Every body keeps a quiet ledger of its years, written in chemical tags on its DNA and in the background hum of inflammation, and a team at the University of Southern California has begun to read that ledger for a surprising entry: people who received the shingles vaccine appear to age more slowly beneath the surface. The shingles virus, a childhood chickenpox that never fully leaves, has long been known for its painful waking; this study suggests that holding it in check may also be linked to a gentler passage through the decades. The evidence, drawn from nearly 4,000 Americans and published i
Shingles Vaccine May Slow Biological Ageing, Early US Study Suggests
Biological age is a different matter from the number of birthdays.
Mark
So what did the researchers actually find?
Mimi
Among nearly 4,000 Americans, those who had the shingles vaccine had lower chronic inflammation, slower epigenetic and transcriptomic ageing, and a better overall biological ageing score.
Mark
What does slower genetic ageing mean in practice?
Mimi
Epigenetic ageing tracks chemical tags building up on DNA that change gene activity. Transcriptomic ageing looks at how genes are copied into RNA. Both are ways of estimating how worn the body is, beyond its calendar age.
Luke
Careful with the word 'slower,' though. This is observational. It shows an association, not that the vaccine caused it.
Mimi
Right, and the researchers say so. The healthy user effect is a real worry: vaccinated people tend to be healthier, wealthier and more engaged with healthcare.
Mark
Does anything in the data push back on that?
Mimi
People vaccinated four or more years before their blood draw still showed slower biological ageing than the unvaccinated.
Luke
That's suggestive, not conclusive. The reporting doesn't say how the study adjusted for health or income, so I wouldn't treat that finding as ruling out the healthy user effect.
Mark
And the mechanism?
Mimi
Kim suggests the vaccine may reduce background inflammation, possibly by preventing the virus from reactivating.
Luke
Note the hedges: 'possibly,' 'may.' That's a hypothesis, not something the study demonstrated.
Il Polso
- A blood-based study of nearly 4,000 Americans has found that shingles-vaccinated people look biologically younger than their unvaccinated peers.
- Lower chronic inflammation and slower DNA-based ageing signals have surfaced, stirring hope that a routine jab might do more than prevent a painful rash.
- Researchers are cautiously cross-checking their own result, warning that healthier, wealthier people may be the ones who get vaccinated in the first place.
- The effect persisted among people vaccinated four or more years earlier, pushing scientists toward follow-up trials to settle whether the vaccine truly slows ageing.
Every body keeps a quiet ledger of its years, written in chemical tags on its DNA and in the background hum of inflammation, and a team at the University of Southern California has begun to read that ledger for a surprising entry: people who received the shingles vaccine appear to age more slowly beneath the surface. The shingles virus, a childhood chickenpox that never fully leaves, has long been known for its painful waking; this study suggests that holding it in check may also be linked to a gentler passage through the decades. The evidence, drawn from nearly 4,000 Americans and published in The Journals of Gerontology, is tantalising but not yet conclusive, since those who choose vaccines may already be the healthier and more prosperous among us. Whether the jab truly slows the clock is a question that only carefully designed trials can finally answer.
A single blood sample can reveal a surprising amount about how fast a person is ageing. Jung Ki Kim and colleagues at the University of Southern California used that idea to study nearly 4,000 Americans, asking whether those who had received the shingles vaccine looked biologically younger than those who had not. On several measures, they did.
Shingles comes from the chickenpox virus, which lies dormant in the body for decades and can reawaken as a blistering rash, sometimes leaving lasting nerve pain. The risk grows with age as the immune system weakens. The researchers looked beyond birthdays to measures of how well the body is holding up: chronic inflammation, which is linked to heart disease and cognitive decline, and two kinds of genetic ageing, one involving chemical tags on DNA and the other involving how genes are copied into RNA. Vaccinated participants showed lower inflammation, slower ageing on both measures, and a better overall score.
Kim suggested that the vaccine might ease this background inflammation by preventing the virus from reawakening, and that vaccines may support healthy ageing in ways beyond preventing infection. The study cannot prove cause, however. Those who choose vaccination may already be healthier, wealthier and more engaged with medical care. One detail complicates that view: people vaccinated four or more years before their blood was drawn still showed slower ageing. That persistence is why the researchers believe follow-up trials are needed to learn whether the jab truly slows the body's clock.
A blood sample can say a surprising amount about how fast a person is aging, and a team led by Jung Ki Kim at the University of Southern California used that idea to look at nearly 4,000 Americans. They wanted to know whether people who had received the shingles vaccine looked biologically younger than those who had not. On several measures, the vaccinated group did.
Shingles, known medically as herpes zoster, comes from the reactivation of the chickenpox virus, which can sit dormant in the body for decades. When it wakes, it causes a blistering rash and can leave behind long-lasting nerve pain called post-herpetic neuralgia. The risk climbs with age, as the immune system weakens.
Biological age is a different matter from the number of birthdays. It reflects how well the body is holding up over time. The researchers measured several aspects of it, starting with inflammation, which tends to rise as people get older. They also examined two forms of genetic ageing. The first, epigenetic ageing, concerns chemical tags that accumulate on a person's DNA over the years and change how active the genes are. The second, transcriptomic ageing, looks at how genes are copied into RNA, a step needed to produce the proteins that keep cells working.
On average, vaccinated participants had lower levels of chronic inflammation, slower epigenetic and transcriptomic ageing, and a better overall biological ageing score. That inflammation matters because chronic, low-level inflammation is thought to drive many diseases of later life, from heart disease to frailty and cognitive decline. The process is sometimes called inflammageing.
Kim offered a possible explanation. By helping to reduce this background inflammation, perhaps by preventing reactivation of the virus behind shingles, the vaccine may support healthier ageing. She said the study adds to emerging evidence that vaccines could promote healthy ageing by acting on biological systems beyond preventing infection.
The design of the study limits what it can claim. It was observational, so it cannot prove that the vaccine causes the body to age more slowly. The results may reflect the healthy user effect, in which people who choose to be vaccinated tend to be in better shape, wealthier and more engaged with healthcare in general.
One finding pushes against that explanation, though without settling it. People who had been vaccinated four or more years before their blood was taken still showed slower biological ageing than people who had never been vaccinated. The findings were published in The Journals of Gerontology.
The persistence of the effect is what makes the question worth testing more rigorously, and follow-up trials would be needed to determine whether the jab actually slows ageing.
Citazioni salienti
The study adds to emerging evidence that vaccines could promote healthy ageing by modulating biological systems beyond infection prevention.— Jung Ki Kim, University of Southern California, lead author
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