflammatory hyperalgesia. These behavioral phenotypes closely recapitulate those found previously in GlyR α3-deficient mice. Our results thus firmly establish the crucial role of PKA-dependent phosphorylation of α3GlyRs in inflammatory hyperalgesia. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|