Urolithin A reveals how a microbiota derived polyphenol metabolite can directly target cellular signaling and opens new perspectives for polyphenol applications
For decades, the health effects of polyphenols have been largely explained by their antioxidant activity. A new study published in Science Advances suggests a much more precise mechanism.
Joseph R. Burgoyne and colleagues show that urolithin A, a gut microbiota derived metabolite of ellagitannins and ellagic acid, directly modifies Cys42 of PKGIα, a redox sensitive protein involved in vascular and cardiac relaxation.
This is not simply free radical scavenging. It is direct molecular target engagement.
In an experimental model of heart failure with preserved ejection fraction (HFpEF), urolithin A improved diastolic function, reduced cardiac remodeling and fibrosis, and increased exercise capacity. Importantly, much of this protection disappeared when Cys42 was replaced by a redox insensitive residue.
The researchers also demonstrated improved contraction and relaxation kinetics in engineered human heart tissue, providing an important translational bridge, although clinical validation is still needed.
Why does this matter for polyphenol science?
Urolithin A illustrates two major changes in our understanding of polyphenols.
First, the biologically active molecule may not be the polyphenol we consume, but a metabolite generated by the gut microbiota.
Second, its action may depend less on general antioxidant capacity and more on specific molecular targets and redox signaling.
The emerging pathway is therefore:
Polyphenols → Microbiota → Metabolites → Molecular Targets → Biological Effects
This could reshape future applications, moving the field toward mechanism based ingredients, biomarkers, microbiota dependent responses and more personalized nutritional strategies.
At Polyphenols Applications 2026, October 8–9 in Málaga, we want to address this transition directly:
Beyond antioxidants, what are the real molecular mechanisms driving the health effects of polyphenols?
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A natural flavonoid reveals new perspectives for targeting cellular senescence and age-related diseases
Cellular senescence is increasingly recognized as a major driver of aging, chronic inflammation and age-related diseases. A recent study published in Nature Communications suggests that a natural flavonoid could act directly on this fundamental biological process.
Researchers led by Professor Yu Sun identified dihydromyricetin as a natural compound with senotherapeutic potential. Rather than producing a single effect in every senescent cell, the flavonoid appeared to act differently depending on the cellular context.
In senescent fibroblasts, dihydromyricetin reduced the pro-inflammatory senescence-associated secretory phenotype and limited further DNA damage. The researchers linked this effect to peroxiredoxin 2, or PRDX2, which was transported into the nucleus and supported DNA-repair mechanisms. In this context, the compound acted primarily as a senomorphic agent, modifying the harmful behaviour of senescent cells without necessarily eliminating them.
In senescent microglial cells, however, dihydromyricetin impaired mitochondrial function and promoted apoptosis, producing a senolytic effect. In mouse models of Alzheimer’s disease, the treatment reduced senescent microglial cells around amyloid plaques and improved neurodegenerative outcomes.
The compound also reduced tissue-aging phenotypes in prematurely aged mice and improved the effects of chemotherapy in experimental cancer models. These findings position dihydromyricetin as a potential multifunctional senotherapeutic agent acting across DNA repair, inflammation, mitochondrial function and cellular survival.
The results remain preclinical and do not yet demonstrate that dihydromyricetin can prevent or treat age-related diseases in humans. Nevertheless, the study opens an important perspective for polyphenol research:
Could polyphenols be developed as precision agents that suppress, reprogram or selectively eliminate senescent cells?
This emerging direction will be discussed during Polyphenols Applications 2026, taking place on October 8–9, 2026, in Málaga, Spain, where researchers will explore how polyphenols are moving beyond their classical antioxidant role toward targeted applications in healthy aging and disease prevention.
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A rosmarinic acid–based nanoplatform targets oxidative stress, inflammation and ocular-surface damage
Dry-eye disease is more than insufficient tear production. It involves a self-perpetuating cycle of oxidative stress, inflammation and epithelial injury, while conventional eye drops are often limited by rapid clearance from the ocular surface.
A recent study by Zixin Wang, Zeen Lv, Yuxuan Ge, Ruiyang Xue, Fang Wu, Haijie Han, Yin Wang and colleagues, published in Nature Communications, introduces a new approach based on a polyphenol-derived therapeutic platform.
