The Naked Mole Rat’s Longevity Secret Just Got Transferred to Mice. Humans May Be Next.

Researchers at the University of Rochester transferred a single gene from the world’s longest-lived rodent into mice and produced animals that were healthier, less cancerous, and longer-lived. The mechanism could eventually be adapted for humans.

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In the annals of aging research, few animals have generated as much scientific fascination as the naked mole rat. Roughly the size of a mouse, hairless, nearly blind, and not conventionally attractive, this burrowing rodent from the Horn of Africa defies nearly every rule biologists thought they understood about how body size relates to lifespan. Most mammals of similar mass live two to five years. Naked mole rats can live more than four decades.

For years, researchers treated this as a curiosity. But as the tools of molecular biology advanced, scientists began asking a more pointed question: what exactly is the naked mole rat doing differently at the cellular and genetic level, and could those mechanisms be moved into another animal?

In 2023, Vera Gorbunova, the Doris Johns Cherry Professor of biology and medicine at the University of Rochester, and her longtime collaborator Andrei Seluanov answered part of that question with a landmark paper in Nature. Their team transferred a single longevity-linked gene from the naked mole rat into mice. The mice produced more of a protective molecule called high molecular weight hyaluronic acid. They developed fewer tumors, showed less age-related inflammation, maintained healthier guts, and lived approximately 4.4 percent longer than unmodified mice. Maximum lifespan extended by 12.2 percent.

The result was published as a proof of concept. A survival mechanism that evolved over millions of years in one of nature’s most resilient mammals could be exported to a different species and produce real biological benefits. The implications for human longevity research are significant.

The Animal That Rewrote the Rules of Aging

Naked mole rats are social, subterranean rodents that live in colonies led by a single breeding queen. They are extraordinarily long-lived for their body size, a phenomenon researchers call “negligible senescence,” meaning they show almost no increase in mortality rate with age. In most animals, including humans, the probability of dying approximately doubles every eight years after sexual maturity. In naked mole rats, that mortality risk barely shifts for decades.

Their resistance to disease is equally striking. Naked mole rats almost never develop spontaneous cancer. They show no meaningful signs of cardiovascular disease as they age. Their neurons appear protected from the kind of age-related deterioration that drives Alzheimer’s and Parkinson’s disease in other mammals. They maintain physical function and reproductive capacity well into their twenties and thirties.

Gorbunova, Seluanov, and their colleagues at Rochester have spent more than two decades documenting the molecular basis for these advantages. Their work has identified multiple overlapping mechanisms: unusually stable ribosomes that make fewer protein errors, more efficient DNA repair pathways, robust anti-cancer surveillance, and a uniquely organized extracellular matrix. The HAS2 gene study zeroed in on one of their most striking earlier findings: that naked mole rats produce roughly ten times more high molecular weight hyaluronic acid than mice or humans.

What High Molecular Weight Hyaluronic Acid Actually Does

Hyaluronic acid is not an exotic substance. It is found in the extracellular matrix of virtually every mammal, plays a central role in joint lubrication, wound healing, and skin hydration, and has become a widely used ingredient in cosmetics and dermatology. Most people have encountered it in face serums or injectable joint treatments.

What makes the naked mole rat’s version different is its molecular weight. Hyaluronic acid comes in multiple forms. Low and medium molecular weight hyaluronic acid can actually promote inflammation. High molecular weight hyaluronic acid, by contrast, appears to suppress inflammatory signaling and serve as a physical barrier around cells that resists malignant transformation.

In 2013, Gorbunova and Seluanov published work in Nature showing that naked mole rats produce a uniquely viscous, high molecular weight form of hyaluronic acid in their tissues, and that this molecule appeared to be a primary reason their cells resisted becoming cancerous. When they removed the enzyme responsible for producing HMW-HA from naked mole rat cells in culture, those cells lost their cancer resistance and began to behave more like the cells of shorter-lived rodents.

That finding set up a direct test: if HMW-HA is genuinely protective, what happens when you engineer another mammal to produce more of it?

The Gene Transfer Experiment

All mammals carry a version of the hyaluronan synthase 2 gene, which encodes the enzyme that produces hyaluronic acid. The naked mole rat version, designated nmrHAS2, appears to be more active than its mouse or human counterparts. The Rochester team believed this heightened activity was part of why naked mole rats produce so much HMW-HA.

To test whether nmrHAS2 could confer benefits in a different animal, Gorbunova, Seluanov, and their colleagues, including Zhihui Zhang, Xiao Tian, J. Yuyang Lu, Kathryn Boit, Julia Ablaeva, Alexander Tyshkovskiy, Vadim Gladyshev, and Steve Horvath, engineered mice to carry and express the naked mole rat version of the gene. They then observed what happened over the animals’ full lifespans.

