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Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...

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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Bionanoprobes to study particle-cell interactions.

Christian Fillafer1, Daniela S Friedl, Adina K Ilyes

  • 1Department of Pharmaceutical Technology and Biopharmaceutics, Faculty of Life Sciences, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria.

Journal of Nanoscience and Nanotechnology
|May 21, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed stable, functionalized nanoparticles (NPs) for drug delivery. HSA-conjugated NPs showed enhanced cell adhesion, offering potential for targeted therapies.

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Area of Science:

  • Nanotechnology
  • Biomedical Engineering
  • Materials Science

Background:

  • Nanoparticle-biological system interactions depend on size and composition.
  • Surface functionalization allows fine-tuning of nanoparticle interactions.
  • Developing model systems is crucial for studying nanoparticle behavior.

Purpose of the Study:

  • To create a model system for studying nanoparticle-cell interactions.
  • To encapsulate a hydrophobic fluorophore (BODIPY 493/503) into poly(D,L-lactide-co-glycolide) (PLGA) nanodroplets.
  • To evaluate the stability and characteristics of plain and human serum albumin (HSA)-conjugated nanoparticles.

Main Methods:

  • Encapsulation of BODIPY 493/503 into PLGA nanodroplets.
  • Particle size and zeta potential analysis.
  • Stability testing under various storage and incubation conditions.
  • Flow cytometry and fluorescence microscopy for cell interaction studies.

Main Results:

  • Plain and HSA-conjugated nanoparticles remained stable without agglomeration for 28 days at 4°C and -80°C.
  • Nanoparticle stability was unaffected by buffers and cell culture media, but protein dispersants caused quenching.
  • No marker release occurred at 4°C over 7 days; release began after 3 hours at 37°C.
  • HSA-conjugated nanoparticles exhibited enhanced adhesion to Caco-2 cells.

Conclusions:

  • PLGA nanodroplets encapsulating BODIPY 493/503 provide a stable, analytically accessible model system.
  • Surface functionalization with HSA enhances nanoparticle adhesion to cells.
  • These findings support the potential of functionalized nanoparticles for targeted therapeutic applications.