Researchers at Texas A&M University say they may have discovered a surprising new way to help aging brains work better again.
In a new study, scientists found that a special nasal spray reduced inflammation in the brain, improved memory, and restored important brain cell functions after only two doses.
The findings have raised hopes that future treatments may one day help people suffering from dementia, Alzheimer’s disease, and other forms of age-related cognitive decline.
The research was led by Dr. Ashok Shetty together with Dr. Madhu Leelavathi Narayana and Dr. Maheedhar Kodali. The study was published in the Journal of Extracellular Vesicles.
As people grow older, the brain naturally changes over time. Many older adults notice problems such as forgetfulness, slower thinking, or trouble learning new information. Scientists have long believed that one major reason for this decline is chronic inflammation inside the brain.
This process is sometimes called “neuroinflammaging.” Unlike the short-term inflammation that helps the body fight infections or heal injuries, chronic inflammation can slowly damage brain tissue over many years.
Researchers believe this ongoing inflammation contributes to diseases such as Alzheimer’s disease and other forms of dementia. It may also interfere with the brain’s ability to repair itself and maintain healthy communication between nerve cells.
The Texas A&M researchers wanted to see whether reducing this inflammation could help restore brain function.
To do this, they developed a treatment using tiny biological particles called extracellular vesicles, or EVs. These microscopic structures naturally move information between cells inside the body.
The researchers loaded the EVs with molecules called microRNAs. MicroRNAs help control how genes work inside cells and play an important role in many biological processes.
The scientists then delivered the treatment through a nasal spray.
This approach is important because the brain is protected by a strong barrier that prevents many drugs from entering brain tissue easily. By using the nose as the delivery route, the treatment was able to travel directly into the brain without surgery or invasive procedures.
Once inside the brain, the treatment targeted immune cells involved in chronic inflammation.
The researchers found that the therapy reduced activity in several inflammatory systems strongly linked to aging and neurodegenerative disease. At the same time, the treatment improved the function of mitochondria, which are tiny structures inside cells responsible for producing energy.
Mitochondria are often described as the power plants of cells because they provide the energy needed for cells to survive and function properly. Aging and inflammation can damage mitochondria, making brain cells weaker and less efficient.
By restoring mitochondrial function, the researchers believe the treatment helped brain cells regain some of their ability to process and store information.
The study also found clear improvements in memory and learning behavior. Treated subjects performed better on tasks involving object recognition and environmental awareness compared to untreated subjects.
Perhaps most surprisingly, the benefits appeared quickly and lasted for months after only two doses of the nasal spray.
The researchers say this may point to a future where simple treatments could help slow or even partially reverse certain aspects of brain aging.
The findings come at a time when dementia cases are rising rapidly around the world. In the United States alone, annual dementia cases are expected to nearly double over the next few decades as populations age.
Scientists are therefore searching urgently for new treatments that can protect brain health and preserve cognitive abilities later in life.
The researchers also noted that the treatment appeared to work similarly in both males and females, which is important because some medical treatments show different results between sexes.
Although the findings are exciting, the scientists stressed that the research is still in its early stages. The study has not yet been tested in humans, and much more research will be needed before the nasal spray could become a real medical treatment.
Future clinical trials will need to confirm whether the therapy is safe and effective for people. Researchers also need to better understand possible long-term effects and whether repeated treatments may be necessary.
Still, the study offers a promising new direction in brain aging research. Instead of simply managing symptoms after cognitive decline occurs, scientists may eventually be able to directly target the biological processes driving brain aging itself.
Looking at the study overall, the findings appear highly promising because the treatment addressed multiple aging-related problems at once, including inflammation, energy production, and memory function.
The use of a noninvasive nasal spray also makes the approach especially attractive compared to more invasive therapies. However, caution is still necessary because the research was performed before human testing.
Many treatments that work well in early laboratory studies do not always succeed in human clinical trials. Even so, the study provides important evidence that brain aging may not be completely irreversible and could potentially be slowed or partially restored through future biological therapies.
Source: Texas A&M University.
