For generations, the story of the heart attack has been told in the language of cholesterol, diet, smoke and pressure, a story of slow accumulation and sudden failure. Now researchers in Finland and the United Kingdom have found that the fatty plaques choking arteries can harbor microbes more often associated with the mouth, a discovery that quietly invites us to reconsider how the body's oldest defenses and its most ordinary neighbors might be entangled in our deaths. Whether this is a cause, a passenger, or a piece of a larger puzzle remains unsettled, but the question has been opened in a w
Mouth Bacteria Found in Arterial Plaques May Help Trigger Heart Attacks, Study Suggests
Tissue from 121 people who died suddenly outside hospital and 96 vascular surgery patients was analyzed in the study.
Bacteria from the mouth, tucked inside the plaques that clog arteries
Mark
Why does finding bacteria in artery plaque matter, if cholesterol was already the explanation?
Mimi
Because it suggests a second ingredient. The plaque may be more dangerous when bacterial biofilms sit inside it and then get disturbed at rupture.
Mark
How many people were looked at?
Mimi
121 who died suddenly outside hospital, and 96 vascular surgery patients. Bacterial DNA showed up in nearly half, and viridans streptococci were the most common, at 42% and 43%.
Luke
Let me slow that down. Finding DNA in plaque is not the same as showing the bacteria caused the heart attacks.
Mimi
Fair. The authors describe a strong correlation and say the findings support an infection hypothesis. That is supportive language, not proof.
Mark
What about the lab work?
Mimi
Viridans streptococci were shown to activate TLR2, a pathway that fuels inflammation. That gives a plausible mechanism.
Luke
Plausible, yes. But the article doesn't say whether the bacteria were the cause or simply present in damaged tissue.
Mark
And the antibiotic question?
Mimi
It is listed as an open question. Nothing here shows antibiotics prevent heart attacks.
Luke
Same for the hygiene advice. The study suggests oral care might matter more, but the article offers no data showing brushing lowers risk.
Il Polso
- Bacterial DNA turned up in nearly half of 217 arterial samples, unsettling the familiar explanations for heart attacks.
- Viridans streptococci, a mouth-dwelling family, appeared in roughly 42% of coronary plaques and 43% of surgical samples.
- The bacteria hide in sticky biofilms, slipping past the immune system while the plaque quietly grows.
- When plaques rupture, bacterial fragments ignite inflammation through TLR2, a pathway that may push the artery toward sudden failure.
- Researchers now press for answers on whether antibiotics, better diagnostics or biofilm-targeting therapies could prevent fatal ruptures, but no trials have yet proven any of them.
For generations, the story of the heart attack has been told in the language of cholesterol, diet, smoke and pressure, a story of slow accumulation and sudden failure. Now researchers in Finland and the United Kingdom have found that the fatty plaques choking arteries can harbor microbes more often associated with the mouth, a discovery that quietly invites us to reconsider how the body's oldest defenses and its most ordinary neighbors might be entangled in our deaths. Whether this is a cause, a passenger, or a piece of a larger puzzle remains unsettled, but the question has been opened in a way that cannot easily be closed again.
Researchers in Finland and the United Kingdom have examined arterial tissue from 217 people and found bacteria that normally live in the mouth, lodged inside the fatty plaques that clog arteries. The samples came from 121 people who died suddenly outside a hospital and 96 patients who had undergone vascular surgery. Bacterial DNA appeared in nearly half of them, and viridans streptococci, the family linked to dental plaque and gum infections, were the most common find.
The study, published in the Journal of the American Heart Association, argues that these microbes do not simply drift through the artery. They form biofilms within the plaque, where they hide from the immune system. When a plaque ruptures, bacterial fragments are released and trigger a strong inflammatory response through TLR2, a signaling pathway that can destabilize the artery wall and precipitate a heart attack.
The authors say their results support an infection hypothesis for heart attacks, though many questions remain. Could antibiotics reduce risk? Could biofilms be detected or treated? None of this has been tested yet. The findings also lend new weight to oral hygiene, suggesting that caring for the mouth may matter more for the heart than was once believed.
Researchers in Finland and the United Kingdom have examined arterial tissue from 217 people and found something that sits awkwardly beside the usual account of heart attacks: bacteria that normally live in the mouth, tucked inside the fatty plaques that clog arteries.
For decades the explanations for heart attacks have been familiar ones: cholesterol buildup, poor diet, smoking, high blood pressure. The new study, published in the Journal of the American Heart Association, suggests that oral bacteria, in particular a group called viridans streptococci, may play a hidden part in the development of atherosclerosis and in fatal heart attacks.
The samples came from two groups. One was coronary plaque taken from 121 people who died suddenly outside a hospital. The other was artery tissue from 96 patients who had undergone vascular surgery. Bacterial DNA turned up in nearly half of all the cases. Viridans streptococci, the same family of microbes associated with dental plaque and gum infections, were the most common finding, present in 42% of the coronary plaques and 43% of the surgical samples.
How the bacteria behave once inside the artery is the central claim. According to the study, they do not drift freely. They form biofilms, sticky colonies embedded deep within the plaque, where they can evade detection by the body's immune system. The trouble comes when a plaque ruptures. Fragments of bacteria are released and set off a strong immune response, and the resulting inflammation can destabilize the artery wall, leading to the sudden rupture that precipitates a heart attack.
Laboratory testing added a mechanism. The researchers confirmed that viridans streptococci activate toll-like receptor 2, known as TLR2, a bacterial signaling pathway that drives inflammation within arteries. The authors wrote that their findings support the infection hypothesis of myocardial infarction, and they point to a strong correlation between the presence of bacteria, severe atherosclerosis and deaths from coronary heart disease.
The work raises practical questions that remain open. Could antibiotics given during a heart attack reduce risk? Could future diagnostic tools detect bacterial biofilms inside arteries? Might new therapies target those biofilms directly to prevent fatal ruptures? None of these has been answered by this study.
The findings also bring oral hygiene into a new light. Brushing and flossing may seem far removed from heart health, but the results suggest that caring for the mouth could matter more for preventing cardiovascular disease than was previously thought. The researchers conclude that chronic bacterial biofilms may quietly turn otherwise stable plaques into ones prone to rupture, a link between gum disease and heart disease that science is only beginning to unravel. What to watch next is whether trials test antibiotic or biofilm-targeting approaches.
Citazioni salienti
Our findings support the infection hypothesis of myocardial infarction.— Study authors
Vuoi la storia completa?
Leggi l'originale su The Economic Times ↗
General News