ROS/TRPA1/CGRP signaling mediates cortical spreading depression

Area of Science:

• Neuroscience
• Pharmacology

Background:

• Migraine prophylaxis targets the transient receptor potential ankyrin A 1 (TRPA1) channel and calcitonin gene-related peptide (CGRP).
• Understanding the interplay of reactive oxygen species (ROS), TRPA1, and CGRP in cortical spreading depression (CSD) is crucial for migraine research.

Purpose of the Study:

• Investigate the role of TRPA1 in CSD in vivo.
• Explore the mechanisms of ROS/TRPA1/CGRP signaling in regulating cortical susceptibility to CSD.

Main Methods:

• TRPA1 expression was detected using immunohistochemistry.
• CSD was induced and monitored in rats and mouse brain slices using electrophysiology and intrinsic optical imaging.
• ROS levels were assessed via malondialdehyde (MDA) analysis.

Main Results:

• TRPA1 deactivation reduced CSD susceptibility and ipsilateral MDA levels in rats.
• In mouse slices, H2O2 facilitated CSD, an effect blocked by antioxidants and a TRPA1 antagonist.
• CGRP blockade prolonged CSD latency, reversed by H2O2 and a TRPA1 agonist.

Conclusions:

• ROS/TRPA1/CGRP signaling is critical in modulating cortical susceptibility to CSD.
• Inhibiting ROS and deactivating TRPA1 channels show therapeutic potential for stress-triggered migraine via CGRP pathways.