CADASIL-associated Notch3 mutations have differential effects both on ligand binding and ligand-induced Notch3 receptor signaling through RBP-Jk

Experimental Cell Research
Nils PetersMartin Dichgans

Abstract

Mutations in the NOTCH3 gene are the cause of cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL), a hereditary angiopathy leading to strokes and dementia. Pathogenic mutations remove or insert cysteine residues within epidermal growth factor (EGF) repeats in the extracellular domain of the Notch3 receptor (N3ECD). Vascular smooth muscle cells (VSMC) are the predominant site of Notch3 expression in adults. In CADASIL patients, VSMC degenerate and N3ECD is deposited within the vasculature. However, the mechanisms underlying VSMC degeneration and N3ECD accumulation are still unknown. In this study, we investigated the consequences of three pathogenic Notch3 mutations on the biological activity of the receptor by analyzing ligand (Delta-/Jagged-)-induced signaling via RBP-Jk. Two mutations (R133C and C183R) that are located outside the putative ligand binding domain (LBD) of the receptor were found to result in normal Jagged1-induced signaling in A7r5 VSMC, whereas the third mutation (C455R located within the putative LBD) showed strongly reduced signaling activity. Ligand binding assays with soluble Delta1 and Jagged1 revealed that C455R interferes with ligand binding through disru...Continue Reading

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