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Related Experiment Video

Updated: Sep 23, 2025

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CpG incorporated DNA microparticles for elevated immune stimulation for antigen presenting cells.

Heejung Jung1, Dajeong Kim2, Yoon Young Kang1

  • 1Department of Bioscience and Biotechnology, Konkuk University 120 Neungdong-ro, Gwangjin-gu Seoul 05029 Republic of Korea hjmok@konkuk.ac.kr.

RSC Advances
|May 11, 2022
PubMed
Summary

CpG-based DNA microparticles (DNA-MPs) enhance immune responses by improving adjuvant stability and delivery. These novel microparticles effectively stimulate macrophages and promote specific antibody production with minimal toxicity.

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Area of Science:

  • Immunology
  • Biotechnology
  • Materials Science

Background:

  • CpG oligodeoxynucleotides (ODN) are potent immune-stimulating adjuvants.
  • Challenges with current CpG ODN adjuvants include stability, cellular delivery, and phagolysosomal release.
  • Addressing these limitations is crucial for efficient immune response induction.

Purpose of the Study:

  • To develop novel CpG-based DNA microparticles (DNA-MPs) as improved adjuvants.
  • To enhance immune response and selective antibody production.
  • To overcome limitations of conventional CpG ODNs.

Main Methods:

  • Fabrication of CpG-based DNA-MPs using complementary rolling circle amplification (cRCA).
  • Controlled size of DNA-MPs (0.5 and 1 μm) for optimized properties.
  • Evaluation of cellular uptake, cytokine production (TNF-α, IL-6) in macrophages, and antibody production in vivo.

Main Results:

  • cRCA method allowed precise control over DNA-MP size.
  • CpG-based 1 μm DNA-MPs (DNA-MP-1.0) showed superior internalization into macrophages.
  • DNA-MP-1.0 elicited significantly higher cytokine production and OVA-specific antibody levels compared to conventional CpG ODNs.
  • No noticeable in vitro or in vivo toxicity was observed.

Conclusions:

  • CpG-based DNA-MPs fabricated by cRCA represent a novel adjuvant platform.
  • DNA-MP-1.0 effectively activates macrophages and enhances selective antibody production.
  • This new adjuvant shows promise for vaccine development due to its efficacy and safety profile.