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A new study points to stress granules — tiny clusters of protein and RNA that form in cells under genetic or environmental pressure — as a possible trigger for Alzheimer’s, offering fresh hope for early treatments.
A team at Arizona State University argues that these stress granules are a primary cause of Alzheimer’s disease.
The researchers analyzed data from multiple medical databases and earlier studies, including a 2022 analysis of Alzheimer’s progression, to find common changes in gene expression tied to the illness.
Alzheimer’s causes major shifts in cells long before memory loss shows up, reshaping biological pathways. That leads to increased cellular stress, loss of neural connections, and protein problems like beta-amyloid buildup. But scientists still don’t fully understand what sets off those changes in gene activity, ScienceAlert reported.
Normally, stress granules protect cells. But in Alzheimer’s disease they can linger and interfere with other processes—especially nucleocytoplasmic transport, the movement of molecules between the nucleus and the cytoplasm through nuclear pores.
“Our hypothesis about this disruption in the connection between the nucleus and cytoplasm, leading to severe gene expression disturbances, provides a plausible basis for a comprehensive understanding of the mechanisms underlying this complex disease,” said Paul Coleman, the study’s lead author. He added, “Studying the early manifestations of Alzheimer’s disease could pave the way for innovative approaches to diagnosis, treatment, and prevention.”
The hypothesis holds that stress granules jam the cell’s transport system and alter gene expression. That change then opens the door to typical Alzheimer’s problems, such as neuroinflammation and tangles of tau protein. In other words, several aspects of Alzheimer’s may trace back to one source.
Because this cellular stress appears before symptoms emerge, researchers may be able to intervene early and block the disease. It’s possible many symptoms could be prevented from the start.
Many factors—from air pollution to genetic mutations—might cause stress granules to persist. Future work will need to clarify how these granules form and exactly how they cause harm.
“Our study contributes to the ongoing discussion about when Alzheimer’s disease actually begins; this is a concept evolving with advancements in technology. Key questions include when the disease can be detected and when intervention should start. Both of these questions have profound implications for society and future medical approaches,” Coleman said.
The findings were published in the journal Alzheimer’s and Dementia: The Journal of the Alzheimer’s Association.
