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Biofilm-associated bacterial infection brings serious threats to global public health owing to serious antibiotic resistance. It is urgently needed to develop innovative strategies to combat biofilm-associated bacterial infections. Polymyxins stand out as the last line of defense against Gram-negative bacteria. However, serious nephrotoxicity of polymyxins severely limits their clinical utility. Herein, a hypoxia-responsive liposome is designed as the nanocarrier of polymyxin B (PMB) to combat biofilms developed by Gram-negative bacteria. A metronidazole modified lipid (hypoxia-responsive lipid (HRLipid)) is synthesized to fabricate hypoxia-responsive liposomes (HRLip). PMB loaded hypoxia-responsive liposomes (HRL-PMB) is then prepared to mitigate the nephrotoxicity of PMB while preserving its excellent bactericidal activity. HRL-PMB shows very low hemolysis and cytotoxicity due to liposomal encapsulation of PMB. PMB can be readily released from HRL-PMB in response to hypoxic biofilm microenvironment, exerting its bactericidal activity to realize biofilm eradication. The excellent in vivo antibiofilm ability of HRL-PMB is confirmed by a Pseudomonas aeruginosa infected zebrafish model and a P. aeruginosa pneumonia infection model. Meanwhile, HRL-PMB can greatly reduce the nephrotoxicity of PMB after intravenous injection. The hypoxia-sensitive liposomes held great promise to improve the biosafety of highly toxic antibiotics while preserving their intrinsic bactericidal ability, which may provide an innovative strategy for combating biofilm-associated infections.
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