Unveiling the Achilles Heel of Antibiotic-Resistant Bacteria: Strategies to Combat Superbugs
Recent estimates indicate that antibiotic-resistant infections will increase significantly in the next 25 years. From 1990 to 2021, over 1 million people died each year from drug-resistant infections. By 2050, projections suggest that nearly 2 million deaths may occur annually.
To address this public health issue, scientists are exploring new solutions in bacterial infection mechanisms. A study led by UC San Diego researchers reveals a weakness in antibiotic-resistant bacteria. The team, including experts from Arizona State University and Universitat Pompeu Fabra in Spain, focused on the bacterium Bacillus subtilis. They aimed to understand why antibiotic-resistant mutants do not dominate their populations.
The research, published in Science Advances, found that antibiotic resistance has a hidden cost. Resistant bacteria, while surviving better under certain conditions, face a physiological limitation that prevents them from becoming the dominant strain. This insight could help in managing the spread of antibiotic resistance.
Professor Gürol Süel described this discovery as finding an “Achilles heel” in antibiotic-resistant bacteria. Researchers can utilize this weakness to inhibit antibiotic resistance without drugs or harmful chemicals.
All bacteria need charged ions, like magnesium, to thrive. Ribosomes require magnesium ions for stability and function. The study showed that resistant ribosome variants compete excessively with adenosine triphosphate (ATP) for magnesium. This competition leads to growth limitations, affecting resistant bacterial strains more than their non-resistant counterparts.
Süel noted that survival under magnesium-limited conditions is crucial for bacterial growth, outweighing the benefits of antibiotic resistance. Targeting this weakness may allow for new strategies to combat antibiotic resistance without toxic substances. Researchers could chelate magnesium ions from regions where bacteria grow, selectively affecting resistant strains while sparing beneficial bacteria.
In addition, Süel’s team at the University of Chicago has developed a bioelectronic device that harnesses the natural electrical activity of skin bacteria. This approach could offer another drug-free method to manage infections, particularly those involving Staphylococcus epidermidis, a common hospital-acquired infection.
Süel emphasized the urgency of finding alternatives to antibiotics, stating that drug-free methods are necessary as traditional antibiotics lose effectiveness. These recent studies show promising paths for controlling antibiotic-resistant bacteria without the need for drugs.
The study authors include Eun Chae Moon, Tushar Modi, Dong-yeon Lee, Danis Yangaliev, Jordi Garcia-Ojalvo, S. Banu Ozkan, and Gürol Süel.