One Protein Made Old Mice Stronger and Healthier

Scientists may have found a way to help us age better, and it starts with a protein that puts the brakes on inflammation.

Researchers at the University at Buffalo worked with elderly mice and boosted their levels of a protein called tristetraprolin, or TTP. The results were remarkable: the older mice became stronger, walked better, had more endurance, and developed healthier bones.

The secret lies in fighting something scientists call "inflammaging." As we age, our bodies experience constant low-level inflammation that gradually damages tissues and weakens our immune systems. TTP works by breaking down inflammatory signals before they can build up and cause harm.

The problem is that TTP naturally decreases as we get older, especially in our immune cells. That drop allows inflammation to spread throughout the body, contributing to frailty, bone loss, fatigue, and declining strength.

Lead researcher Keith Kirkwood and his team spent six years studying whether restoring TTP could reverse some of these aging problems. They genetically modified 22-month-old mice so the protein remained stable in their systems.

The improvements were significant. Male mice with increased TTP showed much lower frailty scores than untreated mice, with better grip strength, walking ability, and physical performance. Female mice also improved, though the changes were smaller, possibly due to their size and declining estrogen levels.

Most encouraging was what happened to their bones. Both male and female mice developed stronger bones and showed reduced bone breakdown when TTP expression was enhanced. Their immune systems also looked more youthful.

Why This Inspires

By 2050, nearly one in four Americans will be 65 or older, and many will live into their 90s. While medicine has extended our lifespans, the physical challenges of aging remain daunting for millions.

This research, funded by a $2.1 million grant from the National Institutes of Health, offers hope that we might not just live longer but live better. About 15% of Americans over 65 who don't live in nursing homes experience frailty, and this discovery points toward potential interventions that could maintain quality of life.

Kirkwood cautions that human treatments remain years away. Early drug screening efforts to find compounds that increase TTP haven't yet succeeded, but the team continues searching.

The researchers are now planning studies to see if TTP could help reduce brain inflammation linked to dementia and Alzheimer's disease.

"I'm optimistic about where this research could lead and what we may learn as studies continue over time," Kirkwood says.