Ultra-small polydopamine nanomedicine-enabled antioxidation against senescence

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Gerontology

Background:

• Cellular senescence, a state of irreversible growth arrest, is linked to aging and age-related diseases.
• Oxidative stress, caused by reactive oxygen and nitrogen species (RONS), is a key driver of senescence.
• Current strategies for managing senescence often lack efficacy or have side effects.

Purpose of the Study:

• To develop and evaluate ultra-small polydopamine nanoparticles (UPDA NPs) with enhanced RONS-scavenging capabilities.
• To investigate the potential of UPDA NPs in preventing and alleviating senescence.
• To explore the therapeutic effects of UPDA NPs on age-related decline in vivo.

Main Methods:

• Engineered ultra-small polydopamine nanoparticles (UPDA NPs) with superoxide dismutase (SOD) and catalase (CAT) enzyme-mimic activities.
• Assessed broad-spectrum RONS-scavenging capacity and cytoprotective effects of UPDA NPs.
• Evaluated the efficacy of UPDA NPs in restoring senescence-related phenotypes in mice and Drosophila models.

Main Results:

• UPDA NPs demonstrated potent RONS-scavenging and cytoprotective effects.
• UPDA NPs treatment restored renal function, tissue homeostasis, fur density, and motor ability in mice.
• UPDA NPs enhanced antioxidant capacity, improved climbing ability, and prolonged lifespan in Drosophila.

Conclusions:

• UPDA NPs effectively delay aging by reducing oxidative stress and mitigating senescence.
• These nanoparticles show promise as a therapeutic strategy for senescence and related diseases.
• The ultra-small size ensures excellent biocompatibility and rapid clearance, minimizing potential toxicity.