Why do memories fade in Alzheimer’s disease – and can they be restored?

University of California, Irvine researchers have uncovered a key mechanism underlying memory loss, showing for the first time that dopamine dysfunction in the entorhinal cortex, a critical memory-related brain region, contributes directly to impaired memory formation.

The study, published today in Nature Neuroscience, identifies a previously unrecognized role for dopamine in Alzheimer’s-related cognitive decline and points to potential therapeutic strategies using existing drugs such as Levodopa.

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An estimated 7.4 million Americans age 65 and older are now living with clinical dementia due to Alzheimer’s disease, according to a newly released report from the Alzheimer’s Association.
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Three scientists taking varied approaches to understanding Alzheimer’s discuss what it will take to move the field forward

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Researchers at the University of California San Diego have uncovered new insights into one of Alzheimer’s disease’s most puzzling questions: why some older adults remain mentally sharp despite having hallmark brain changes linked to the disease. This condition—known as asymptomatic Alzheimer’s disease (AsymAD )—has long been observed but poorly understood. Decoding this natural resilience could pave the way for earlier detection and new strategies to prevent memory loss before symptoms begin. The work is published in the journal Acta Neuropathologica Communications.

“Even when the brain shows clear signs of Alzheimer’s, some people stay mentally sharp,” said co-senior author Sushil K. Mahata, Ph.D., adjunct professor of medicine at UC San Diego School of Medicine and research physiologist at the VA San Diego Healthcare System. “We’re beginning to uncover the brain’s built-in defenses—and that could fundamentally change how we approach treatment.”

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