Cellular Microenvironment Triggered Ferroptosis and Photodynamic Therapy for Selective Senescent Cell Clearance.

Area of Science:

• Biomedical engineering
• Nanotechnology
• Cellular biology

Background:

• Cellular microenvironment plays a crucial role in disease diagnosis and therapy.
• Senescent cells exhibit elevated reactive oxygen species (ROS) levels, creating a unique microenvironment.
• Targeting senescent cells is a promising therapeutic strategy.

Purpose of the Study:

• To design novel nanoparticles with dual photodynamic and ferroptotic activity.
• To exploit the elevated ROS microenvironment of senescent cells for targeted therapy.
• To develop a safe and effective method for senescent cell clearance.

Main Methods:

• Synthesis of Fe3+ coordinated nitrogen doped graphene quantum dots (Fe@N-GQDs).
• Investigation of Fe@N-GQDs' photodynamic and ferroptotic activities.
• Evaluation of Fe@N-GQDs' efficacy and safety in senescent cell clearance.
• Utilizing the Fe3+/Fe2+ redox cycle to amplify oxidative stress.

Main Results:

• Fe@N-GQDs demonstrated enhanced photodynamic activity due to Fe3+ modulation of nitrogen doped graphene quantum dots (N-GQDs).
• Accumulated Fe@N-GQDs synergistically amplified oxidative stress and activated ferroptosis in senescent cells.
• Achieved 98% clearance efficiency of senescent cells through combined photodynamic and ferroptosis effects.
• Fe@N-GQDs exhibited minimal impact on healthy cells, improving therapeutic safety.

Conclusions:

• Fe@N-GQDs are effective theranostic agents for senescent cell clearance.
• Leveraging the senescent cell microenvironment enhances therapeutic specificity and safety.
• This strategy offers a promising approach for age-related diseases and cancer therapy.