The researchers used rosmarinic acid, a natural polyphenol, as both a bioactive compound and a structural component. Through self-polymerization in the presence of hyaluronic acid, followed by assembly with cerium ions, they produced multifunctional nanoparticles designed for use as eye drops. Thiol groups were then added to improve adhesion to the mucus-covered ocular surface and prolong local retention.
This design addresses several mechanisms simultaneously:
- Scavenging reactive oxygen species;
- Suppressing ocular inflammation;
- Supporting corneal epithelial repair;
- Improving tear secretion;
- Extending contact with the eye surface.
In two mouse models of dry-eye disease, topical administration reduced inflammation, repaired corneal epithelial defects and restored tear production. The results remain preclinical, but they demonstrate how a natural polyphenol can be transformed into an engineered therapeutic material rather than used only as a conventional antioxidant ingredient.
The study raises a broader question for polyphenol science:
Can polyphenols become the building blocks of next-generation precision therapies?
This new direction-from natural bioactive molecules to functional biomaterials and targeted delivery systems—will be highlighted at Polyphenols Applications 2026, taking place on October 8–9, 2026, in Málaga, Spain.
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Prediabetes represents a critical window during which nutritional interventions may help restore metabolic balance before type 2 diabetes becomes established.
A randomized, double-blind, placebo-controlled clinical trial investigated TOTUM-63, a standardized plant-based combination rich in polyphenols, in participants with prediabetes or recently diagnosed type 2 diabetes who were not receiving glucose-lowering medication.
After six months, participants receiving TOTUM-63 showed improvements in fasting blood glucose and glucose tolerance compared with placebo. The intervention was also associated with favourable changes in body weight, waist circumference, blood lipids and blood pressure.
The study is important because it moves polyphenol research beyond isolated compounds and laboratory models. It evaluates a standardized combination of plant bioactives in a clinically relevant population and addresses a major question:
Can polyphenol-rich interventions complement lifestyle strategies during the early stages of metabolic disease?
The findings suggest that carefully characterized polyphenol combinations could contribute to future nutritional approaches for improving glucose regulation. However, larger and longer clinical trials are still required to determine whether these metabolic improvements can meaningfully delay or prevent progression to type 2 diabetes.
This research also highlights a central theme of Polyphenols Applications 2026: translating the biological complexity of polyphenols into standardized, measurable and clinically relevant applications.
These questions will be discussed during the 19th World Congress on Polyphenols Applications, taking place on October 8–9, 2026, in Málaga, Spain.
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For years, research has shown that dietary polyphenols influence the gut microbiome. A new study published in Food & Function, led by Stephanie M. G. Wilson and senior author Danielle G. Lemay, goes one step further: regular consumption of polyphenol-rich foods appears to increase the gut microbiome’s functional capacity to metabolize polyphenols.
Researchers from the University of California, Davis, the USDA Western Human Nutrition Research Center, and Texas A&M University analyzed dietary records and shotgun metagenomic sequencing data from 313 healthy adults. Instead of simply examining which bacteria were present, they investigated whether gut microbes carried genes specifically dedicated to breaking down polyphenols, known as Polyphenol Utilization Proteins (PUPs).
Their findings challenge a common assumption.
A higher intake of polyphenols did not significantly change the overall composition or diversity of the gut microbiome. Instead, it changed what the microbiome was capable of doing.
The researchers identified 117 significant associations between dietary polyphenols and microbial genes involved in polyphenol metabolism. Nearly three-quarters of these associations involved enzymes responsible for hydrolysis—the first critical step that releases bioactive polyphenols from their food matrix, making them available for absorption and further metabolism.
Interestingly, consuming a greater diversity of polyphenol-rich foods was associated with a greater diversity of these metabolic genes, suggesting that dietary variety may “train” the microbiome to process a broader range of plant compounds.
The study also identified specific relationships between citrus polyphenols such as naringin and hesperidin and beneficial bacterial genera including Lachnospira and Gordonibacter. In addition, olive-derived polyphenols were associated with higher abundance of Bacteroidales, bacteria known to produce a less inflammatory form of lipopolysaccharide (LPS).
Although the study was observational and cannot establish cause and effect, it reinforces an emerging concept in nutrition science: the health effects of polyphenols depend not only on what we eat, but also on whether our gut microbiome has developed the enzymatic machinery to transform these compounds into beneficial metabolites.
