A Nasal Spray Reversed Brain Aging in Mice. Humans Could Be Next: Milky Way News

EARTH, Laniakea Supercluster—Memory loss and a diminished state of self are frequently described as the first major symptoms of dementia. A new experimental therapy just gave aging mice a way to hold onto both, and researchers believe humans could be next.

In a study released late this spring by Texas A&M in partnership with the National Institute on Aging (NIA), scientists worked with lab mice, exploring a direct (but not scalpel-to-skin direct), way to relieve their brains of neuroinflammation, one of the leading causes of Alzheimer's and dementia.

Researchers pulled a delivery system called extracellular vesicles, or EVs, from human stem cells trained to act like brain cells. Think of the EVs as a sort of Amazon vehicle dropping off instructions called “microRNAs” that essentially remind the brain how to function normally again.

Loading embed...

The instructional cocktail was routed through the nasal passages to target the NLRP3 inflammasome (a protein complex that acts like an alarm bell for the immune system) which helped the mice’s tiny brains get their groove back.

Your Brain Takes Out Its Own Trash. Now We Know How.

A region everyone assumed was just an artery turns out to be part of the brain's cleanup crew. The discovery could reshape how we hunt for Alzheimer's before symptoms ever start.

When the inflammation quieted, the mitochondria inside those neurons—the cellular batteries that keep memory making possible—finally had room to recharge. As they did, the brains’ repair systems came back online.

“Our rationale is to develop an efficient, non-invasive therapy that can be repeatedly administered with ease,” Dr. Ashok Shetty, university distinguished professor and associate director of the Institute for Regenerative Medicine, told Milky Way News. “If validated, a nasal spray could offer a practical, patient-friendly way to deliver EVs to the brain.”

The mice were given two doses of the fast-acting therapy, aimed at the hippocampus—that fleshy hard drive at the center of the brain that helps encode new memories. Within two months, researchers saw reduced inflammation and the mice showed measurable improvement in several cognitive areas including memory and recognition.

“Because our study used extracellular vesicles (EVs) derived from human neural stem cells, we are optimistic that the therapeutic benefits observed in our animal model may translate to human patients,” Shetty wrote in an email. “Nonetheless, results from preclinical studies do not always predict clinical success. Only carefully designed human clinical trials can determine the true safety, efficacy, and potential of this therapy.”

Scientists Just Hacked Axolotl Genes to Nudge Mice Toward Regrowing Limbs

Are humans next?

That’s not a cure. But with new U.S. dementia cases projected to nearly double from 514,000 in 2020 to 1 million new cases by 2060 according to the National Institutes of Health, regenerative researchers know this is a mission to help people find answers and live better lives while holding onto a sense of self.

“This therapy is an important first step toward extending healthspan—particularly better brain function during aging—rather than focusing solely on lifespan,” Shetty emphasized. “By improving quality of life and delaying age-related diseases, we aim to help individuals maintain independence and cognitive function as they age, rather than adding years to life.”

Like all good things, time… and money… will decide much of the timeline for this and other brain-age related therapies. FDA trials might be down the road—but it’s a long road.

“This approach could potentially treat a range of brain conditions marked by inflammation,” Shetty said. “However, translating these results into clinical application is a complex and lengthy process. We must first develop clinical-grade EVs through advanced manufacturing and rigorous quality control, then secure the necessary regulatory approvals and substantial funding.”

Are Your Memories Real or Fake? New Study Sheds Light on Mind-Bending Paradox

Researchers found that the best arguments for trusting our own memories are logically circular, and we may need to rethink how we reason about time, entropy, and reality itself.

With patents already in place there’s optimism in the medical community around therapies that ease dementia’s load on the brain.

For now, the therapy sits in a pipette aimed at a mouse's nose. If it clears the hurdles ahead, it may one day sit in a bottle aimed at yours.