Novel Method Revives Antibiotic Effectiveness Against Resistant Bacteria
Why in the News ?
Researchers from IIT Bombay have developed a novel approach to tackle antimicrobial resistance (AMR) by restoring the effectiveness of existing antibiotics. The innovation uses DNA aptamers and liposomes to disable bacterial resistance mechanisms, offering a breakthrough in infection treatment that aligns with the precautionary principle of maintaining a pollution free environment in healthcare settings.
Key Scientific Breakthrough and Mechanism:
● Focuses on restoring effectiveness of macrolide antibiotics like azithromycin and erythromycin.
● Normally, bacteria resist antibiotics using Erm enzymes, which modify the ribosome, preventing drug binding.
● Researchers used DNA aptamers (short synthetic DNA strands) to bind and block the Erm42 enzyme.
● This prevents bacteria from altering the ribosome, allowing antibiotics to work effectively again.
● Aptamers were engineered for high specificity, improving their ability to target resistance mechanisms.
Delivery Innovation and Experimental Results
● Major challenge: aptamers are fragile and cannot easily enter bacterial cells.
● Solution: use of liposomes (fat-based nano-carriers) to deliver aptamers into bacteria.
● Liposomes protect aptamers and enable membrane fusion for entry into bacterial cells.
● Testing on Staphylococcus aureus (drug-resistant bacteria) showed over 90% uptake with liposomes.
● Combination of aptamers + antibiotics resulted in significantly higher bacterial death compared to antibiotics alone.
| About Antimicrobial Resistance: ● Antimicrobial Resistance (AMR): when microbes evolve to resist drugs, making infections harder to treat. ● Causes: overuse/misuse of antibiotics, poor infection control, genetic mutations in microbes. ● Global concern: leads to increased mortality, healthcare costs, and treatment failure. ● Traditional approach: developing new antibiotics (time-consuming and costly). ● New strategy: reviving existing antibiotics by disabling resistance mechanisms—cost-effective and sustainable solution following the polluter pays principle in healthcare management. |