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Production and Targeting of Monovalent Quantum Dots
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Published on: October 23, 2014

Surface coating directed cellular delivery of TAT-functionalized quantum dots.

Yifeng Wei1, Nikhil R Jana, Shawn J Tan

  • 1Institute of Bioengineering and Nanotechnology, The Nanos, Singapore 138669.

Bioconjugate Chemistry
|August 18, 2009
PubMed
Summary

Functionalized quantum dots (QDs) with TAT peptide were synthesized using three methods. Particle size, surface charge, and coating method influenced cellular uptake and localization, with smaller QDs showing perinuclear localization and larger ones accumulating in lysosomes.

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Area of Science:

  • Nanotechnology
  • Biomedical Engineering
  • Materials Science

Background:

  • Quantum dots (QDs) offer unique optical properties for biomedical applications.
  • Surface functionalization is crucial for QD stability, solubility, and cellular interactions.
  • The TAT peptide is known to enhance cellular uptake of nanoparticles.

Purpose of the Study:

  • To synthesize and characterize TAT peptide-functionalized ZnS-CdSe quantum dots (QDs) using three distinct methods.
  • To investigate the impact of different QD coating strategies on particle properties, cellular uptake, and subcellular localization.
  • To evaluate the colloidal stability and cytotoxicity of the synthesized TAT-QDs.

Main Methods:

  • Preparation of TAT peptide-functionalized QDs via direct ligand exchange (TAT-QD(lig exch)) and covalent conjugation to silane (TAT-QD(silica)) or polyacrylate (TAT-QD(polyacrylate)) coatings.
  • Characterization of QD size, surface charge, and colloidal stability.
  • Assessment of cellular uptake and subcellular localization using microscopy techniques.
  • Evaluation of cytotoxicity.

Main Results:

  • Synthesized TAT-QDs varied in size (6 nm to 25 nm), surface charge, and colloidal stability depending on the preparation method.
  • Increased particle size correlated with increased surface charge and cellular uptake.
  • Smaller TAT-QDs (TAT-QD(lig exch), TAT-QD(silica)) localized primarily in perinuclear regions.
  • Larger TAT-QD(polyacrylate) particles showed localization in both perinuclear regions and lysosomes.
  • TAT-QD(lig exch) exhibited lower colloidal stability and higher cytotoxicity due to weak ligand binding.

Conclusions:

  • The method of QD functionalization significantly influences particle characteristics and biological interactions.
  • Particle size and surface properties are key determinants of cellular uptake and subcellular targeting.
  • Silane and polyacrylate coatings enhance QD water solubility, stability, and cellular interactions compared to direct ligand exchange.