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Area of Science:

  • Biophysics
  • Immunology
  • Materials Science

Background:

  • Cell-free DNA (cfDNA) interactions with particles are implicated in autoimmune diseases like systemic lupus erythematosus.
  • Previous work demonstrated that DNA adsorbed onto synthetic particles enhances macrophage immunostimulatory responses, establishing a model for studying DNA-particle interactions in autoimmunity.

Purpose of the Study:

  • To investigate the biophysical interactions between DNA of varying lengths and synthetic particles of different sizes.
  • To determine how particle-associated DNA is protected from nuclease degradation, specifically DNase 1.
  • To elucidate the role of particle size and DNA corona formation in DNA protection and particle aggregation.

Main Methods:

  • Characterization of DNA-particle complexes using PicoGreen DNA assay, NanoDrop spectroscopy, dynamic light scattering (DLS), confocal fluorescence microscopy, and transmission electron microscopy.
  • Assessment of DNA resistance to DNase 1 degradation in the presence of varying particle sizes and DNA types (double-stranded vs. single-stranded).

Main Results:

  • Particle size significantly impacts the protection of adsorbed DNA from nuclease degradation; smaller particles (40, 200 nm) offered less protection compared to larger ones.
  • Increased particle aggregation was observed with smaller particles, correlating with reduced DNA protection.
  • A single-stranded DNA corona on smaller (200 nm) particles conferred significant protection against nuclease degradation, contrasting with double-stranded DNA on similar-sized particles.

Conclusions:

  • The formation of a DNA corona on larger particles provides a protective effect against nuclease degradation.
  • Particle aggregation, prevalent with smaller particles, does not confer protection.
  • These findings offer a biophysical framework for understanding cfDNA-particle interactions in the context of autoimmune diseases and guide future research.