Summarized by Masters of Longevity from Nature Aging.
This article is a research report exploring how astrocyte-derived fibronectin links APOE4 to blood–brain barrier dysfunction in Alzheimer’s, and how targeting this pathway could restore vascular signaling.
Key Takeaways
- Blood–brain barrier (BBB) dysfunction is an early feature of Alzheimer’s disease (AD) and is particularly pronounced in individuals carrying the APOE ε4 allele, but the mechanisms linking APOE ε4 to BBB failure remain unclear.
- Here we show that astrocyte-derived fibronectin (FN1) is a key mediator of apolipoprotein E4 (APOE4)-driven BBB dysfunction in AD.
- Fibronectin accumulation is sufficient to cause BBB leakage and disrupt VEGF/HB-EGF/IGF-1 signaling through integrin-mediated focal adhesion kinase activity.
