IRAK-M attenuates pain hypersensitivity and anxiety-like behaviors in a nitroglycerin-induced chronic migraine mouse model with concomitant reductions in microglial activation and neuroinflammation.

Chronic migraine is a debilitating neurological condition involving neuroinflammation and central sensitization. This study focused on interleukin-1 receptor-associated kinase M (IRAK-M) in chronic migraine. IRAK-M is mainly found in microglia within the central nervous system. It acts as a natural regulator of immune signaling. Researchers used a mouse model with nitroglycerin injections to induce chronic migraine. They assessed pain sensitivity and anxiety-like behaviors using various tests. The study found that IRAK-M levels increased in the trigeminal nucleus caudalis following nitroglycerin administration. When IRAK-M was deficient, pain and anxiety increased significantly. Conversely, overexpressing IRAK-M reduced pain hypersensitivity and anxiety behaviors. This was linked to decreased neuroinflammation and microglial activation. Overall, IRAK-M plays a crucial role in regulating inflammation and pain in chronic migraine. The findings suggest potential pathways for developing new migraine treatments targeting IRAK-M. Clinical relevance: This research highlights IRAK-M's role in migraine pain and anxiety, suggesting new therapeutic targets.