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    Experimental models for the study of migraine - State of the art and future developments

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    The possibility to investigate the mechanisms underlying migraine attacks in reliable animal models has yielded a considerable amount of data during recent years. The interpretation, if not the understanding of the very early events that are able to trigger the cascade of events that periodically constrain a considerable number of people in miserable conditions, has allowed the identification of the anatomical structures which are involved in the process and, at least partly, the mechanisms through which these structures are activated or act. The various animal models used by the different research groups are concisely presented along with the results that the researchers have collected

    Experimental models of migraine.

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    In vitro studies on animal and human cephalic vessels allow the measurement of second messengers or intracellular calcium concentrations and the evaluation of the role of endogenous neuropeptides in perivascular nerve endings involved in migraine pathophysiology. In addition, in vitro human models allow the assessment of receptorial cranial selectivity and the collection of reliable information regarding the behavior of these vessels in migraine headache. The availability of animal models of migraine has favoured impressive advances in understanding the mechanisms and mediators underlying migraine attacks, as well as the development of new and more specific therapeutic agents. The trigeminovascular system (TVS) has emerged as a critical efferent component, and the mediators of its activity have been identified and characterized, as have some of the receptors involved. The similarity of the trigeminal innervation across species has made it possible to draw conclusions on the neurophysiological responses to electrical or chemical stimulation of the trigeminal fibers. Studies involving substances known to induce migraine-like attacks, i.e., nitric oxide (NO) donors, have provided interesting insights into the central nuclei probably involved in the initiation and repetition of migraine attacks. The neuronal and vascular effects of such substances might yield an increasing body of evidence for a better understanding of the pathophysiology of migraine attacks
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