They are called astrocytes, they have a star shape and for years we have considered them simple helpers of neurons. Today, however, research puts them under the spotlight as possible allies in the fight against Alzheimer’s, and this is not an exaggeration: they could literally “clean up” the brain.
The study comes from Baylor College of Medicine, in the United States, and shows a natural mechanism that until yesterday seemed almost invisible. Scientists have discovered that by increasing a protein called Sox9, astrocytes become much better at eliminating amyloid plaques, those toxic accumulations that form in the brain and are among the main signs of Alzheimer’s.
We are talking about results obtained in mouse models, but solid enough to turn on more than a light bulb: when Sox9 increases, astrocytes demonstrate a surprising ability to protect memory and thinking skills.
More active, stronger astrocytes with a decisive role in plaque removal
Astrocytes, often ignored in discussions on neurodegenerative diseases, become the protagonists in this study. The scientists “pushed them” by increasing Sox9 in mice that had already developed cognitive deficits and amyloid plaques, at a stage very similar to that of real patients.
For six months they monitored the mice, observing how they recognized familiar places and objects. Finally, with the brain under analysis, the difference was evident: when Sox9 was reduced, the plaques increased faster and the astrocytes became less complex, less active, almost emptied of their natural function; when Sox9 was enhanced, the exact opposite happened.
The neuroscientist Benjamin Deneen explains the phenomenon, describing the enhanced astrocytes as real biological “vacuum cleaners”, capable of incorporating plaques and freeing the brain from accumulations. A perfect metaphor to make us understand what we are talking about: cells that no longer stand by and watch, but intervene on the front line.
Scientists point out that it will still take time to understand whether the same mechanism also works in the human brain. But the fact that a protein can change the behavior of astrocytes so much opens up a new scenario: instead of thinking only about neurons, we could focus on strengthening the cells that protect them.
Sox9 and the future of therapies
The idea of astrocyte-based therapy sounds almost revolutionary. For years we have focused on blocking the formation of plaques, while this study suggests another path: strengthening those who calm them already know how to eliminate them. Simply put, perhaps the brain already has its own cleanup crew. We just need to understand how to give her the right tools to work better.
Choi and Deneen, authors of the study, underline that we are not yet faced with a cure, but we are faced with a very promising indication. If Sox9 plays a similar role in humans, future therapies could be based on the activation or strengthening of this natural mechanism. For a disease that still doesn’t have a definitive solution, that means one important thing: There’s a new piece of the puzzle that’s finally starting to fit together.
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