The research team, led by scientists at Guangxi Medical University and the Guangxi Academy of Sciences, prepared an ethyl acetate extract of perilla leaves, a fraction enriched for the plant’s flavonoids and other secondary metabolites. Perilla frutescens is classified in China as a traditional medicine and food homologous plant, meaning it occupies the unusual dual status of being both a therapeutic agent and an everyday ingredient. Its leaves are packed with antioxidant compounds, and previous work has catalogued an impressive chemical repertoire including rosmarinic acid, luteolin, apigenin, and various terpenoids. What remained unclear was whether these compounds could meaningfully influence the biology of aging, and if so, by what mechanism.

To answer that question, the researchers turned to C. elegans, a nematode worm about one millimeter long that shares a startling degree of genetic conservation with humans. Many of the genes that control longevity in worms, including the insulin/IGF-1 signaling pathway at the heart of this study, have direct counterparts in human cells. Because worms live only a few weeks, age rapidly, and can be manipulated genetically with precision, they allow researchers to test lifespan interventions that would take decades to evaluate in mammals. When the worms were fed the perilla extract, the results were striking: their lifespans were significantly prolonged compared with untreated controls.

Longevity alone is not necessarily desirable if the extra time is spent in frailty, so the team also measured healthspan markers. Treated worms showed enhanced pharyngeal pumping, the rhythmic contraction that drives feeding and serves as a proxy for neuromuscular vitality, as well as increased head thrashing frequency, a measure of motility and muscular vigor. Both metrics suggest that the extract did not merely keep the worms alive longer but preserved their functional capacity into old age. The animals also accumulated less lipofuscin, the pigment-rich cellular debris that builds up in aging tissues and is widely used as a microscopic clock of biological age in these organisms.

A central thread of the study concerns oxidative stress, one of the canonical hallmarks of aging. Reactive oxygen species, or ROS, are chemically reactive molecules generated as byproducts of metabolism that can damage DNA, proteins, and lipids. Aging organisms lose the ability to neutralize these molecules efficiently, and the resulting damage accumulates over time. In the treated worms, ROS levels dropped markedly, and the activity of antioxidant enzymes rose. The researchers also measured malondialdehyde, or MDA, a well-established marker of lipid peroxidation, essentially the chemical rancidity of cell membranes, and found it reduced following extract treatment.

The worms’ stress resilience extended beyond their internal chemistry. When exposed to elevated temperatures, perilla-treated nematodes survived better than controls, indicating enhanced thermotolerance. They also withstood exposure to juglone, a compound deliberately used in the laboratory to induce severe oxidative stress. This dual protection against heat and chemical insult suggests that the extract activates a broad, coordinated stress-response program rather than a narrow defense against a single threat. In the language of biogerontology, the extract behaves like a nutritional hormetin, a mild stressor or bioactive compound that triggers adaptive, protective responses that ultimately benefit the organism, echoing the principle of hormesis in which a little stress makes the system stronger.

Perhaps the most visually dramatic finding involved fat. The treated worms stored markedly less lipid than their untreated counterparts, pointing to a genuine lipid-lowering effect. Fat metabolism and longevity are deeply intertwined in C. elegans, where lipid droplets serve not only as energy reservoirs but also as signaling hubs that influence aging. The interplay is complex, since some lipid species protect against age-related decline while excess storage is associated with shorter lifespans and metabolic dysfunction. The finding that a plant extract can reprogram lipid metabolism while simultaneously extending life makes perilla an intriguing candidate for further investigation as a nutraceutical, a food-derived compound with medicinal properties.

Mechanistically, the study traced these effects to the insulin/IGF-1 signaling pathway, one of the most intensively studied longevity circuits in biology. In worms, reducing signaling through this pathway triggers a cascade that activates DAF-16, the worm ortholog of the FOXO family of transcription factors, which then translocates to the nucleus and switches on an army of protective genes. The researchers found that the perilla extract activated this pathway and upregulated both DAF-16/FOXO and SKN-1, the worm equivalent of the mammalian Nrf2 transcription factor that masterminds antioxidant defenses. Consistent with this activation, downstream stress-response genes including sod-3, which encodes a superoxide dismutase enzyme, gst-4, a glutathione S-transferase, and hsp-16.2, a heat shock protein, all showed increased expression.