Rather than asking, “How many polyphenols do you consume?”, the next generation of nutrition research may ask an even more important question:
Is your microbiome equipped to use them?
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Can the foods children eat today influence their cardiometabolic health for decades to come?
A new review published in Frontiers in Nutrition suggests that dietary polyphenols may become an important component of future strategies to prevent pediatric obesity and its long-term complications.
Pediatric obesity is now recognized as one of the most urgent public health challenges worldwide. Beyond excess body weight, it is associated with early insulin resistance, dyslipidemia, hypertension, endothelial dysfunction, chronic low-grade inflammation, and alterations of the gut microbiota that may persist into adulthood.
The authors review current evidence showing that polyphenols naturally abundant in fruits, berries, vegetables, legumes, cocoa, tea, whole grains, and extra virgin olive oil can simultaneously target several biological pathways involved in cardiometabolic disease.
According to the review, polyphenols may:
- Reduce oxidative stress through activation of the Nrf2 antioxidant pathway.
- Limit chronic inflammation by regulating NF-κB signaling and inflammatory cytokines.
- Improve insulin sensitivity and glucose metabolism through AMPK and PI3K/Akt pathways.
- Support endothelial function and healthier lipid metabolism.
- Remodel the gut microbiota, increasing beneficial bacteria such as Akkermansia and Bifidobacterium while promoting short-chain fatty acid production.
One of the most important conclusions is that food matters more than supplements. Current pediatric evidence favors dietary patterns naturally rich in polyphenols especially the Mediterranean diet rather than isolated polyphenol supplementation. Clinical studies consistently associate these diets with lower adiposity, improved lipid profiles, reduced blood pressure, and better overall cardiometabolic health in children and adolescents, although larger randomized trials are still needed before specific recommendations can be made.
The review also highlights the growing importance of the microbiota. Many health benefits attributed to polyphenols may actually depend on how gut microbes transform these compounds into bioactive metabolites, opening new opportunities for precision nutrition in children.
The message is increasingly clear: promoting polyphenol-rich dietary habits early in life may represent one of the safest and most promising approaches to reducing future cardiometabolic disease.
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A fascinating pilot study published in Foods by researchers from Shibaura Institute of Technology, Japan proposes a new way to evaluate polyphenols not only through their chemical structure and biological activity, but also through their sensory properties.
The study, led by Prof. Naomi Osakabe, with Hitomi Nakamura and Moeka Ogata, developed a trained sensory evaluation system linking polyphenol structures with bitterness, acidity, and astringency.
The researchers focused on four representative polyphenols:
- Gallic acid - associated with strong acidity
- EGCG - linked to pronounced bitterness and mild astringency
- Procyanidin-rich cocoa fraction - marked by intense astringency
- Quercetin hydrate - showing little detectable taste, likely due to low water solubility
Polyphenols are often discussed in terms of antioxidant capacity, bioavailability, microbiota interactions, and health effects. Yet consumer acceptance remains one of the major barriers to the successful development of polyphenol-rich foods, beverages, and nutraceuticals.
By understanding how molecular structures influence taste, manufacturers may be able to improve palatability while preserving beneficial health properties. This could support the design of functional foods and beverages with targeted sensory effects that encourage healthier dietary habits.
Another important aspect is that taste receptors are not limited to the mouth. Bitter and astringent compounds may interact with receptors in the digestive system, influencing hormone release, glucose regulation, and gastrointestinal function. Understanding the sensory characteristics of polyphenols may therefore help explain part of their health-promoting effects.
The key question is no longer only:
“Which polyphenols are most bioactive?”
But also:
“Which polyphenols can consumers realistically consume and enjoy over the long term?”
This is exactly the type of question we will discuss during Polyphenols 2026. As the field moves toward precision nutrition and personalized interventions, we need to better connect molecular mechanisms, sensory science, consumer behavior, microbiome interactions, and clinical outcomes.
The future of polyphenol research may depend as much on taste and adherence as on molecular mechanisms.
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A new study led by Sonia de Pascual-Teresa and her team at the Instituto de Ciencia y Tecnología de Alimentos y Nutrición (ICTAN-CSIC), Spain, highlights the cardiovascular benefits of regular cocoa flavanol and red berry anthocyanin consumption through microbiota modulation.
