Researchers from Brown University announced on Mar. 20 the development of a new wound dressing material that releases antibiotic nanoparticles only when harmful bacteria are present. The team said this innovation could help clear wound infections more quickly while reducing unnecessary use of antibiotics, which is a major factor in the rise of antibiotic-resistant infections.
The significance of this research lies in its potential to address the growing problem of antimicrobial resistance. According to the researchers, overuse and misuse of antibiotics contribute to hard-to-treat infections that claim many lives each year worldwide.
The new material is described as a smart hydrogel loaded with an antibiotic cargo. It can be placed directly on wounds under a bandage and is sensitive to an enzyme produced by many types of harmful bacteria. When this enzyme is detected, the hydrogel degrades and releases its antibiotics; otherwise, it remains intact, keeping the medication locked away. “Antimicrobial resistance is a major problem worldwide, so we need better approaches for how we use antibiotics,” said Anita Shukla, professor at Brown’s School of Engineering who led the project. “We’ve developed a material that releases antibiotics only when harmful bacteria are present, so it limits exposure to antibiotics when they’re not needed but still provides these important medications when they are needed.”
In laboratory experiments, the hydrogel was shown to degrade only in the presence of beta-lactamase-producing bacteria—common culprits in wound infections—while remaining stable around harmless bacteria. This selectivity means healthy skin microbiota are less likely to be exposed to unnecessary antibiotics. “This really is a very stable formulation that doesn’t allow the drug to leach out,” Shukla said. “It’s truly trapped in there until there is a significant amount of beta-lactamase production that can cause hydrogel degradation.”
Animal studies demonstrated that a single application could fully eradicate bacterial infection in abrasion wounds and performed better than commonly used antimicrobial dressings both in eradicating bacteria and promoting healing.
The researchers concluded: “Our findings suggest that these bacterial enzyme-responsive smart hydrogels have the potential to provide targeted, on-demand infection eradication while minimizing unnecessary exposure to antibiotics… By releasing the antibiotic only in the presence of beta-lactamase-producing bacteria, our hydrogel system provides effective treatment while minimizing susceptibility to antibiotic resistance.” The team has patented their invention and plans further development toward commercialization.
