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Related Experiment Videos

Ribavirin or CpG DNA sequence-modulated dendritic cells decrease the IgE level and airway inflammation.

Dian-Jung Chiang1, Yi-Ling Ye, Wei-Li Chen

  • 1Department of Medical Research, National Taiwan University Hospital, Number 1 Chang-Teh Street, Taipei, Taiwan 100, Republic of China.

American Journal of Respiratory and Critical Care Medicine
|August 28, 2003
PubMed
Summary

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Dendritic cell (DC) immunotherapy modulated by ribavirin and CpG-oligodeoxynucleotides (ODN) shows potential for treating asthma. This approach helps rebalance immune responses and reduce airway inflammation in an asthma model.

Area of Science:

  • Immunology
  • Allergy Research
  • Cellular Therapy

Background:

  • Asthma is an allergic condition marked by Th1/Th2 cell imbalance and a dominant Th2 immune response.
  • Dendritic cells (DCs) play a crucial role in immune regulation and are being explored for immunotherapy.
  • Modulating DC function is a potential strategy to correct immune dysregulation in allergic diseases.

Purpose of the Study:

  • To investigate the efficacy of dendritic cell (DC)-based immunotherapy in modulating immune responses in an allergic asthma model.
  • To evaluate the effects of ribavirin and CpG-oligodeoxynucleotides (ODN) on DCs and their subsequent impact on asthma pathology.
  • To determine if in vitro modulated DCs can serve as a therapeutic approach for asthma.

Main Methods:

  • BALB/c mice were injected with DCs incubated with ovalbumin (OVA) alone, OVA plus ribavirin, OVA plus CpG-ODN (ODN 1826), or OVA plus non-CpG-ODN (ODN 1745).

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  • An asthma model was established by intraperitoneal immunization with OVA.
  • Analyses included serum OVA antibody levels, airway hyperresponsiveness, bronchoalveolar lavage fluid cytology and cytokine profiles, and spleen cell cytokine profiles.

    • Main Results:

    • Ribavirin and ODN 1826 treatments increased interleukin-12 (IL-12) synthesis and decreased interleukin-10 (IL-10) production.
    • ODN 1826 enhanced the expression of co-stimulatory molecules (B7.1, B7.2) and MHC molecules on DCs.
    • DCs modulated with ribavirin or ODN 1826 effectively downregulated the Th2 immune response and alleviated airway inflammation in vivo.

    Conclusions:

    • Ribavirin and CpG-ODN modulate DC function, shifting the immune balance away from a Th2-dominant response.
    • In vitro modulated DCs demonstrate potential as a therapeutic strategy for allergic asthma.
    • This study provides insights into the mechanisms by which DC-based immunotherapy can combat allergic airway inflammation.