Raf kinase inhibitory protein reduces bradykinin receptor desensitization

Research output: Contribution to journalArticlepeer-review

Abstract

Inflammatory hyperalgesia represents a nociceptive phenotype that can become persistent in nature through dynamic protein modifications. However, a large gap in knowledge exists concerning how the integration of intracellular signaling molecules coordinates a persistent inflammatory phenotype. Herein, we demonstrate that Raf Kinase Anchoring Protein (RKIP) interrupts a vital canonical desensitization pathway to maintain bradykinin (BK) receptor activation in primary afferent neurons. Biochemical analyses of primary neuronal cultures indicate bradykinin-stimulated PKC phosphorylation of RKIP at Ser153. Furthermore, BK exposure increases G-protein Receptor Kinase 2 (GRK2) binding to RKIP, inhibiting pharmacological desensitization of the BK receptor. Additional studies found that molecular RKIP down-regulation increases BK receptor desensitization in real-time imaging of primary afferent neurons, identifying a key pathway integrator in the desensitization process that controls multiple GRK2-sensitive G-protein coupled receptors. Therefore, RKIP serves as an integral scaffolding protein that inhibits BK receptor desensitization. (Figure presented.).

Original languageEnglish (US)
Pages (from-to)156-165
Number of pages10
JournalJournal of neurochemistry
Volume162
Issue number2
DOIs
StatePublished - Jul 2022

Keywords

  • GRK2
  • PKC
  • RKIP
  • bradykinin
  • calcium

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

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