Cu-doped MOF-based nanocomposites with acidity-triggerable aggregation for precise photothermal/chemokinetic combined...

Area of Science:

• Biomaterials Science
• Nanotechnology
• Infectious Disease Research

Background:

• Precise targeting of bacterial infections is crucial for effective treatment and minimizing collateral damage to healthy tissues.
• Current treatments often struggle with specificity, leading to off-target effects.
• Developing advanced drug delivery systems is key to improving therapeutic outcomes.

Purpose of the Study:

• To design and synthesize an acidity-triggered aggregation nanomaterial for targeted bacterial infection treatment.
• To enhance the antibacterial efficacy of combination therapy through precise spatial localization.
• To reduce the harm to healthy tissues by improving the specificity of the treatment.

Main Methods:

• Synthesis of bimetallic doped metal-organic frameworks (Cu²⁺/ZIF-8, CZ).
• Modification of CZ with polydopamine (PDA) for photothermal properties and glycol chitosan (GCS) for pH-sensitive charge characteristics, yielding CZPG.
• Evaluation of CZPG's surface potential changes in response to pH variations.
• Assessment of CZPG's aggregation and adherence to negatively charged bacteria in acidic environments.

Main Results:

• CZPG exhibits near-neutral potential under normal physiological conditions, showing low affinity for healthy cells.
• At acidic bacterial infection sites, CZPG's surface potential shifts to positive, promoting aggregation and adherence to negatively charged bacteria.
• This pH-triggered aggregation ensures spatial accuracy for combined chemo- and photothermal therapy (CDT/PTT).

Conclusions:

• The designed CZPG nanomaterial effectively targets acidic bacterial infection sites through pH-responsive aggregation.
• This targeted approach enhances the efficacy of combined antibacterial therapies (CDT/PTT).
• CZPG demonstrates potential for developing safer and more effective antibacterial strategies with reduced side effects.