“…First, pharmacological agents interacting with serotonin (5-HT) and/or its receptors are highly Neuropsychiatric Genetics effective in acute and prophylactic migraine treatment [The Subcutaneous Sumatriptan International Study Group, 1991;Hargreaves, 2007]. In addition, drugs known to facilitate 5-HT release are able to induce migraine attacks [Panconesi and Sicuteri, 1997] and low 5-HT blood levels predispose to cortical spreading depression (CSD) in rats [Supornsilpchai et al, 2006], the suggested upstream event of a migraine attack, particularly in MA [Moskowitz, 2007]. Although there is controversy, most studies point toward altered 5-HT levels in migraine patients both during attacks and interictally [Ferrari and Saxena, 1993;Hamel, 2007] and suggest that reduced 5-HT availability could be a fundamental event in migraine pathophysiology.…”