Dopaminergic Dysregulation in Migraine: From Hypothalamic A11 Dysfunction to a Systemic Biobehavioral Phenotype.

Beyond the well-established roles of serotonin and calcitonin gene-related peptide (CGRP), the contribution of dopamine (DA) to migraine pathophysiology remains a subject of intense investigation. DA acts as a neuromodulator, functioning both as a homeostatic pain filter and a driver of premonitory and autonomic symptoms. This review provides a comprehensive synthesis of DA's involvement in migraine, proposing an integrated model that spans from molecular signaling to a systemic phenotype. A comprehensive search of the PubMed database (1976-2026) was performed. The analysis evaluates data across receptor signaling, hypothalamic connectivity (specifically the A11 nucleus), genetic susceptibility markers and advanced neuroimaging studies. Current evidence identifies dopamine as a gatekeeper of the trigeminovascular threshold, with the hypothalamic A11 nucleus serving as a modulatory hub. Within this circuit, DA exerts concentration-dependent effects: high-affinity D2 receptor activation promotes antinociception, whereas low-affinity D1-like receptors facilitate nociceptive signaling. Clinically, this manifests as a "dopaminergic phenotype" characterized by yawning, nausea, and reward-system dysfunction. This phenotype extends beyond migraine, showing links to comorbidities such as restless legs syndrome (RLS) and attention-deficit/hyperactivity disorder (ADHD). DA's role in migraine is state-dependent and interconnected with CGRP and serotonergic pathways. Recognizing the dopaminergic phenotype is essential for capturing the clinical heterogeneity of the disorder and may pave the way for personalized, mechanism-based therapeutic strategies.