The upregulation of glutathione-related machinery is particularly noteworthy. Glutathione is the cell’s principal endogenous antioxidant, a tripeptide that mops up reactive molecules and maintains the cellular redox balance, and its depletion is implicated in aging and neurodegenerative disease. By enhancing glutathione metabolism alongside the DAF-16 and SKN-1 programs, the extract appears to reinforce the worm’s antioxidant architecture at multiple levels simultaneously. The authors also observed a reprogramming of lipid metabolism, suggesting that the extract coordinates metabolic and stress-response systems rather than acting on a single target, a multicomponent mode of action consistent with the behavior of complex botanical extracts rich in flavonoids and terpenoids.

The findings position perilla leaf extract as a promising candidate in the growing field of nutritional interventions against aging, though important caveats remain. The work was conducted entirely in nematodes, and many compounds that extend worm lifespan fail to translate to mammals, let alone humans. Dosing, bioavailability, and the identity of the specific active molecules within the extract all require further study. Nevertheless, the convergence of extended lifespan, improved physical function, reduced fat accumulation, and a clearly defined molecular mechanism centered on the insulin/IGF-1 pathway, DAF-16, and SKN-1 gives the results unusual coherence for a botanical study. As the search for safe, food-derived compounds that promote healthy aging intensifies, the leafy green herb on the sushi plate has earned a place in the conversation.

Subject of Research: Lifespan extension and lipid-lowering effects of Perilla frutescens leaf extract via insulin/IGF-1 signaling in Caenorhabditis elegans

Article Title: Perilla frutescens extract reduces fat accumulation and promotes longevity in Caenorhabditis elegans via modulation of the insulin/IGF-1 signaling pathway

Article References: Huang, L., Yin, F., Fu, X., Huang, Y., Tang, Y., Liao, G., Wang, B., Yang, T., Huang, G., & Chen, X. (2026). Perilla frutescens extract reduces fat accumulation and promotes longevity in Caenorhabditis elegans via modulation of the insulin/IGF-1 signaling pathway. Biogerontology, 27(5), Article 168. https://doi.org/10.1007/s10522-026-10507-z

Image Credits: AI Generated

DOI: 10.1007/s10522-026-10507-z

Keywords: Perilla frutescens, Caenorhabditis elegans, lifespan extension, insulin/IGF-1 signaling, DAF-16/FOXO, SKN-1/Nrf2, oxidative stress, lipid metabolism, flavonoids, hormesis, nutraceutical, biogerontology

The appeal of plant polysaccharides in aging research lies partly in their safety profile. Unlike synthetic pharmacological candidates such as rapamycin or metformin, which raise long-term safety and dosing questions for otherwise healthy people, polysaccharides are typically low in toxicity and highly biocompatible. Yet their mechanisms have remained stubbornly opaque. The new study set out to close that gap by testing whether polysaccharides from P. macroceras, abbreviated PMP by the researchers, could delay aging without compromising growth, feeding, or reproduction — a critical distinction, since simply poisoning an organism or starving it can also lengthen life at a devastating cost to vitality.

Across the experiments, PMP delivered a coherent anti-aging signature. Supplemented worms and flies lived longer than untreated controls, and importantly, the extra days were healthy ones. Treated animals retained better locomotor performance, preserved physiological fitness, and did not suffer measurable harm to feeding behavior or reproductive output. This combination — lifespan extension alongside maintained healthspan — is the benchmark that gerontologists look for when judging whether a compound is a true aging modulator rather than a narrow toxicological artifact. The researchers also observed that PMP-treated animals withstood a range of environmental stresses more effectively than their peers, a hallmark of enhanced cellular resilience.

Zooming into the cell, the study documented the biochemical details of that resilience. Aging tissues accumulate reactive oxygen species, the chemically unstable byproducts of metabolism that damage DNA, proteins, and membranes. Aging is also marked by the failure of proteostasis, the cellular system that folds, repairs, and disposes of proteins, allowing damaged molecules and aggregates to pile up. In PMP-supplemented animals, intracellular reactive oxygen species accumulation dropped, the age-pigmented waste product lipofuscin accumulated more slowly, and polyglutamine protein aggregation — the same class of clumping implicated in Huntington’s disease — was attenuated. Redox balance and protein homeostasis, two pillars of cellular youth, were thus demonstrably shored up.

The mechanistic core of the paper concerns two transcription factors that sit at the top of animal longevity networks. In C. elegans, DAF-16 is the worm equivalent of the mammalian FOXO family, a set of transcription factors long known to govern lifespan in response to insulin-like signaling. SKN-1 is the worm’s version of Nrf2, the master regulator of antioxidant and detoxification gene expression in animals from worms to humans. The study found that PMP treatment enhanced signaling through both pathways, and that this activation propagated downstream: levels of the antioxidant enzymes SOD-3, a superoxide dismutase, and GST-4, a glutathione S-transferase, increased in treated animals. In other words, the compound did not merely mop up free radicals chemically; it appeared to switch on the animals’ own genetic antioxidant defense programs.

