Two Medicinal Plants Show Potent Multi-Enzyme Power Against Skin Aging

Two plants with long histories in traditional medicine are now drawing attention from a very different direction: the laboratory bench where cosmetic and dermatological scientists hunt for molecules that can slow the enzymatic breakdown of human skin. A new study published in The Science of Nature reports that leaf and seed extracts of Adhatoda vasica and Calotropis procera contain compounds capable of inhibiting four key enzymes implicated in skin aging, pigmentation, and the degradation of the extracellular matrix. The work, led by Waseem Ahmed of the Bahamas Agriculture and Marine Science Institute together with Rafia Azmat, Abdul Qayyum, Hadi Abbas, and Mohamed Fawzy Ramadan of Umm Al-Qura University, combines analytical chemistry, enzyme kinetics, and cellular ultrastructure to build a case that these plants deserve a closer look as sources of dermatological actives.

The research team began by isolating and characterizing the bioactive constituents of both plants using ultra-filtration high-performance liquid chromatography coupled with diode-array detection, known as UF-HPLC-DAD, alongside Fourier-transform infrared spectroscopy. This analytical pairing allowed the researchers to identify several distinct molecules within the extracts, including viscic acid, pasakbumin C, a series of 8′Z-enyl congeners, 5-(8′Z,11′Z-heptadecadienyl)-1,3-benzenediol, 9′-(o-methyl) protocetraric acid, and calophynic acid. Each of these compounds belongs to chemical classes known to interact with proteins, and the ultra-filtration step in particular is designed to enrich for ligands that bind target enzymes, giving the team a shortlist of candidates whose biological activity could then be tested directly.

The enzymatic targets chosen for the study read like a checklist of the molecular machinery behind visible skin aging. Tyrosinase, the copper-containing enzyme that catalyzes the first steps of melanin biosynthesis, exists in two catalytic modes: monophenolase activity, which hydroxylates tyrosine, and diphenolase activity, which oxidizes the resulting dihydroxyphenylalanine. Overactive tyrosinase underlies hyperpigmentation disorders such as melasma and age spots. Meanwhile, collagenase and elastase break down collagen and elastin respectively, the structural proteins that give skin its firmness and recoil, and hyaluronidase degrades hyaluronic acid, the glycosaminoglycan responsible for much of the skin’s hydration and volume. Inhibiting all four simultaneously is a multi-target strategy that single-molecule drugs rarely achieve.

The results were striking, particularly for Adhatoda vasica. Leaf extracts of the plant, a shrub widely used in Ayurvedic medicine and commonly known as malabar nut, exhibited potent tyrosinase inhibition, with an IC₅₀ value of 22.16 micrograms per milliliter against the monophenolase reaction and 15.5 micrograms per milliliter against the diphenolase reaction. IC₅₀ values express the concentration of inhibitor needed to halve enzyme activity, so lower numbers indicate stronger inhibition, and values in the low tens of micrograms per milliliter represent meaningful potency for crude plant extracts. Calotropis procera, the so-called apple of Sodom or giant milkweed, also demonstrated significant inhibitory activity against the same enzyme, suggesting that the two plants converge on similar biochemical targets despite their very different phytochemical profiles.

Beyond tyrosinase, both extracts showed appreciable inhibition of collagenase, elastase, and hyaluronidase, along with measurable antioxidant activity. This combination matters because the degradation of the skin’s extracellular matrix is not a single-enzyme event. Matrix metalloproteinases and related hydrolases work in concert, and oxidative stress amplifies their activity by damaging the very structural components they target and by activating inflammatory signaling. An extract that simultaneously restrains several of these enzymes while neutralizing reactive oxygen species could, in principle, offer layered protection against the cumulative damage that manifests as wrinkles, sagging, and loss of skin elasticity. The authors suggest this protective potential extends to guarding the extracellular matrix against enzymatic degradation and oxidative damage more broadly.

