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Apoptosis signal-regulating kinase 1 is a novel target molecule for cognitive impairment induced by chronic cerebral hypoperfusion.

Authors: Toyama, K  Koibuchi, N  Uekawa, K  Hasegawa, Y  Kataoka, K  Katayama, T  Sueta, D  Ma, MJ  Nakagawa, T  Yasuda, O  Tomimoto, H  Ichijo, H  Ogawa, H  Kim-Mitsuyama, S 
Citation: Toyama K, etal., Arterioscler Thromb Vasc Biol. 2014 Mar;34(3):616-25. doi: 10.1161/ATVBAHA.113.302440. Epub 2013 Dec 26.
Pubmed: (View Article at PubMed) PMID:24371084
DOI: Full-text: DOI:10.1161/ATVBAHA.113.302440

OBJECTIVE: There are currently no specific strategies for the treatment or prevention of vascular dementia. White matter lesions, a common pathology in cerebral small vessel disease, are a major cause of vascular dementia. We investigated whether apoptosis signal-regulating kinase 1 (ASK1) might be a key molecule in cerebral hypoperfusion, associated with blood-brain barrier breakdown and white matter lesions. APPROACH AND RESULTS: A mouse model of cognitive impairment was developed by inducing chronic cerebral hypoperfusion in white matter including the corpus callosum via bilateral common carotid artery stenosis (BCAS) surgery. BCAS-induced white matter lesions caused cognitive decline in C57BL/6J (wild-type) mice but not in ASK1-deficient (ASK1(-/-)) mice. Phosphorylated ASK1 increased in wild-type mouse brains, and phosphorylated p38 and tumor necrosis factor-alpha expression increased in corpus callosum cerebral endothelial cells after BCAS in wild-type mice but not in ASK1(-/-) mice. BCAS decreased claudin-5 expression and disrupted blood-brain barrier in the corpus callosum of wild-type but not ASK1(-/-) mice. Cerebral nitrotyrosine was increased in wild-type and ASK1(-/-) BCAS mice. Cerebral phosphorylated ASK1 did not increase in wild-type mice treated with NADPH-oxidase inhibitor. A p38 inhibitor and NADPH-oxidase inhibitor mimicked the protective effect of ASK1 deficiency against cognitive impairment. Specific ASK1 inhibitor prevented cognitive decline in BCAS mice. In vitro oxygen-glucose deprivation and tumor necrosis factor-alpha stimulation caused the disruption of endothelial tight junctions from wild-type mice but not ASK1(-/-) mice. CONCLUSIONS: Oxidative stress-ASK1-p38 cascade plays a role in the pathogenesis of cognitive impairment, through blood-brain barrier breakdown via the disruption of endothelial tight junctions. ASK1 might be a promising therapeutic target for chronic cerebral hypoperfusion-induced cognitive impairment.

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CRRD Object Information
CRRD ID: 10412307
Created: 2015-11-16
Species: All species
Last Modified: 2015-11-16
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.