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CADASIL mutations sensitize the brain to ischemia via spreading depolarizations and abnormal extracellular potassium homeostasis

Abstract : Cerebral autosomal dominant arteriopathy, subcortical infarcts and leukoencephalopathy (CADASIL) is the most common monogenic form of small vessel disease characterized by migraine with aura, leukoaraiosis, strokes and dementia. CADASIL mutations cause cerebrovascular dysfunction in both animal models and humans. Here, we show that two different human CADASIL mutations (Notch3 R90C or R169C) worsen ischemic stroke outcomes in transgenic mice, explained by a higher blood flow threshold to maintain tissue viability. Both mutants developed larger infarcts and worse neurological deficits compared with wild type regardless of age or sex after filament middle cerebral artery occlusion. However, full-field laser speckle flowmetry during distal middle cerebral artery occlusion showed comparable perfusion deficits in mutants and their respective wild type controls. Circle of Willis anatomy and pial collateralization also did not differ among the genotypes. In contrast, mutants had a higher cerebral blood flow threshold below which infarction ensued, suggesting increased sensitivity of brain tissue to ischemia. Electrophysiological recordings revealed a 1.5-to 2fold higher frequency of peri-infarct spreading depolarizations in CADASIL mutants. Higher extracellular K + elevations during spreading depolarizations in the mutants implicated a defect in extracellular K + clearance. Altogether, these data reveal a novel mechanism of enhanced vulnerability to ischemic injury linked to abnormal extracellular ion homeostasis and susceptibility to ischemic depolarizations in CADASIL.
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https://www.hal.inserm.fr/inserm-03625838
Contributor : Clara Martinez Rico Connect in order to contact the contributor
Submitted on : Thursday, March 31, 2022 - 10:22:22 AM
Last modification on : Thursday, April 7, 2022 - 1:58:22 PM
Long-term archiving on: : Friday, July 1, 2022 - 7:09:11 PM

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Fumiaki Oka, Jeong Hyun Lee, Izumi yuzawa, Mei Li, Daniel von Bornstaedt, et al.. CADASIL mutations sensitize the brain to ischemia via spreading depolarizations and abnormal extracellular potassium homeostasis. The Journal of clinical investigation, 2022, Online ahead of print. ⟨10.1172/jci149759⟩. ⟨inserm-03625838⟩

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