A compound long favored in Korean skincare routines for its calming properties could help tackle one of modern medicine's biggest crises: drug-resistant infections that kill hundreds of thousands annually and show no signs of slowing.
Scientists at the University of Kent, working with colleagues at University College London, have identified madecassic acid as a powerful antibacterial agent. The compound, extracted from Centella asiatica, a medicinal herb common throughout Asia, demonstrated the ability to stop antibiotic-resistant E. coli in its tracks during laboratory testing.
The discovery arrives as antibiotic resistance accelerates globally. Experts project antimicrobial-resistant infections could cause 39 million deaths between 2025 and 2050. Creating entirely new antibiotics is costly and slow, making naturally derived compounds an increasingly attractive research avenue.
How It Works Against Resistant Bacteria
The research, published in RSC Medicinal Chemistry, reveals madecassic acid's mechanism is elegant and promising. It binds to the cytochrome bd complex, a protein system bacteria depend on to breathe and survive during infection. This targeting matters enormously because humans and animals lack this complex entirely, meaning the compound could theoretically kill bacteria without harming the patient.
By disrupting this respiratory pathway, madecassic acid essentially suffocates the pathogen. The finding suggests a template for developing antimicrobials that work on entirely different principles than existing antibiotics, potentially circumventing resistance problems that plague current drugs.
The Kent team then took the work further. Researchers extracted madecassic acid from a plant sample sourced in Vietnam and created three modified versions of the compound. Each variant successfully blocked the cytochrome bd complex. One engineered version proved especially potent, actually killing E. coli at higher concentrations rather than merely inhibiting growth.
Dr. Mark Shepherd, the study's lead author, emphasized the broader significance. "Plants have been a source of natural medicines for millennia, and now contemporary research approaches can reveal the mechanisms of action," he said. "This is an exciting time, and we hope to further our understanding of natural antimicrobials from plants, nature's great chemical factories."
Scientists plan to continue refining these compounds to boost their effectiveness and move toward potential clinical applications. The work also opens a secondary line of inquiry into how madecassic acid affects the skin's natural microbial ecosystem when used in cosmetics, potentially illuminating additional biological benefits beyond infection fighting.
Author Jessica Williams: "This is exactly the kind of left-field breakthrough that could matter: taking a skincare darling and discovering it punches at a much heavier weight in the lab."
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