The modified mice developed elevated levels of hyaluronan in multiple tissues, closely mirroring the pattern seen in naked mole rats. The results across several outcome measures were consistent and meaningful.

Cancer incidence in old mice carrying the nmrHAS2 gene fell by 34 percent compared to age-matched controls. When the researchers exposed mice to a chemical known to induce skin cancer, the genetically modified animals showed stronger resistance. Spontaneous tumor formation was also reduced across the lifespan.

Median lifespan in the nmrHAS2 mice increased by approximately 4.4 percent. Maximum lifespan, measured by the longest-lived animals in each group, extended by 12.2 percent. These are not transformative numbers on their own, but they matter for a specific reason. A single gene was responsible for the effect. The researchers were not running a multi-drug intervention protocol or combining several biological mechanisms. They changed one thing and measured a measurable benefit across the full lifespan of a mammal.

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Results Beyond Cancer: Inflammation and Gut Health

The most conceptually important finding may not have been the lifespan extension or even the cancer reduction. It was the effect on inflammation.

As the nmrHAS2 mice aged, they showed lower levels of chronic inflammation across multiple tissue types compared to controls. This matters enormously in the context of longevity science because chronic, low-grade, persistent inflammation is now understood to be one of the primary biological features of aging itself.

Researchers refer to this phenomenon as “inflammaging,” a term coined by Italian gerontologist Claudio Franceschi to describe the smoldering, systemic inflammatory state that accompanies aging in most mammals and that appears to drive or accelerate nearly every major age-related disease. Inflammaging has been associated with cardiovascular disease, neurodegeneration, metabolic dysfunction, cancer, and frailty. Reducing it is one of the central goals of modern longevity medicine.

The nmrHAS2 mice showed measurably lower inflammatory markers in multiple tissues as they reached old age. Their gut health was also better preserved. The gut microbiome shifts dramatically with age in most mammals, and gut inflammation is increasingly recognized as both a driver of systemic inflammaging and a target for longevity interventions. The genetically modified mice maintained a healthier gut profile through old age, suggesting that HMW-HA may support the gut barrier and the microbial communities it contains.

“Our study provides a proof of principle that unique longevity mechanisms that evolved in long-lived mammalian species can be exported to improve the lifespans of other mammals,” Gorbunova said in the University of Rochester press release accompanying the study.

How HMW-HA May Work at the Cellular Level

The precise molecular mechanism through which HMW-HA produces its broad benefits is not fully resolved, and the Rochester team notes that more work is needed to understand the exact pathways involved. But several plausible mechanisms have emerged from the research.

HMW-HA appears to function as a physical scaffold in the extracellular matrix surrounding cells. A denser, more protective matrix may make it harder for cells to undergo the kind of structural changes associated with malignant transformation, essentially making the microenvironment less hospitable to early-stage cancer. This is consistent with the original 2013 finding that HMW-HA removal made naked mole rat cells cancer-prone.

HMW-HA also appears to interact with receptors on immune cells, including CD44 and RHAMM, in ways that modulate inflammatory signaling. High molecular weight forms of hyaluronic acid tend to suppress inflammatory cascades, while lower molecular weight fragments produced when hyaluronic acid breaks down can actually trigger immune responses. As animals age, the ratio of HMW-HA to its smaller breakdown products shifts unfavorably. Maintaining higher levels of the intact, high molecular weight form may help keep that ratio better calibrated.

There is also evidence that HMW-HA supports stem cell function and tissue repair, suggesting that its benefits may extend into regenerative biology as well as cancer prevention and inflammation control.

A Growing Map of Naked Mole Rat Biology

The HMW-HA finding does not stand alone. Since the 2023 Nature paper, additional research has continued to map the molecular landscape behind the naked mole rat’s extraordinary resilience.

A 2025 study published in Science identified a second potential longevity mechanism involving cGAS, a protein best known for its role in innate immune defense. In mice and humans, cGAS can interfere with DNA repair under certain conditions. Researchers found that the naked mole rat version of cGAS has structural differences that allow it to enhance DNA repair rather than impede it. Experimental models using the modified naked mole rat cGAS showed improved genome stability and delayed signs of cellular aging.

These findings point toward a consistent pattern. Naked mole rats have not found a single master switch for longevity. Instead, they appear to have evolved a suite of overlapping protections, each targeting a different vulnerability that normally accelerates aging in mammals. Better hyaluronic acid production defends against cancer and inflammation. Better DNA repair reduces the accumulation of mutations over time. Other mechanisms protect against protein misfolding, cardiovascular stress, and oxidative damage.

For aging researchers, this matters because it suggests that longevity in any species is not the product of one dominant mechanism. It is an architecture. Understanding that architecture in an animal that has already solved the problem of healthy aging could provide a working blueprint for intervention in humans.

The Path to Human Translation

The obvious question is whether any of this will benefit humans in a clinically meaningful way, and the researchers are measured but genuinely optimistic about the direction of the work.

