Alzheimer’s Reversal Seen in Mice After Restoring Brain Energy Balance

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A new study reports a striking result in two mouse models of advanced Alzheimer’s disease: restoring the brain’s balance of NAD+, a molecule central to cellular energy and repair, reversed major signs of disease and restored cognitive function. The research also examined human Alzheimer’s brain tissue and found that disrupted NAD+ balance was associated with disease severity. The researchers used a compound called P7C3-A20 to restore NAD+ balance without simply flooding cells with excessive NAD+. In mice with established disease, treatment reversed several abnormalities linked to Alzheimer’s, including tau changes, oxidative stress, inflammation, damage to the blood-brain barrier, and impaired processes involved in making and maintaining neural connections. The treated mice also recovered performance on cognitive tests, and levels of the human Alzheimer’s biomarker p-tau217 moved toward normal levels. The work is important because most Alzheimer’s research has focused on slowing progression or preventing disease rather than reversing advanced disease. The study suggests that some brain damage associated with Alzheimer’s-like pathology may remain biologically recoverable under the right conditions. But this is still preclinical research. The strongest reversal results came from genetically engineered mouse models, not from people with Alzheimer’s disease. The study did include analyses of human brain tissue and experiments using human brain microvascular cells, but it did not demonstrate that P7C3-A20 reverses Alzheimer’s in patients. Human clinical trials are needed to determine whether the approach is safe and effective in people. The researchers also distinguish their approach from simply taking NAD+ supplements or precursors. Their method aims to restore normal cellular NAD+ balance rather than push NAD+ levels far above normal. The study therefore provides a possible therapeutic direction, not evidence that currently available NAD+ products can treat or reverse Alzheimer’s disease.