CSD, BBB and MMP-9 elevations: animal experiments versus clinical phenomena in migraine.

Abstract:

:Cortical spreading depression (CSD) has been at the center stage of migraine pathophysiology for approximately six decades. Reanalysis of CSD reveals several major unbridgeable gaps in this experimental neurophysiologic concept for migraine. Key phenotypic and pharmacological features of migraine challenge the assumed pathophysiologic role of CSD. Detection of subclinical infarct-like white matter lesions (WMLs) in the brain of some migraine patients stimulated the concept of CSD-related BBB disruption. Raised plasma levels of matrix metalloproteinases (MMPs) in migraine patients in the headache phase, specifically MMP-9, suggested a pathogenetic role for MMP elevation in the development of both migraine attacks and WMLs. Migraine attacks with or without aura present a unique, profound and protracted vasodilatory challenge to the homeostatic systems of the brain. To accommodate the rather sudden increase in cerebral blood flow, the brain circulatory network must dilate and the BBB must expand considerably. MMPs can influence expansion of the extracellular matrix of the BBB and loosening of the intercellular tight junctions between endothelial cells through proteolytic degradation during migrainous cerebrovascular dilatation. WMLs most probably reflect transient and discrete breakdown of the BBB consequent to sustained cerebral hyperperfusion rather than hypoperfusion. Systemic elevations of MMPs are not specific to migraine but are found in a variety of neurological and extra-neurological disorders. This perspective presents a conceptual dissociation between the effects of CSD on the brain of experimental animals and the clinical phenomena in migraine patients.

journal_name

Expert Rev Neurother

authors

Gupta VK

doi

10.1586/ern.09.103

subject

Has Abstract

pub_date

2009-11-01 00:00:00

pages

1595-614

issue

11

eissn

1473-7175

issn

1744-8360

journal_volume

9

pub_type

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