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Patient-Specific iPSC Model of a Genetic Vascular Dementia Syndrome Reveals Failure of Mural Cells to Stabilize Capillary Structures

Research output: Contribution to journalArticle

Joseph Kelleher, Adam Dickinson, Stuart Cain, Yanhua Hu, Nicola Bates, Adam Harvey, Jianzhen Ren, Wenjun Zhang, Fiona C. Moreton, Keith W. Muir, Christopher Ward, Rhian M. Touyz, Pankaj Sharma, Qingbo Xu, Susan J. Kimber, Tao Wang

Original languageEnglish
Pages (from-to)817-831
Number of pages15
JournalStem cell reports
Volume13
Issue number5
DOIs
Publication statusPublished - 12 Nov 2019

King's Authors

Abstract

CADASIL (cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy) is the most common form of genetic stroke and vascular dementia syndrome resulting from mutations in NOTCH3. To elucidate molecular mechanisms of the condition and identify drug targets, we established a patient-specific induced pluripotent stem cell (iPSC) model and demonstrated for the first time a failure of the patient iPSC-derived vascular mural cells (iPSC-MCs) in engaging and stabilizing endothelial capillary structures. The patient iPSC-MCs had reduced platelet-derived growth factor receptor β, decreased secretion of the angiogenic factor vascular endothelial growth factor (VEGF), were highly susceptible to apoptotic insults, and could induce apoptosis of adjacent endothelial cells. Supplementation of VEGF significantly rescued the capillary destabilization. Small interfering RNA knockdown of NOTCH3 in iPSC-MCs revealed a gain-of-function mechanism for the mutant NOTCH3. These disease mechanisms likely delay brain repair after stroke in CADASIL, contributing to the brain hypoperfusion and dementia in this condition, and will help to identify potential drug targets.

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