Polymeric nano-system for macrophage reprogramming and intracellular MRSA eradication

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Infectious Diseases

Background:

• Intracellular Methicillin-Resistant Staphylococcus aureus (MRSA) infections are difficult to treat with conventional antibiotics.
• Existing therapies struggle to effectively target and eliminate MRSA residing within host cells.

Purpose of the Study:

• To develop a novel polymeric nano-system for targeted intracellular drug delivery.
• To reprogram infected macrophages and eradicate intracellular MRSA.
• To overcome challenges in treating refractory and recurrent MRSA infections.

Main Methods:

• Formulation of a ferrocene-decorated polymeric nanovesicle (PFMMA-b-PMPC) co-encapsulating clofazimine (CFZ) and interferon-γ (IFN-γ).
• Utilizing PMPC motifs for specific macrophage internalization and intracellular accumulation.
• Designing a stimulus-responsive system activated by intracellular hydrogen peroxide for drug release and endosomal escape.

Main Results:

• The nano-system demonstrated efficient intracellular drug delivery and macrophage reprogramming (M2 to M1 phenotype).
• Ferrocene-mediated Fenton reaction and CFZ enhanced hydroxyl radical generation for MRSA killing.
• Achieved robust eradication of intracellular MRSA and antibiotic-tolerant persisters.

Conclusions:

• The developed nano-system effectively targets intracellular MRSA through immune modulation and reactive oxygen species generation.
• This approach offers a promising strategy for controlling intracellular MRSA infections.
• Provides a novel therapeutic avenue for refractory and recurrent MRSA infections.