Alzheimer's timeline shows changes start as trickle, become torrent


Originally published by Jon Hamilton at npr.org, on November 11, 2024

A study of cells from 84 cadaver brains suggests that Alzheimer's has two distinct phases, and that one type of neuron is especially vulnerable.


Scientists have found one type of neuron is affected early in Alzheimer's.koto_feja/Getty Images/E+

"There's an early phase where there's a very slow increase in the amount of pathology," says Ed Lein, a senior investigator at the Allen Institute for Brain Science in Seattle, "then a more exponential phase where suddenly things get really bad."

The study also found evidence that a small subset of neurons known as somatostatin inhibitory neurons begin to die off during the early phase of Alzheimer's, Lein and a team of nearly 100 other scientists report in the journal Nature Neuroscience.

"That was quite a surprise," Lein says, because these neurons have received relatively little attention from Alzheimer's researchers.

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