The research involved a 12-week randomized trial with 60 healthy adults (ages 45–85) consuming daily doses of cocoa (2.5 g), red berries (5 g), or a combination (7.5 g). The study assessed key cardiovascular biomarkers such as homocysteine, nitric oxide (NO), blood pressure, flow-mediated vasodilation (FMD), and lipid profile, alongside microbiota-related metabolites like short-chain fatty acids (SCFA), secondary bile acids (SBA), and trimethylamine N-oxide (TMAO).
Key Findings
- Cocoa intake significantly reduced TMAO levels (p = 0.03) and uric acid (p = 0.01), while improving FMD (p = 0.03) and total polyphenol levels (p = 0.03).
- Increased carbohydrate fermentation in both cocoa and red berry groups (p = 0.04) correlated with lower blood pressure (p = 0.01) and TC/HDL ratio (p = 0.01).
- The results highlight the gut-heart connection, where microbiota modulation contributes to improved cardiovascular function.
Implications for Healthy Aging
The findings support polyphenol-rich foods as a natural and sustainable strategy to enhance cardiovascular health and longevity through gut microbiota interactions.
Join Dr. Sonia de Pascual-Teresa at Polyphenols Applications 2025, where she will present on " Polyphenol-Rich Foods as a Healthy and Sustainable Strategy for Healthy Aging. "
Image Credits: Freepik.com
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A recent study published in Nature Microbiology explores the relationship between coffee consumption and the human gut microbiome. Researchers found a significant association between coffee intake and the presence of Lawsonibacter asaccharolyticus, a bacterial species recently isolated from the human intestine (Nature Microbiology, 2024).
Key Findings
- Association with Lawsonibacter asaccharolyticus: Higher coffee consumption correlates with increased levels of this specific gut bacterium.
- Microbiome diversity: Regular coffee drinkers exhibit greater gut microbial diversity compared to non-drinkers.
- Potential health implications: The presence of L. asaccharolyticus may influence metabolic processes and overall gut health, though further research is needed to understand the mechanisms involved.
Conclusion
These findings suggest that coffee consumption may positively influence gut microbiome composition, particularly by promoting the growth of beneficial bacteria such as Lawsonibacter asaccharolyticus. Notably, L. asaccharolyticus has been identified as a butyrate-producing bacterium (Sakamoto et al., 2018). Butyrate plays a crucial role in gut health by serving as an energy source for colonocytes, enhancing intestinal barrier function, and exhibiting anti-inflammatory properties. Therefore, the increased abundance of this bacterium linked to coffee consumption may have broader beneficial effects on gut physiology.
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A new study by Antonio González-Sarrías and Juan Carlos Espín from CEBAS-CSIC sheds light on the potential of milk-derived exosomes (EXOs) to improve the bioavailability and bioactivity of resveratrol (RSV), a polyphenol known for its anticancer properties. Here’s a summary of the key findings:
- Encapsulation in Exosomes: RSV is efficiently encapsulated in EXOs, protecting it from phase II metabolism, which normally limits its bioactivity.
- Improved Brain Delivery: Pharmacokinetic analysis in rat models revealed that EXO-RSV crosses the blood-brain barrier (BBB) more effectively than free RSV.
- Increased Antiproliferative Effects: EXO-RSV showed stronger antiproliferative activity on human cancer cells (neuroblastoma SH-SY5Y and glioblastoma U-87MG) compared to free RSV, which had limited effects after 72 hours.
- Reduced Metabolism: EXO-RSV resulted in lower levels of phase II-derived metabolites in circulation, further improving its potential for therapeutic use.
These findings suggest that milk-derived exosomes could be a promising nanocarrier for delivering RSV to the brain, enhancing its potential in treating neurodegenerative diseases and cancer.
We are excited to announce that Antonio González-Sarrías will be a speaker at the 18th World Congress on Polyphenols Applications in Malta, on October 2-3, 2025, where he will share his insights into this groundbreaking research.
Image Credits: María Ángeles Ávila-Gálvez, Beatriz Garay-Mayol, Juan Antonio Giménez-Bastida, María del Carmen López de las Hazas, Carmen Mazarío-Gárgoles, Maria Alexandra Brito, Alberto Dávalos, Juan Carlos Espín, Antonio González-Sarrías, Journal of Agriculture and Food Research (2024)
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