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Stronger muscles may help protect aging brains

Increasing a certain protein in muscle tissue helped prevent memory loss in mice

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Mark Huffman
Reporter

Mark Huffman has covered consumer issues since 2004, with a special focus on protecting and empowering older adults. A former news correspondent for the Associated Press Radio Network, Westwood One, and ConsumerAffairs, Mark brings decades of journalistic experience to RetirementLiving.com. He is passionate about giving consumers a voice and helping them make informed decisions. Mark has also created educational content, including Senior Scam Alert, a video resource designed to help seniors recognize and avoid fraud. He holds a B.A. from the University of Kentucky and lives with his family in Richmond, Virginia.
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Photo by Centre for Ageing Better on Unsplash

Key Insights

  • Boosting an exercise-related protein in muscle protected memory in Alzheimer’s mice
  • Treatment improved brain function even without reducing plaques
  • Study hints that muscle health could play a major role in protecting the brain

A new study suggests that the key to fighting Alzheimer’s disease might not be only in the brain; it could also be in your muscles.

Scientists from Florida Atlantic University and the University of Copenhagen found that increasing a certain protein in muscle tissue helped prevent memory loss in mice bred to develop Alzheimer’s disease. The findings, published in the journal Aging Cell, offer a fresh angle on how lifestyle factors like exercise may help protect the brain.

The research focuses on Cathepsin B (Ctsb) — a protein released by muscles during exercise. Earlier studies suggested Ctsb might help with memory, but this experiment took it a step further.

Researchers boosted the amount of Ctsb produced in the muscles of Alzheimer’s-model mice using a harmless gene therapy. The results were remarkable:

  • The treated mice did not develop the usual memory problems,
  • Their brains continued to grow new neurons in the hippocampus, the memory center of the brain,
  • And their brain and blood looked more like those of healthy mice.

“Our study is the first to show that increasing Cathepsin B in muscle can prevent memory loss in an Alzheimer’s model,” said Henriette van Praag, Ph.D., one of the study’s lead researchers.

Why this is so unexpected

Most Alzheimer’s treatments try to reduce brain inflammation or break down amyloid plaques — clumps of protein linked to the disease. But in this study, those plaques and inflammation stayed the same.

Even so, memory and brain function improved.

This suggests Ctsb might help the brain in a completely different way — possibly by restoring the brain’s ability to make important proteins needed for learning and memory.

“We’ve always known exercise is good for your brain,” said Atul S. Deshmukh, Ph.D., co-author from the University of Copenhagen. “This helps explain why. Muscles send signals that can actually support brain health.”

Not a one-size-fits-all solution

One surprising twist: when healthy mice (those without Alzheimer’s) received the same treatment, their memory actually got worse. Researchers think healthy muscle may react differently to the gene therapy.

That means it’s far too early to consider this a treatment for people — but it is a big step toward understanding how muscles and the brain communicate.

The study adds to growing evidence that the connection between muscle activity and brain health is stronger than previously thought. Exercise may help protect the brain not just by improving blood flow or reducing stress, but by sending powerful chemical messages from muscles to the brain.

“Targeting muscle could eventually become a low-cost, non-invasive option for slowing neurodegenerative diseases,” van Praag said.

While the research is still in its early stages, one message is clear: taking care of your muscles may be more important for your brain than anyone realized.