Abstract
Recent animal experiments have shown that chronic medication exposure profoundly affects the function of several areas in the nervous system related to headache pathogenesis. These changes include upregulation of calcitonin gene–related peptide, substance P, and nitric oxide synthase in trigeminal ganglia; expansion of receptive field and decreased nociceptive threshold of central trigeminal neurons; decrease in diffuse noxious inhibitory control; and increased susceptibility to develop cortical spreading depression (CSD). These changes indicate an increase in excitability of cortical and trigeminal neurons. The neuronal hyperexcitability may be the result of derangement of a central, possibly serotonin (5-HT)-dependent, modulating control system. Experiments with animals with low 5-HT showed that the processes of CSD and trigeminal nociception are enhanced in this condition. Derangement in the central 5-HT–dependent modulating system as a result of chronic medication use may underlie the chronification of headache as observed in patients with medication-overuse headache.
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Acknowledgements
This study was supported by the Neuroscience of Headache Research Unit, the Thailand Research Fund (RTA5180004 and MRG5280061) and the Ratchadapiseksompotch Fund from the Faculty of Medicine, Chulalongkorn University.
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Bongsebandhu-phubhakdi, S., Srikiatkhachorn, A. Pathophysiology of Medication-overuse Headache: Implications from Animal Studies. Curr Pain Headache Rep 16, 110–115 (2012). https://doi.org/10.1007/s11916-011-0234-y
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DOI: https://doi.org/10.1007/s11916-011-0234-y