An Rnf213-deficient hypoperfusion model reveals Moyamoya-relevant neurovascular remodeling

Area of Science:

• Neuroscience
• Genetics
• Vascular Biology

Background:

• Moyamoya disease (MMD) is a cerebrovascular disorder with progressive stenosis of brain arteries.
• RNF213 is a major MMD susceptibility gene, but its low penetrance suggests environmental interactions are crucial.
• Patients with MMD show common carotid artery (CCA) stenosis, linked to altered cerebral blood flow.

Purpose of the Study:

• To investigate the synergistic effect of RNF213 deficiency and CCA stenosis in MMD pathogenesis.
• To establish and characterize a novel mouse model mimicking MMD features.

Main Methods:

• Created a mouse model with Rnf213 knockout and bilateral CCA stenosis.
• Analyzed hypoperfusion-induced neurovascular remodeling, including hemorrhage, infarction, and microvessel proliferation.
• Investigated the mechanistic role of RNF213 knockdown in endothelial cell behavior under stress.

Main Results:

• The Rnf213 knockout and CCA stenosis mouse model displayed MMD-relevant features like cerebral hemorrhage and infarction.
• Hypoperfusion stress in these mice led to significant neurovascular remodeling.
• RNF213 deficiency sensitized cerebral vessels to hypoperfusion and promoted endothelial cell migration and proliferation.

Conclusions:

• RNF213 deficiency combined with mild CCA stenosis and hypoperfusion stress can induce MMD-like pathology.
• This study provides insights into the complex interplay of genetic and environmental factors in MMD.
• The developed mouse model is valuable for studying MMD pathogenesis and therapeutic strategies.