Inhibition of methicillin-resistant <i>Staphylococcus aureus</i> (MRSA) biofilm by cationic poly (D, L-lactide-co-glycolide) nanoparticles
Yang Qiu, Yuqi Wu, Boyao Lu, Guanyin Zhu, Tao Gong, Rui Wang, Qiang Peng, Yuqing Li
Abstract
The emergent need for new treatment methods for multi-drug resistant pathogens such as methicillin-resistant Staphylococcus aureus (MRSA) has focused attention on novel potential tools like nanoparticles (NPs). In the present study, a drug-free cationic nanoparticles (CNPs) system was developed and its anti-MRSA effects were firstly investigated. The results showed that CNPs (261.7 nm, 26.1 mv) showed time- and concentration-dependent activity against MRSA growth, killing ∼ 90% of planktonic bacterial cells in 3 h at 400 μg ml−1, and completely inhibiting biofilm formation at 1000 μg ml−1. Moreover, CNPs at 400 μg ml−1 reduced the minimum inhibitory concentration (MIC) of vancomycin on inhibition of planktonic MRSA growth (∼ 25%) and biofilm formation (∼ 50%). The CNPs–bacteria interaction force was up to 22 nN. Overall, these data suggest that CNPs have a good potential in clinical applications for the prevention and treatment of MRSA infection.