A new study from Texas A&M University suggests that brain aging linked to long-term inflammation may be partly reversible. As people grow older, low-level inflammation builds up in the brain, especially in areas important for memory. Scientists call this process neuroinflammaging. It contributes to brain fog, slower thinking, memory problems, and higher risk of disorders such as Alzheimer's disease. Until recently, experts viewed it as an unavoidable part of aging.
The study tested a nasal spray made with extracellular vesicles. These are tiny natural parcels released by cells that carry signaling molecules, including microRNAs. MicroRNAs are small pieces of genetic material that help control gene activity and reduce harmful processes in the body. In the experiments, two doses of the spray delivered the vesicles directly to the brain. The treatment lowered key inflammation pathways known as the NLRP3 inflammasome and cGAS-STING signaling. It also restored mitochondria, the small structures inside cells that produce energy, and reduced oxidative stress that damages neurons.
Nasal delivery offers direct brain access
The spray allowed the vesicles to bypass the blood-brain barrier. Within weeks, treated subjects showed less inflammation, healthier cell energy production, and better performance in memory and object-recognition tests. The benefits lasted for months. Results appeared similar in both males and females. The findings were published in Journal of Extracellular Vesicles.
Researchers noted that the approach could one day support healthier cognitive aging without surgery or long-term drugs. It may also help conditions such as stroke recovery. A patent has been filed for the therapy. While the work used animal models and further human studies are needed, the results point to a possible simple method for easing age-related brain decline and supporting mental sharpness in later life.
The study highlights growing interest in non-invasive ways to address brain health as dementia cases are expected to rise sharply in coming decades. If confirmed in people, such a treatment could help individuals remain active and independent longer.