“It took us 10 years from the discovery of HMW-HA in the naked mole rat to showing that HMW-HA improves health in mice,” Gorbunova noted. “Our next goal is to transfer this benefit to humans.”

The team has identified two primary routes toward human application. One approach is to develop therapies that slow the enzymatic breakdown of HMW-HA in the body, preserving the protective high molecular weight form for longer. The other is to find ways to increase HMW-HA production directly.

“We already have identified molecules that slow down hyaluronan degradation and are testing them in pre-clinical trials,” Seluanov noted. “We hope that our findings will provide the first, but not the last, example of how longevity adaptations from a long-lived species can be adapted to benefit human longevity and health.”

Delivering a gene like nmrHAS2 into humans would require gene therapy, a field that has made substantial progress in recent years through viral vector systems and mRNA platforms, but that still carries meaningful safety and delivery challenges. The more immediately feasible route may be pharmacological: drugs or biologics that mimic the effect of elevated HMW-HA or that block the enzymes responsible for degrading it.

Hyaluronidases, the enzymes that break down hyaluronic acid, are already well-characterized targets in oncology. Several hyaluronidase inhibitors have been studied in the context of cancer treatment, opening the possibility that existing pharmacological knowledge could be redirected toward longevity applications.

None of this is imminent. Pre-clinical trials are a long distance from approved human therapies, and the pathway from a mouse lifespan study to a clinical intervention in humans typically spans a decade or more. But the conceptual foundation is now solid in a way it was not five years ago. A defined molecule, with a defined mechanism, transferred via a defined gene, produced measurable longevity benefits in a mammal. That is the kind of mechanistic clarity that gives drug development a real starting point.

Cross-Species Longevity Science as a Discipline

The broader significance of the Gorbunova and Seluanov program is what it says about how longevity science should be conducted. Much of the field focuses on interventions in already-aging organisms: senolytic drugs that clear zombie cells, caloric restriction protocols, rapamycin and other mTOR inhibitors, metformin, and various approaches to NAD+ repletion. These are valuable, but they are largely about compensating for biological failures that have already begun.

The naked mole rat approach inverts the strategy. Rather than waiting for aging-related damage to accumulate and then trying to reverse or slow it, the naked mole rat has evolved systems that prevent much of the damage from occurring in the first place. Its cells are better defended from the start. Its matrix is more protective. Its repair systems are more active.

The comparative biology of aging has given scientists access to a library of natural longevity experiments conducted across millions of years of evolution. Bowhead whales can live more than 200 years. Ocean quahog clams have been documented at over 500. Greenland sharks may outlive all of them. Each long-lived species carries biological solutions developed under evolutionary pressure to solve the problem of aging. The naked mole rat is one of the best-studied, but it is not unique.

Gorbunova’s lab has pioneered the idea that these solutions are not permanently locked inside the species that evolved them. The HAS2 study is the clearest evidence yet that a mechanism shaped by millions of years of evolution in one animal can be transplanted into another and work. That is not a small result.

What This Means For You

You cannot take a naked mole rat gene today. There is no HMW-HA supplement currently available that replicates the effect shown in the mouse study, and the hyaluronic acid products sold for skin care and joint health are typically lower molecular weight forms that do not produce the same biological effects as the HMW-HA generated by the nmrHAS2 gene. Any product claiming to replicate the Rochester findings is getting ahead of the science.

What you can do is understand where this research sits within a larger framework of longevity science.

The three outcomes the nmrHAS2 gene produced in mice, namely cancer resistance, reduced inflammaging, and healthier gut biology, are outcomes that existing lifestyle interventions also influence, though through different mechanisms. Chronic inflammation is reduced by consistent resistance training, adequate sleep, a diet low in ultra-processed foods, and stress regulation through breathwork and recovery practices. Gut health responds powerfully to dietary fiber, fermented foods, and the avoidance of chronic alcohol use and antibiotic overuse. Cancer risk is meaningfully modulated by weight management, physical activity, and minimizing exposure to environmental carcinogens.

None of those lifestyle factors replaces what a future HMW-HA-based therapy might accomplish. But the biological targets they address are the same ones the naked mole rat has solved. Keeping inflammation low, protecting cellular integrity, maintaining a healthy gut as you age: these are not incidental health goals. They are the core of what the most resilient long-lived mammals do at the molecular level, and they are accessible to every person, right now, through the choices made every day.

The naked mole rat has been running this experiment for millions of years. The University of Rochester has now shown that the results transfer. The next decade of research will determine whether the same proof of concept can be extended to the species doing the studying.

Study reference: Zhihui Zhang et al., “Increased hyaluronan by naked mole-rat Has2 improves healthspan in mice,” Nature 621, 196 (2023). DOI: 10.1038/s41586-023-06463-0.

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