University of Minnesota researchers uncover early signs of Alzheimer's disease

In a significant breakthrough, researchers at the University of Minnesota have identified a new feature of Alzheimer's disease known as mitochondrial plaques. This discovery was made in both preclinical disease models and human brain tissue, suggesting that these plaques may appear earlier than the well-known beta-amyloid plaques. The findings were published in the journal Nature Neuroscience, indicating a shift in the understanding of Alzheimer's pathology. Traditionally, research has focused on beta-amyloid plaques and neurofibrillary tangles, which accumulate as the disease progresses. However, the newly identified mitochondrial plaques seem to form independently of these traditional markers and may emerge during the earliest stages of the disease. As Alzheimer's advances, these mitochondrial plaques are often found alongside beta-amyloid plaques, leading researchers to propose that they could play a role in the development of the disease's classic brain changes. Xiuli Dan, a research assistant professor and the first author of the study, emphasized the potential of these plaques as a new target for Alzheimer's treatments, given that they directly affect neurons. The implications of this discovery are profound, as it raises the possibility that Alzheimer's-related changes could begin earlier and through different biological pathways than previously recognized. Laura Bojarskaite, a neuroscientist at the University of Oslo, noted that if these findings are confirmed, they could significantly alter the understanding of how Alzheimer's begins. However, she cautioned that an early biological change does not necessarily indicate a direct cause of the disease. The study also addresses the long-standing question of mitochondrial dysfunction in Alzheimer's research. If future studies confirm that mitochondrial plaques form before traditional amyloid plaques, they could serve as biomarkers for identifying individuals at risk earlier in the disease process, potentially allowing for more effective interventions. The University of Minnesota team plans to continue their research by identifying biomarkers linked to mitochondrial plaques and screening for drugs that could prevent their accumulation. This work aims to clarify whether these newly discovered structures play a direct role in Alzheimer's disease and whether they can be targeted to slow its progression.