To test whether these biochemical effects translate into cellular activity, the team turned to dermal fibroblasts, the cells that synthesize collagen and maintain the dermal scaffold. Cytotoxicity was assessed using lactate dehydrogenase release assays, a standard measure of membrane damage in which the enzyme LDH leaks out of cells whose plasma membranes have been compromised. The assays confirmed concentration-dependent effects, meaning that the extracts’ impact on cell viability changed systematically with dose, an important parameter for any candidate topical ingredient since it defines the window between a therapeutically useful concentration and a harmful one.

The cellular work went further than viability alone. Using scanning and transmission electron microscopy, the researchers examined the ultrastructure of fibroblasts exposed to the extracts and observed distinct morphological changes. These included alterations in cell wall integrity, cytoplasmic organization, and intercellular structure. Electron microscopy at this resolution can reveal subcellular rearrangements that light microscopy misses, and the observed changes indicate that the extracts are genuinely bioactive at the cellular level rather than inert. The authors interpret these findings as evidence of both protective and bioactive cellular effects, though the precise mechanisms linking specific molecules to specific ultrastructural changes remain to be worked out.

The study’s significance lies partly in its methodology. By coupling ligand-targeted analytical chemistry with a panel of enzyme assays and cellular imaging, the researchers moved beyond the simple antioxidant screening that dominates much of the natural products literature. The identification of named compounds such as viscic acid and pasakbumin C provides concrete chemical starting points for follow-up work, whether that involves testing purified molecules individually, exploring structure-activity relationships, or investigating synergy among the extract components. Synergistic action among plant-derived compounds has been proposed as a key reason why whole extracts sometimes outperform isolated single agents against skin-infecting microorganisms and other targets, and the multi-enzyme profile observed here is consistent with a mixture of compounds acting on overlapping pathways.

Both plants carry cultural and pharmacological baggage that any future development would need to address. Adhatoda vasica has been used for centuries in traditional respiratory medicine, while Calotropis procera is known to produce toxic cardenolides and irritant latex, which makes the safety profiling in this study, including the LDH cytotoxicity data, particularly relevant. The concentration-dependent cytotoxicity results suggest that formulation scientists would need to identify the dose range at which enzyme inhibition and matrix protection are achieved without harming fibroblasts. Standardizing extracts to specific active compounds, and potentially removing or minimizing toxic constituents, would be a logical next step toward topical preparations aimed at managing skin disorders and preventing enzymatic skin degradation.

For now, the findings position A. vasica and C. procera as promising sources of bioactive compounds with potential applications in dermatological formulations, from anti-hyperpigmentation treatments to products designed to preserve the structural integrity of aging skin. The work was funded by Umm Al-Qura University in Saudi Arabia under grant number 26UQU4430043GSSR12, and the authors report no competing interests. As with all in vitro studies, the gap between enzyme inhibition in a test tube and clinically meaningful results in human skin is substantial, and the researchers themselves frame the results as a foundation for dermatological applications rather than a demonstration of therapeutic efficacy. Still, in a field where consumers increasingly demand plant-derived actives backed by mechanistic evidence, a study that names its molecules, quantifies its enzyme inhibition, and images its cellular effects offers a template for how traditional medicinal plants can be rigorously evaluated for modern skincare science.

Subject of Research: Natural multi-target enzyme inhibitors from Adhatoda vasica and Calotropis procera for dermal regeneration

Article Title: Natural multi-target inhibitors from Adhatoda vasica and Calotropis procera for dermal regeneration

Article References: Ahmed, W., Azmat, R., Qayyum, A., Abbas, H., & Ramadan, M. F. (2026). Natural multi-target inhibitors from Adhatoda vasica and Calotropis procera for dermal regeneration. The Science of Nature, 113(5), Article 122. https://doi.org/10.1007/s00114-026-02170-8

Image Credits: AI Generated

DOI: 10.1007/s00114-026-02170-8

Keywords: Adhatoda vasica, Calotropis procera, tyrosinase inhibition, collagenase, elastase, hyaluronidase, skin aging, dermal fibroblasts, UF-HPLC, FTIR, natural products, dermatology