Role of dopaminergic system in migraine.

The theory that hypersensitivity of dopamine (DA) system is involved in the pathogenesis of migraine has been supported by various authors on the basis of clinical, pharmacological and, recently, genetic evidence. Apomorphine, a selective and specific DA agonist, has a cerebral vasodilatory effect and increases blood flow significantly in the middle cerebral artery in migraineurs. Processes from central DA neurons terminate in close contact with penetrating arterioles and cerebral capillaries in the cerebral cortex. This finding reaffirms the role of central neurogenic mechanisms in the regulation of the cerebral circulation and, we believe, further supports the major role of dopamine in the neurogenic mechanisms of migraine. Various studies have been carried out to verify the involvement of DA in migraine pathogenesis using molecular genetics as a tool. A positive association between the "dopaminergic" phenotype of migraine without aura and the D2 receptor gene has been found. To explain dopaminergic hypersensitivity in migraine without aura, we will study the genes encoding proteins involved in the signal transduction system