Astrocytes Show Promise in Clearing Alzheimer’s Plaques,Preserving Cognitive Function
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A new study reveals a natural brain mechanism involving astrocytes – star-shaped brain cells – that clears toxic amyloid plaques associated with Alzheimer’s disease and protects cognitive abilities,offering a potential new therapeutic avenue.
researchers at Baylor College of Medicine have identified a protein, Sox9, that plays a crucial role in enabling astrocytes to effectively remove amyloid plaques. This suggests that bolstering the brain’s natural cleanup processes could be as crucial as preventing plaque formation in the fight against neurodegenerative diseases.
The Brain’s Natural Cleanup Crew
astrocytes are increasingly recognized for their multifaceted roles in brain health. “astrocytes perform diverse tasks that are essential for normal brain function, including facilitating brain communications and memory storage,” explained a senior researcher involved in the study. “As the brain ages, astrocytes show profound functional alterations; however, the role these alterations play in aging and neurodegeneration is not yet understood.”
The team focused on Sox9,a key regulator of astrocyte function,to understand its role in both aging and Alzheimer’s. By manipulating Sox9 expression in mouse models of Alzheimer’s, they observed dramatic effects on plaque clearance and cognitive performance.
Sox9: A Key to Astrocytic Function
The researchers specifically utilized mouse models that already exhibited cognitive impairment and amyloid plaque buildup – a design choice intended to more closely mirror the condition of many Alzheimer’s patients. “An important point of our experimental design is that we worked with mouse models of Alzheimer’s disease that had already developed cognitive impairment… We believe these models are more relevant to what we see in many patients,” stated a lead author of the study.
Over a six-month period, the team either increased or eliminated Sox9 production in these mice, then assessed their cognitive abilities – specifically, their ability to recognize familiar objects and locations. The results were striking. Reducing Sox9 accelerated plaque formation, diminished astrocyte complexity, and hampered the removal of amyloid deposits. Conversely, increasing Sox9 reversed these trends.
“Like a Vacuum Cleaner”
Overexpression of Sox9 not only promoted plaque clearance but also preserved cognitive function in the mice.”We found that increasing Sox9 expression triggered astrocytes to ingest more amyloid plaques,clearing them from the brain like a vacuum cleaner,” explained a corresponding author. “Most current treatments focus on neurons or try to prevent the formation of amyloid plaques. This study suggests that enhancing astrocytes’ natural ability to clean up could be just as important.”
The research indicates that activating astrocytes’ natural cleaning capabilities could halt the neurodegenerative-related cognitive decline characteristic of Alzheimer’s. .
Future Directions and Cautions
While these findings are promising, researchers caution that further examination is needed to fully understand how Sox9 functions in the human brain over time. However, the study undeniably opens the door to potential therapies that could harness the power of astrocytes to combat neurodegenerative diseases.
The research involved contributions from sanjana Murali, Wookbong Kwon, Junsung Woo, Eun-Ah Christine Song, Yeunjung Ko, Debo Sardar, Brittney Lozzi, Yi-Ting Cheng, Michael R. Williamson, Teng-Wei Huang, Kaitlyn Sanchez and Joanna Jankowsky, all at Baylor College of Medicine. This work was supported by national Institutes of Health grants (R35-NS132230, R01- AG071687, R01-CA284455, K01-AG083128, R56-MH133822), the David and Eula Wintermann Foundation, the Eunice Kennedy Shriver National Institute of Child health & Human Progress (P50HD103555), and joint resources from Houston Methodist and Baylor college of Medicine. The study is available in Nature Neuroscience (DOI: 10.1038/s41593-025-02115-w).
