Related Experiment Video
Updated: Aug 11, 2025
13:06
Solubilization and Bio-conjugation of Quantum Dots and Bacterial Toxicity Assays by Growth Curve and Plate Count
Published on: July 11, 2012
14.4K
Cellular Localization, Aggregation, and Cytotoxicity of Bicelle-Quantum Dot Nanocomposites
Justin M Fang1, Sayan Basu1, Jak Phu2
1Department of Biomedical Engineering, University of Connecticut, Storrs, Connecticut06269, United States.
ACS Applied Bio Materials
|February 5, 2023
Summary
Bicelle-encapsulated quantum dots (QDs) show rapid cellular uptake and distinct intracellular localization changes over time in Hek293t cells. While bicelles reduce QD cytotoxicity, they do not eliminate it, impacting potential cellular imaging applications.
Area of Science:
- Nanotechnology
- Cell Biology
- Materials Science
Background:
- Bicelles are discoidal lipid nanoparticles (LNPs) with a hydrophobic core suitable for encapsulating hydrophobic molecules and large complexes like quantum dots (QDs).
- CdSe/ZnS QDs are known for their imaging potential but also exhibit cytotoxicity.
- Understanding the cellular fate of encapsulated QDs is crucial for developing safe and effective nanomedicines.
Purpose of the Study:
- To investigate the cellular localization and time-dependent behavior of bicelle-encapsulated quantum dots (bicelle-QDs) in Hek293t cells.
- To assess the morphological evolution and cytotoxicity of bicelle-QDs within cells.
- To provide insights into the potential of bicelle-QD nanocomplexes for cellular imaging.
Main Methods:
- Synthesis of bicelle-QD nanocomplexes using CdSe/ZnS QDs encapsulated in bicelles composed of specific lipids and polyethylene glycol.
- Incubation of bicelle-QDs with Hek293t cells and HeLa cells for varying time points (15 min to 4 h).
- Microscopy and cellular analysis to determine localization, aggregation, and cytotoxicity.
Main Results:
- Bicelle-QDs rapidly penetrated Hek293t cell membranes within 15 minutes, localizing to the cytoplasm and associating with mitochondria and vesicles.
- Nuclear entry of bicelle-QDs was observed after 1 hour, followed by widespread aggregation and near-complete nuclear absence by 4 hours.
- Encapsulation of QDs in bicelles attenuated cytotoxicity, but did not completely eliminate it.
Conclusions:
- Bicelle-encapsulated QDs exhibit dynamic intracellular trafficking and morphological changes over time in Hek293t cells.
- The study elucidates the time-resolved pathway and cellular fate of bicelle-QDs, highlighting their potential and limitations for cellular imaging.
- Further research is needed to optimize bicelle-QD formulations for enhanced safety and efficacy in biomedical applications.
