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Updated: May 23, 2026

Protocols for Assessing Radiofrequency Interactions with Gold Nanoparticles and Biological Systems for Non-invasive Hyperthermia Cancer Therapy
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Tumor necrosis factor interaction with gold nanoparticles.

De-Hao Tsai1, Sherrie Elzey, Frank W Delrio

  • 1National Institute of Standards and Technology, Material Measurement Laboratory, Gaithersburg, MD 20899-8520, USA.

Nanoscale
|April 7, 2012
PubMed
Summary
This summary is machine-generated.

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We studied how tumor necrosis factor-α (TNF) protein attaches to gold nanoparticles (AuNPs) and binds to its antibody. This research reveals challenges in characterizing these complex nanoconjugates and offers insights into TNF-AuNP formation and activity.

Area of Science:

  • Bioconjugation chemistry
  • Nanoparticle science
  • Immunology

Background:

  • Tumor necrosis factor-α (TNF) is a key protein in inflammatory responses.
  • Gold nanoparticles (AuNPs) are widely used in biomedical applications.
  • Understanding protein-ligand interactions at the nanoscale is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the molecular conjugation of TNF onto AuNPs.
  • To characterize the binding behavior of anti-TNF antibodies to TNF-conjugated AuNPs.
  • To explore the influence of surface modifications on binding affinity and specificity.

Main Methods:

  • Electrospray-differential mobility analysis
  • Dynamic light scattering
  • Polyacrylamide gel electrophoresis

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  • Spectroscopic techniques (FTIR, fluorescence)
  • Enzyme-linked immunosorbent assay (ELISA)

    • Main Results:

    • Determined the surface density and binding constant of TNF on AuNPs.
    • Observed weak intermolecular binding within TNF trimers on AuNPs, susceptible to dodecyl sulfate ions.
    • Demonstrated significant non-specific binding of anti-TNF to AuNPs.
    • Quantified higher binding affinity of anti-TNF to TNF-conjugated AuNPs compared to non-specific binding.
    • Showed that thiolated polyethylene glycol (SH-PEG) inhibits anti-TNF binding in a dose-dependent manner.

    Conclusions:

    • Characterizing complex nanoconjugates like TNF-AuNPs presents significant challenges.
    • The binding affinity of anti-TNF to TNF-AuNPs is influenced by surface density and the presence of PEG.
    • Insights gained can inform the design of targeted nanomedicines and diagnostic tools.