Breakthrough in Brain Aging Research
Researchers at Texas A&M University have developed an experimental nasal spray that appears to reverse brain aging after just two doses, according to findings published in the Journal of Extracellular Vesicles. The treatment restored memory function, reduced chronic brain inflammation, and improved cellular energy systems in ways that could transform how medicine approaches neurodegenerative diseases.
Dr. Ashok Shetty, who led the study alongside senior research scientists Dr. Madhu Leelavathi Narayana and Dr. Maheedhar Kodali, described the results as potentially redefining what it means to grow old. The therapy targets neuroinflammaging, the persistent low-grade inflammation that accumulates in aging brains and contributes to cognitive decline.
“Brain age-related diseases like dementia are a major health concern worldwide,” Shetty said. “What we’re showing is brain aging can be reversed, to help people stay mentally sharp, socially engaged and free from age-related decline.”
How the Nasal Spray Works
The treatment uses microscopic biological particles called extracellular vesicles loaded with microRNAs, molecules that regulate gene expression and signaling pathways in the brain. These vesicles naturally transport genetic material between cells, making them ideal delivery vehicles.
Administered through intranasal spray, the therapy bypasses the blood-brain barrier and travels directly into brain tissue. Once inside, it targets immune cells responsible for chronic inflammation, suppressing inflammatory systems including the NLRP3 inflammasome and cGAS-STING signaling pathways.
“MicroRNAs act like master regulators,” Narayana explained. “They help modulate and regulate many gene and signaling pathways in the brain.”
The delivery method represents one of the most significant advances in the approach. “Intranasal delivery allows us to reach and treat the brain directly without invasive procedures,” Kodali said.
Restoring Cellular Energy and Memory Function
Beyond reducing inflammation, the treatment restored mitochondrial activity, the cellular structures responsible for producing energy. Aging and inflammation damage mitochondria, leaving brain cells less efficient and more vulnerable to deterioration.
By improving mitochondrial function, the therapy helped neurons recover their ability to process and store information. Behavioral testing showed treated subjects performed significantly better on memory and recognition tasks, with improvements lasting months after only two doses.
“We are giving neurons their spark back by reducing oxidative stress and reactivating the brain’s mitochondria,” Narayana said. “We are seeing the brain’s own repair systems switch on, healing inflammation and restoring itself.”
The treatment response was consistent across both sexes, something researchers noted as relatively uncommon in biomedical studies.
Implications for Dementia Treatment
The findings carry particular significance as dementia rates continue climbing. In the United States, annual dementia cases are projected to increase from approximately 514,000 in 2020 to around 1 million by 2060.
“The trend signals a pressing need for policies and innovative interventions that can minimize both the risk and severity of neurodegenerative disorders like dementia,” Shetty said.
Researchers believe the approach could eventually replace invasive procedures or months of medication with a simple two-dose nasal spray. Future applications may extend to stroke recovery and slowing age-related cognitive decline.
The National Institute on Aging supported the research, and the team has filed a U.S. patent. While human trials remain necessary, the study suggests brain aging may not be an unavoidable consequence of getting older.
“Our approach redefines what it means to grow old,” Shetty said. “We’re aiming for successful brain aging: keeping people engaged, alert and connected. Not just living longer, but living smarter and healthier.”