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The new treatment being developed by Duke University researchers takes an innovative approach to healing the brain after a stroke: skip trying to directly replace dead cells, and insterad focus on injecting an injectable biomaterial which would help the body heal itself.
As important as it is, this treatment is still in its preclinical stages, testing this treatment on animals, and so should not be thought of as something currently available for stroke patients. However, what these researchers have discovered might be helpful in developing a stroke therapy for humans.
Why healing the brain after a stroke is so hard
When a stroke happens, it can either be caused by a blockage or by a rupture, with the blockage being more common. Stroke therapy usually focuses on opening up blocked blood vessels or repairing ruptured vessels in order to restore blood flow to the affected area.
While treatments such as thrombolysis and thrombectomy can be helpful for some patients, they are not able to directly reverse the damage to the brain that the stroke caused. More severe strokes might leave a cavity, as the brain tissue dies, and while rehabilitation therapy can be helpful to stroke survivors, this is not a complete solution.
According to the World Health Organization statistics cited in the report, there are about 11.9 million new strokes per year, and around 93.8 million people suffer from its consequences worldwide.
A scaffold to help the brain repair itself
The research paper describes an injectable biomaterial made from hydrogel microparticles called MAPS, or Microporous Annealed Particle Scaffolds.
These particles can be introduced directly into the affected area in liquid form. Once there, it forms a sponge-like structure of interconnected pores and fibres.
Instead of trying to directly transform into brain tissue, this scaffold will provide a foundation for cells to come onto it and begin the healing process.
Additionally, the researchers introduced extracellular vesicles, which they isolated from astrocytes, brain cells which provide support. The researchers attached these vesicles to the hydrogel microparticles, combining them together with chemical bonds.
The vesicles contained a number of signalling molecules, including IL-4 and C1q, which the researchers hoped would help recruit helpful immune cells to begin healing at the site of the stroke.
Crucially, the researchers noticed that by localizing these signals to the site of the stroke was critically important. If they had simply injected these vesicles without the scaffold, they would not have worked. The structure itself was needed to localize and focus the healing response.
What the researchers saw in mice
The treatment proved to be effective, as the mice who received it showed the generation of new blood vessels and nerve fibres at the site of the injury, and the development of new brain tissue at the edges of this cavity.
The researchers then conducted some motor coordination tests, and found that, as of about eight weeks after the treatment, the treated mice were performing as well as the control mice on average, and this improvement lasted.
Another interesting discovery was the timing of the treatment. The injection was given to the mice more than 24 hours after their strokes. Usually, treatments for stroke focus on restoring blood flow as soon as possible, and usually, that window for reperfusion therapies is within a few hours of the stroke happening.
However if these results are applicable to humans, then a treatment which could be administered later, after this early window, would be a huge deal.
This is not a human treatment yet
This hopeful news should not be mistaken for a confirmed treatment. As mentioned at the very beginning, this is still a preclinical treatment, being tested on mice. Additionally, the vesicles were taken from rat astrocytes, so much more research would be required before a similar treatment could be tried on humans.
The researchers themselves pointed to creating human versions of these vesicles using human pluripotent stem cells as one of their future goals, and would need to conduct more trials on animals before human trials could even begin. Such trials would be necessary to confirm both that this treatment was safe and that it was actually effective.
The researchers should continue their work, but currently, there are still are a lot of questions which need answering. Would this treatment be safe for humans? Would the repaired tissue be functional? And would the results seen in mice be repeatable in humans with different stroke types and severities? What additional risks or dangers might a treatment like this have?
An interesting potential, but not a confirmed one
What is interesting about this treatment is that its approach differs from many previous regenerative medicine treatments for strokes. Instead of directly trying to grow new tissue to replace the dead tissue, the researchers focused on creating a scaffold which would help the body repair itself.
It is very promising that this approach was effective in mice, with the growth of new blood vessels, nerve fibres and brain tissue, and the improvement in motor coordination seen in the treated mice. With that said, it is an extremely large jump from an interesting preclinical study to an actual treatment for humans. For now, this should be seen as nothing more than an interesting potential possibility.
People who have suffered strokes should reach out to medical professionals for help as soon as possible, rather than waiting for a regenerative therapy which might come in the future.
Sources and further reading
The original report contains links to the full story on Sciencedaily and La Tercera:
• ScienceDaily: Treatment developed to help the brain regenerate after a stroke
• La Tercera: Científicos desarrollan un tratamiento que podría ayudar al cerebro a regenerarse después de un ACV
Source URLs provided with the original report:
https://www.sciencedaily.com/releases/2026/09/260902234512.htm
