In a breakthrough study, scientists have developed a novel Alzheimer’s treatment using nanoparticles that not only slows disease progression but reverses brain damage in mice.
The therapy, created by researchers at the Institute for Bioengineering of Catalonia (IBEC) and West China Hospital at Sichuan University, targets the brain’s vascular system rather than neurons, offering a new approach to removing toxic proteins associated with Alzheimer’s.
The research, conducted in partnership with University College London and several Chinese and Spanish institutions, introduces a new class of nanomedicine.
Unlike conventional methods, where nanoparticles serve only as drug carriers, these are engineered as therapeutic agents themselves. Known as supramolecular drugs, they interact directly with biological systems to restore balance in the brain’s protective environment.
Nanoparticles restore brain’s waste clearance system
At the center of the study is the blood-brain barrier, a cellular shield that regulates what enters the brain from the bloodstream.
In Alzheimer’s disease, this barrier fails to clear harmful proteins such as amyloid-β, which accumulates and disrupts neuron function. The new nanoparticles mimic natural molecules that trigger the clearance process, helping the brain remove toxic waste more efficiently.
🧠 Scientists from #IBEC & @IHuaXi have reversed Alzheimer’s in mice after only 3 injections with bioactive nanoparticles!
This nanotech approach restores the blood–brain barrier instead of targeting neurons, a promising step toward an effective treatment. pic.twitter.com/eIzQwh4Wdq
— IBEC (@IBECBarcelona) October 7, 2025
The team administered just three doses of the treatment to genetically modified mice with high levels of amyloid-β. Within one hour, researchers observed a 50 to 60 percent drop in the toxic protein. Long-term behavioral tests revealed significant improvements in memory and cognition.
Behavioral recovery in advanced disease stages
In one case, an 18-month-old mouse (comparable to a 90-year-old human) showed the behavior of a healthy mouse after receiving the treatment at 12 months of age.
Giuseppe Battaglia, lead investigator and ICREA Research Professor at IBEC, said the effect stems from restoring the brain’s vascular function, triggering a chain reaction that clears toxic molecules and rebalances the system.
Lorena Ruiz Perez, co-author and researcher at IBEC and the University of Barcelona, said the therapy showed remarkable success in repairing the blood-brain barrier and reversing Alzheimer’s pathology, marking it as a promising clinical strategy.
The nanoparticles were designed using a bottom-up molecular engineering approach, with precise size control and carefully arranged surface molecules. This structure allows them to interact with cell receptors in a targeted manner, activating a natural transport mechanism that moves harmful proteins out of the brain.
The findings, published in Signal Transduction and Targeted Therapy, underscore the crucial role of vascular health in neurodegenerative diseases and open new pathways for future Alzheimer’s treatment development using nanoparticles.
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