Optogenetic activation of specific engram cells reverses memory loss in Alzheimer's mouse model
Summary
MIT and Riken researchers used optogenetics to selectively activate engram cells — memory-encoding neurons identified by Arc-TRAP labeling — in 5xFAD Alzheimer's mice that had lost the ability to recall fear memories. Reactivation of engram cells restored recall to near-normal levels for 1 week, suggesting memories are stored but inaccessible rather than destroyed in early AD.
Why it matters
If Alzheimer's memory loss reflects inaccessibility rather than destruction, the therapeutic target shifts from prevention to retrieval. This paradigm shift has major implications for drug development and could validate memory-access BCIs as a therapeutic approach for early Alzheimer's patients.
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