GoKawiilStudy maps 92 blood proteins that cross the blood–brain barrier to support brain health
Researchers led by neuroscientist Andrew Yang at the Gladstone Institute of Neurological Disease developed a labeling technique to track nearly 900 blood proteins and identified 92 that cross into the brain, many originating in organs like the liver. The team focused on apolipoprotein A1 (APOA1), which prompts astrocytes to release cholesterol needed for synapse maintenance, and found two receptors, SR-B1 and ABCA1, that help ferry it across the barrier. In mice modeling early Alzheimer's disease, this protein transport system broke down.
GoKawiil's interpretation of the reporting above, not reported fact.
The findings challenge the long-held view that the blood-brain barrier is normally sealed and only becomes 'leaky' once Alzheimer's takes hold; Yang suggests instead that the barrier actively imports proteins the brain needs, and that losing this supply may help drive early disease dysfunction. If confirmed, this could reframe how researchers think about early intervention, potentially pointing toward therapies that restore protein transport rather than simply treating leakage as damage.
- Scientists identified 92 blood proteins, including APOA1, that normally cross the blood-brain barrier to support brain function.
- Receptors SR-B1 and ABCA1 appear to help transport APOA1 from blood into brain cells called astrocytes.
- This transport process broke down in mice modeling early-stage Alzheimer's disease, suggesting a possible new mechanism in disease onset.
Source: nature.com — Basu, 2026-11-11
Published there as: “New culprit in early Alzheimer’s: Blood–brain barrier blocks protective proteins”
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