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Cell-mediated Immune Responses01:40

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Stimulation of Cytoplasmic DNA Sensing Pathways In Vitro and In Vivo
11:44

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Published on: September 18, 2014

Cellular immunostimulation by CpG-sequence-coated DNA origami structures.

Verena J Schüller1, Simon Heidegger, Nadja Sandholzer

  • 1Center for Nanoscience and Department of Physics, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany.

ACS Nano
|November 19, 2011
PubMed
Summary

DNA origami tubes functionalized with CpG sequences act as potent, non-toxic immunostimulants. These DNA constructs effectively activate immune cells via Toll-like receptor 9 (TLR9) stimulation, outperforming traditional carriers.

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Area of Science:

  • Nanotechnology
  • Immunology
  • Biotechnology

Background:

  • Cytosine-phosphate-guanine (CpG) sequences are recognized by Toll-like receptor 9 (TLR9) to initiate innate immune responses.
  • DNA origami offers a programmable platform for nanomaterial design.
  • Developing non-toxic and efficient immunostimulatory agents is crucial for therapeutic applications.

Purpose of the Study:

  • To evaluate DNA origami tubes as novel immunostimulants.
  • To investigate the immune response triggered by CpG-functionalized DNA origami.
  • To assess the safety and efficacy of DNA origami as a CpG delivery system.

Main Methods:

  • Fabrication of hollow 30-helix DNA origami tubes decorated with CpG oligonucleotides.
  • Incubation of DNA origami constructs with primary spleen cells.
  • Measurement of cytokine production (IL-6, IL-12p70) and immune cell activation.
  • Assessment of cellular toxicity using splenocyte viability assays.
  • Fluorescent microscopy for cellular localization studies.

Main Results:

  • CpG-decorated DNA origami tubes induced significant cytokine production and immune cell activation.
  • The immunostimulatory effect was dependent on Toll-like receptor 9 (TLR9) activation.
  • DNA origami constructs showed superior immunostimulation compared to CpG oligonucleotides with Lipofectamine.
  • No detectable toxicity was observed for the DNA origami constructs.
  • CpG-containing DNA origami localized to the endosomes within cells.

Conclusions:

  • DNA origami constructs serve as an efficient and non-toxic delivery system for CpG oligonucleotides.
  • Programmable DNA origami can be utilized as a potent immunostimulant.
  • This technology holds promise for developing novel immunotherapies.