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Brain MRI Scans Detect Early Alzheimer's Changes Years Before Symptoms

Subtle changes in brain cortex thickness, detectable via MRI, may appear up to seven years before amyloid-beta buildup linked to Alzheimer's, according to new research.

Published in Nature Neuroscience, these MRI findings are too subtle for current diagnostics but could aid in understanding early Alzheimer's stages. Alzheimer's involves protein buildup leading to brain cell death, often before cognitive symptoms.

While PET scans detect amyloid-beta, diagnosis is usually later. This study sought brain changes preceding amyloid-beta accumulation.

Researchers examined MRI scans from over a thousand participants, comparing cortical thickness between those who later developed high amyloid-beta and those who did not.

Individuals who later had high amyloid-beta levels initially showed thicker cortices. These differences, in hundredths of a millimeter, were visible up to seven years prior.

The cortex thinned with age in both groups, but less so in those destined for high amyloid-beta. No link was found between this early thickness and memory problems.

Findings suggest early cortical changes are complex, potentially involving slower thinning. Researchers hypothesize this thickening may stem from inflammation during early amyloid-beta accumulation.

Experts note these subtle changes aren't clinically diagnostic but could help researchers study Alzheimer's mechanisms and treatments, possibly clarifying how current therapies affect inflammation.

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