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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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Scientists Just Reversed Aging in Mice — Could Humans Be Next?

For centuries, humans have dreamed of slowing down aging or even reversing it. While immortality remains a distant goal, a groundbreaking new study from Israeli and American scientists suggests that some aspects of aging may be reversible.

Researchers from Bar-Ilan University, the National Institute on Aging, and Tel Aviv University have reported that they successfully reversed important signs of aging in the livers of older mice. Their findings, published in the prestigious journal Nature Communications, offer new hope for extending healthy human lifespan in the future.

The study focuses on a special protein called SIRT6, often referred to as the "longevity protein" because of its powerful role in regulating aging and maintaining cellular health.

A Surprising Discovery

According to the researchers, increasing the amount of SIRT6 in elderly mice restored many age-related changes in their liver cells to a more youthful condition.

Professor Haim Cohen, who supervised the study and directs the Sagol Healthy Human Longevity Center at Bar-Ilan University, explained the achievement in simple terms:

"We took an old liver and restored its DNA organization toward a much younger state."

This does not mean the mice became young again. However, the biological markers associated with aging showed significant improvement, suggesting that aging may not be a completely irreversible process.

The research was led by doctoral students Ron Nagar and Zacharia Schwartz, who helped uncover how SIRT6 influences the aging process at a molecular level.

What Is SIRT6?

SIRT6 is a protein found mainly inside the nucleus of cells, where DNA is stored. Scientists have long known that it plays several important roles in maintaining health.

It helps:

  • Repair damaged DNA

  • Control metabolism

  • Regulate inflammation

  • Protect cells from stress

  • Influence lifespan and healthy aging

Professor Cohen has been studying SIRT6 for many years. In fact, back in 2012, his team became the first in the world to demonstrate that increasing SIRT6 levels could extend the lifespan of mice.

That earlier discovery sparked worldwide interest in the protein and its potential role in combating age-related diseases.

Understanding Aging at the DNA Level

To understand the new breakthrough, it helps to know how DNA is organized inside cells.

Human DNA is incredibly long. If stretched out, the DNA in a single cell would measure about two meters. To fit inside a tiny cell nucleus, DNA must be carefully folded and packed.

This packaging system is called chromatin.

When we are young, chromatin is tightly organized and functions efficiently. As we age, however, this structure gradually becomes loose and disorganized.

Scientists believe this deterioration contributes to many age-related problems, including chronic inflammation, cellular dysfunction, and disease.

The research team wanted to determine whether increasing SIRT6 could restore chromatin to a healthier state.

Testing the Theory

For the experiment, researchers allowed mice to age naturally until they reached about 24 months old. This age roughly corresponds to humans in their seventies or eighties.

The scientists then increased SIRT6 levels specifically in the livers of these older mice.

Another group of mice received activation of a different gene that was not expected to affect aging. This served as a comparison group.

Using advanced genetic tools, researchers examined DNA structure and measured gene activity in real time.

What they discovered surprised them.

Many of the age-related changes in chromatin did not simply slow down—they actually reversed.

The DNA organization in older liver cells began to resemble the patterns normally seen in much younger animals.

The Hidden Switch of Aging

One of the most important findings involved a molecular marker called H3K9ac.

Think of H3K9ac as a switch that helps determine whether certain sections of DNA are open or closed.

As mice aged, many of these switches became stuck in the "open" position. This caused genes linked to harmful inflammation to become active when they should have remained silent.

Inflammation is one of the major drivers of aging and age-related diseases.

The researchers found that SIRT6 effectively repaired this problem.

By influencing H3K9ac, SIRT6 helped close these switches again, restoring tighter DNA packaging and reducing unwanted gene activity.

According to Cohen, this process represents part of the "hidden language of longevity" that scientists are only beginning to understand.

Why This Matters

The findings are exciting because they suggest aging may be more flexible than previously believed.

For decades, many scientists viewed aging as a one-way process. Once cells accumulated damage, there seemed to be little that could be done.

This study challenges that idea.

Instead of merely slowing aging, SIRT6 appears capable of reversing some age-related biological changes.

If similar effects can eventually be achieved in humans, the benefits could be enormous.

Potential future applications might include:

  • Maintaining healthier organs for longer

  • Reducing chronic inflammation

  • Delaying age-related diseases

  • Improving quality of life in old age

  • Extending healthy lifespan rather than simply extending life

The goal is not necessarily to make people live forever, but to help them remain healthier and more active as they age.

From Mice to Humans

Of course, there is an important limitation.

The research was conducted in mice, not humans.

Many treatments that show promise in animals do not always produce the same results in people.

Nevertheless, scientists are optimistic because SIRT6 exists in both mice and humans and performs similar biological functions.

Professor Cohen believes the findings provide strong evidence that future human applications may be possible.

His team has even established a biotechnology company called SirTLab to explore ways of increasing or restoring SIRT6 activity in humans.

This could eventually lead to therapies designed specifically to promote healthy aging.

Expert Reactions

Dr. Nir Barzilai, director of the Institute for Aging Research at the Albert Einstein College of Medicine, was not involved in the study but considers SIRT6 one of the most promising areas in longevity science.

Barzilai has spent years studying centenarians—people who live beyond 100 years of age.

Interestingly, some of these exceptionally long-lived individuals carry genetic variations related to SIRT6 that may contribute to slower aging.

He believes discoveries involving SIRT6 could transform the way medicine approaches aging in the future.

Rather than treating diseases one at a time, scientists may eventually target the aging process itself.

The Future of Longevity Research

The idea of reversing aging has long belonged to science fiction. Today, however, advances in genetics, molecular biology, and longevity research are turning that dream into a serious scientific pursuit.

Researchers are learning that aging is not simply the passage of time. It is a biological process driven by specific molecular mechanisms that may be modified, repaired, or even reversed.

While no one has discovered the secret to immortality, studies like this bring scientists one step closer to understanding how the body ages and how those processes might be controlled.

For now, the results remain limited to laboratory mice. Yet they offer a fascinating glimpse into a future where aging may no longer be viewed as an unavoidable decline, but as a biological challenge that science can increasingly manage.

And if the promise of SIRT6 continues to hold true, the dream of living longer, healthier lives may be far closer than we once imagined.

Reference: Nagar, R., Schwartz, Z., Katz, A. et al. SIRT6 overexpression counteracts chromatin aging in the male murine liver. Nat Commun (2026). https://doi.org/10.1038/s41467-026-73115-y

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