Nanoparticle-modified microrobots for in vivo antibiotic delivery to treat acute bacterial pneumonia

Summary

This preclinical study creates algae-driven microrobots to actively distribute antibiotics through infected lungs. Using click chemistry, the researchers attached polymer nanoparticles loaded with antibiotic and coated in neutrophil membrane to natural microalgae. In simulated lung fluid, the hybrid constructs moved faster than 110 micrometres per second. Following intratracheal administration to test animals, they spread uniformly into deep lung tissue, were cleared relatively little by alveolar macrophages, and remained for more than two days. Therapeutic testing used mice with acute pneumonia caused by Pseudomonas aeruginosa. Treatment lowered bacterial burden and substantially reduced mortality, while the abstract reports negligible toxicity. The principal finding is that living propulsion can improve the spatial reach and residence of a biomimetic antibiotic carrier in the lung and translate those delivery properties into better infection outcomes. Neutrophil membrane may further support interaction with the infectious environment, while algae provide movement. This supports active pulmonary drug delivery for severe pneumonia, including intensive-care settings. The abstract does not identify the antibiotic, compare standard dosing, quantify tissue drug levels, address repeated administration or microrobot clearance, or establish safety and practicality in humans.