Next-Generation Theranostic Agents Based on Polyelectrolyte Microcapsules Encoded with Semiconductor Nanocrystals:...

Area of Science:

• Nanotechnology and Materials Science
• Biomedical Engineering
• Cell Biology

Background:

• Polyelectrolyte microcapsules offer potential as carriers for theranostic agents.
• Semiconductor quantum dots (QDs) provide bright, photostable fluorescence for bio-imaging.
• Integrating QDs into microcapsules can enhance visualization of cellular processes.

Purpose of the Study:

• To design, fabricate, and characterize polyelectrolyte microcapsules encoded with quantum dots.
• To evaluate the physico-chemical and functional properties of these QD-encoded microcapsules.
• To demonstrate their utility for live cell imaging and tracking intracellular delivery.

Main Methods:

• Fabrication of polyelectrolyte microcapsules encoded with water-solubilized core/shell QDs.
• Characterization using dynamic light scattering, electrophoretic mobility, and scanning electron microscopy.
• Optical characterization via fluorescence and confocal microscopy, including fluorescence lifetime measurements.

Main Results:

• Successfully developed QD-encoded polyelectrolyte microcapsules with defined size, surface charge, and morphology.
• Determined optimal QD content for superior fluorescence properties and evaluated fluorescence lifetime stability.
• Demonstrated efficient intracellular uptake of microcapsules by murine macrophages.

Conclusions:

• The developed QD-encoded microcapsules are suitable theranostic agents with excellent imaging capabilities.
• This system allows for effective visualization of microcapsule transport and delivery within living cells.
• The findings confirm the potential for live cell imaging and tracking applications.