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- W2195871191 abstract "Objective CADASIL is a genetic paradigm of cerebral small vessel disease caused by NOTCH3 mutations that stereotypically lead to the extracellular deposition of NOTCH3 ectodomain (Notch3 ECD ) on the vessels. TIMP3 and vitronectin are 2 extracellular matrix proteins that abnormally accumulate in Notch3 ECD ‐containing deposits on brain vessels of mice and patients with CADASIL. Herein, we investigated whether increased levels of TIMP3 and vitronectin are responsible for aspects of CADASIL disease phenotypes. Methods Timp3 and vitronectin expression were genetically reduced in TgNotch3 R169C mice, a well‐established preclinical model of CADASIL. A mouse overexpressing human TIMP3 ( TgBAC‐TIMP3 ) was developed. Disease‐related phenotypes, including cerebral blood flow (CBF) deficits, white matter lesions, and Notch3 ECD deposition, were evaluated between 6 and 20 months of age. Results CBF responses to neural activity (functional hyperemia), topical application of vasodilators, and decreases in blood pressure (CBF autoregulation) were similarly reduced in TgNotch3 R169C and TgBAC‐TIMP3 mice, and myogenic responses of brain arteries were likewise attenuated. These defects were rescued in TgNotch3 R169C mice by haploinsufficiency of Timp3 , although the number of white matter lesions was unaffected. In contrast, haploinsufficiency or loss of vitronectin in TgNotch3 R169C mice ameliorated white matter lesions, although CBF responses were unchanged. Amelioration of cerebrovascular reactivity or white matter lesions in these mice was not associated with reduced Notch3 ECD deposition in brain vessels. Interpretation Elevated levels of TIMP3 and vitronectin, acting downstream of Notch3 ECD deposition, play a role in CADASIL, producing divergent influences on early CBF deficits and later white matter lesions. ANN NEUROL 2016;79:387–403" @default.
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- W2195871191 date "2016-02-10" @default.
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- W2195871191 title "Reducing <scp>T</scp>imp3 or vitronectin ameliorates disease manifestations in <scp>CADASIL</scp> mice" @default.
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- W2195871191 doi "https://doi.org/10.1002/ana.24573" @default.
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