This distinction matters for how the research community interprets the result. Many antioxidant molecules fail in translation because scavenging reactive species directly is a blunt instrument that can interfere with the beneficial signaling roles these molecules play. Compounds that instead engage the Nrf2 and FOXO transcriptional circuitry, prompting cells to upregulate their own coordinated defensive machinery, are considered more plausible candidates for safe intervention. The authors frame PMP within this mechanistic tradition, connecting it to a body of work in which other plant polysaccharides — from species including Lycium barbarum, Dendrobium officinale, Angelica sinensis, and lentinan-producing mushrooms — have been shown to act on the same conserved pathways.

Beyond oxidative stress and proteostasis, the study reached into metabolism, an increasingly central theme in aging biology. Using metabolic profiling, the researchers found that PMP alleviated age-associated metabolic disturbances, modulating amino acid metabolism, carbohydrate metabolism, and energy metabolism in treated animals. Metabolic drift — the gradual erosion of the finely tuned balance of metabolites that sustains physiological function — is one of the quiet engines of aging, and interventions that preserve this homeostasis are thought to support the entire edifice of healthspan. The finding suggests PMP’s effects are systemic rather than confined to a single stress-response module, coordinating longevity signaling, stress resistance, and metabolic regulation simultaneously.

The choice of two model organisms strengthens the case considerably. C. elegans, a millimeter-long soil nematode, and Drosophila melanogaster, the vinegar fly, separated by hundreds of millions of years of evolution, nevertheless share the core signaling modules that control aging, including insulin/IGF-1 signaling, FOXO transcription factors, and Nrf2-type stress responses. When a compound produces consistent, mechanistically aligned effects in both species, the probability that the finding reflects a general biological principle rather than a quirk of one organism’s physiology rises sharply. It also builds confidence for the long road toward mammalian studies, where any putative anti-aging intervention must ultimately prove itself.

The work also carries conservation and ethnopharmacology dimensions. Pausinystalia macroceras grows in the forests of Central Africa, where its relative Pausinystalia johimbe has long been harvested for bark containing yohimbine. The present study shifts attention from the tree’s alkaloids to its polysaccharides, high-molecular-weight carbohydrates whose biological activities in aging contexts are only beginning to be catalogued. If such compounds continue to demonstrate longevity benefits with minimal toxicity, they could become attractive starting points for nutraceutical or functional food development — though the researchers and the field at large are careful to note that effects in worms and flies do not guarantee equivalent outcomes in humans, and that the dose-response relationships, bioavailability, and long-term safety of PMP remain to be established.

For now, the study offers something the aging research community prizes: a natural molecule, a reproducible phenotype across species, and a plausible molecular mechanism anchored in the DAF-16/FOXO and SKN-1/Nrf2 axes, with downstream antioxidant, proteostatic, and metabolic consequences. As the global population ages and the burden of age-related disease grows, the search for interventions that extend not just lifespan but healthspan has become a research priority. Compounds like PMP — drawn from traditional botanical sources, interrogated with modern molecular genetics, and validated across evolutionary distant models — represent one of the most active frontiers in that search. The next steps, extending this work into vertebrate systems and dissecting the structure-activity relationships of the polysaccharides themselves, will determine whether the modest worm and fly in the laboratory have once again pointed the way toward something medically meaningful.

Subject of Research: Aging-modulatory effects of Pausinystalia macroceras polysaccharides acting through DAF-16/FOXO and SKN-1/Nrf2 signaling in C. elegans and Drosophila aging models

Article Title: Aging-modulatory effects of Pausinystalia macroceras (K. Schum.) Pierre polysaccharides are associated with DAF-16/FOXO and SKN-1/Nrf2 signaling in multiple aging models

Article References: Aging-modulatory effects of Pausinystalia macroceras (K. Schum.) Pierre polysaccharides are associated with DAF-16/FOXO and SKN-1/Nrf2 signaling in multiple aging models. (n.d.). https://doi.org/10.1007/s10522-026-10509-x

Image Credits: AI Generated

DOI: 10.1007/s10522-026-10509-x

Keywords: Pausinystalia macroceras, polysaccharides, aging, longevity, DAF-16/FOXO, SKN-1/Nrf2, Caenorhabditis elegans, Drosophila melanogaster, oxidative stress, proteostasis, healthspan, antioxidant defense