Cell-permeable and biocompatible polymeric nanoparticles for apoptosis imaging

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cell Biology

Background:

• Apoptosis, or programmed cell death, is crucial in development and disease.
• Accurate detection of apoptosis is vital for understanding cellular processes and disease progression.
• Current methods for apoptosis detection can be limited in sensitivity or real-time applicability.

Purpose of the Study:

• To develop a novel, cell-permeable, and biocompatible polymeric nanoparticle probe.
• To enable sensitive and real-time imaging of apoptosis in single cells.
• To utilize near-infrared (NIR) fluorescence for enhanced imaging capabilities.

Main Methods:

• Conjugation of a near-infrared (NIR) fluorescence dye (Cy5.5) to a polymer.
• Linking an effector caspase-specific peptide to the polymer-dye conjugate.
• Formation of polymeric nanoparticles that exhibit autoquenching of fluorescence.
• Testing nanoparticle performance in detecting apoptotic cells.

Main Results:

• Developed cell-permeable and biocompatible polymeric nanoparticles.
• Demonstrated that nanoparticles exhibit an autoquenched state due to fluorochrome proximity.
• Showed that nanoparticles generate a strong NIR fluorescence signal specifically in apoptotic cells.
• Validated the probe for real-time imaging of apoptosis in single cells.

Conclusions:

• The developed smart polymeric nanoparticle is an effective probe for apoptosis detection.
• This novel probe allows for sensitive, real-time, single-cell imaging of apoptosis.
• The technology holds promise for advancing research in cell death and related diseases.