# Modulation of Nociceptive Ion Channels by Protease-Activated Receptor-2 in Inflammatory Pain: Molecular Mechanisms and Therapeutic Potential

## TL;DR

This review explores how a receptor called PAR2 interacts with pain-related ion channels during inflammation, potentially offering new ways to treat pain.

## Contribution

The paper provides a comprehensive overview of the molecular mechanisms linking PAR2 and nociceptive ion channels in inflammatory pain.

## Key findings

- PAR2 modulates several ion channels like TRPV1, TRPV4, and ASIC3, increasing pain sensitivity during inflammation.
- The interaction between PAR2 and ion channels contributes to neuronal hyperexcitability in inflammatory conditions.
- Targeting PAR2-ion channel interactions may lead to novel therapeutic strategies for inflammatory pain.

## Abstract

Protease-activated receptor 2 (PAR2) is a G protein-coupled receptor (GPCR) expressed in both the peripheral and central nervous systems. It plays a pivotal role in mediating neuroimmune interactions, particularly in the context of inflammation and pain. Upon activation by proteases, PAR2 modulates nociception through signaling cascades that influence key ion channels, including transient receptor potential (TRP) ion channels vanilloid 1 and 4 (TRPV1 and TRPV4), ankyrin 1 (TRPA1), acid-sensing ion channel 3 (ASIC3), P2X purinoceptor 3 (P2X3), Cav3.2 (T-type Ca2+ channel), and potassium Kv7 (M-current) channels, altering their expression and function. Through this crosstalk, PAR2 contributes to heightened neuronal excitability and pain hypersensitivity in various inflammatory conditions. In this narrative review, we highlight and discuss the mechanistic and functional interplay between PAR2 and nociceptive ion channels, which might be contributing to the pathogenesis of inflammatory pain. Targeting these specific molecular interactions between PAR2 and nociceptive ion channels may offer a promising therapeutic strategy for treating inflammatory pain.