Alzheimer’s risk gene APOE4 may have a reversible weakness — SkimNews
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- APOE4 actively damages brain blood vessels by converting pericytes into scar-producing myofibroblast-like cells, promoting vascular fibrosis and amyloid buildup, according to the September 24 Cell study.
- Mount Sinai researchers found that blocking TGF-β signaling restored pericyte coverage and reduced fibrosis and amyloid accumulation in aged APOE4 mice, demonstrating the vascular damage can be therapeutically reversed.
- The miBrain platform — 3D human brain tissue derived from induced pluripotent stem cells — was central to both studies and can be cryopreserved for reproducible, scalable disease modeling, the Cell Stem Cell study reports.
- APOE4 also caused cholesterol to accumulate inside astrocytes, disrupting their lysosomal waste-disposal system and allowing alpha-synuclein to build up and spread to neurons, the Cell Stem Cell study found.
- Alpha-synuclein buildup links APOE4 to Parkinson's and Lewy body dementia as well as Alzheimer's, and the team connected lipid metabolism and cellular waste removal as new treatment targets.
- Mount Sinai is developing patient-derived miBrains to enable personalized studies of how neurodegenerative disease develops and how individuals may respond to specific therapies.
- Alzheimer's affects more than 7 million older adults in the United States, and damage to the brain's circulation has historically been treated as a consequence of the disease rather than a driver.
Why it matters: The research reframes brain blood vessel damage as an active cause of Alzheimer's driven by APOE4 rather than a downstream consequence, and the reversal in aged APOE4 mice via TGF-β blockade gives drug developers a concrete molecular target beyond symptom management. The cryopreservable miBrain platform could shorten the path from lab discovery to patient-specific treatment testing for the 7 million Americans living with Alzheimer's.
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