Scientists at Texas A&M University have reversed brain aging in mice using a nasal spray that delivers stem cell-derived particles directly to the brain, reducing inflammation and restoring memory within weeks.
The treatment, described in a study published in the Journal of Extracellular Vesicles, uses microscopic vesicles released by stem cells as natural delivery vehicles. These particles carry microRNAs that act as molecular switches to dampen overactive immune cells and restore mitochondrial function in neurons.
In experiments with middle-aged mice, two doses of the nasal spray produced measurable improvements in cognitive function within weeks. The benefits persisted for months, indicating a lasting effect beyond the treatment period.
Researchers observed a reduction in neuroinflammation — the chronic, low-grade brain inflammation linked to aging and dementia — particularly in the hippocampus, the brain region critical for learning and memory.
Beyond inflammation, the therapy restored cellular energy production. Aging often impairs mitochondria, the cell’s power plants, but treated mice showed renewed mitochondrial activity and reduced oxidative stress in brain cells.
The effects were consistent across both male and female subjects, a notable finding given that many preclinical studies present sex-specific responses to neurological interventions.
“We’re giving neurons their spark back,” said Dr. Madhu Leelavathi Narayana, a senior research scientist on the team. “By reducing oxidative stress and reactivating the brain’s mitochondria, we’re helping cells recover their energy.”
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The intranasal delivery method avoids invasive procedures, allowing the therapeutic particles to bypass the blood-brain barrier and reach target areas directly.
“The mode of delivery is one of the most exciting aspects of our approach,” said Dr. Maheedhar Kodali. “It allows us to reach and treat the brain directly without surgery or implants.”
Texas A&M has filed a U.S. Patent for the technology, signaling intent to pursue clinical translation.
Researchers caution that results in mice do not guarantee similar outcomes in humans, but they see potential applications beyond age-related cognitive decline.
The approach could one day aid stroke recovery or slow Alzheimer’s progression by targeting the underlying inflammatory and metabolic dysfunctions common to multiple neurodegenerative conditions.
In the U.S., new dementia cases are projected to rise from approximately 514,000 in 2020 to nearly 1 million by 2060, according to data cited by the research team.
How does the nasal spray reach the brain without invasive procedures?
The spray delivers stem cell-derived vesicles through the nasal cavity, allowing them to travel directly to the brain via olfactory and trigeminal neural pathways, bypassing the blood-brain barrier.
Why is the therapy’s effectiveness in both sexes considered significant?
Many preclinical neurological studies show divergent outcomes by sex; consistent results across males and females suggest broader applicability and reduce a common barrier to translation.
