Why targeting a single protein hasn't cured Alzheimer’s disease

Science · Published 14 October 2026 Swipe more like this →

In short: For decades, researchers have focused on amyloid-beta as the primary culprit of Alzheimer's. Yet, drugs targeting this single factor have consistently fallen short. We may be looking at the wrong map entirely, as new evidence suggests the disease is a complex system rather than a single biological error.

The prevailing hypothesis regarding the origins of Alzheimer’s disease is being challenged by researchers who suggest that viruses could potentially be involved in its onset. This shift in perspective moves away from purely internal protein malfunctions toward external biological triggers, though this remains an emerging area of inquiry. Because current research has struggled to produce a definitive cure, these alternative theories are gaining significant attention.

The primary reason for the limited success of previous treatments is the disease's inherent complexity. While amyloid-beta (Aβ) buildup has been a central target, it is only one piece of a tangled mix. Scientists now emphasize that Alzheimer's arises from the combined effects of Aβ, Tau protein tangles—specifically Tau hyperphosphorylation—genetic risk factors like APOE ε4, and general aging-related changes such as declining mitochondrial function and increased DNA damage.

Because these factors are interconnected, experts like Professor Yan-Jiang Wang argue that a multi-pronged strategy is required. This includes moving beyond single-protein drugs toward gene editing (CRISPR/Cas9), brain-cell rejuvenation, and even gut health interventions. Specifically, 'senolytic' therapies are being explored to remove aging glial cells to improve brain health. The goal is to treat Alzheimer’s as a systemic failure of the body rather than an isolated neurological problem.

While recent monoclonal antibodies like lecanemab and donanemab have shown some optimism by slowing cognitive decline, they do not reverse the disease or restore normal function. This highlights the necessity of coordinated approaches that address whole-body health and genetic variants simultaneously to achieve meaningful clinical outcomes.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

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