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Development of Stem Cell-derived Antigen-specific Regulatory T Cells Against Autoimmunity
10:10

Development of Stem Cell-derived Antigen-specific Regulatory T Cells Against Autoimmunity

Published on: November 8, 2016

CD8alpha+ dendritic cells enhance the antigen-specific CD4+ T-cell response and accelerate development of

Young Ok Jung1, So-Youn Min, Mi-La Cho

  • 1Division of Rheumatology, Department of Internal Medicine, Kang-Nam Sacred Heart Hospital, Hallym University, Seoul, Republic of Korea.

Immunology Letters
|July 6, 2007
PubMed

Insights

CD8alpha(+) dendritic cells (DCs) accelerate collagen-induced arthritis (CIA) by stimulating immune responses and increasing inflammatory cytokines. Conversely, CD8alpha(-) DCs partially inhibit CIA development, highlighting distinct roles in autoimmune disease.

Area of Science:

  • Immunology
  • Autoimmunity
  • Dendritic Cell Biology

Background:

  • Collagen-induced arthritis (CIA) is a T cell-mediated autoimmune disease.
  • Dendritic cells (DCs) play a crucial role in initiating immune responses.
  • The specific roles of CD8alpha(+) and CD8alpha(-) DC subsets in CIA pathogenesis are not fully understood.

Purpose of the Study:

  • To investigate the distinct roles of CD8alpha(+) and CD8alpha(-) dendritic cell subsets in the development of collagen-induced arthritis (CIA).
  • To elucidate the immunogenic properties and functional impact of these DC subsets on T cell responses and cytokine production in CIA.

Main Methods:

  • Mixed-lymphocyte reactions and cytokine enzyme-linked immunoassay were used to assess DC immunogenicity.
  • Adoptive transfer of collagen type II (CII)-pulsed CD8alpha(+) or CD8alpha(-) DCs with CD4(+) T cells into DBA mice.
  • Monitoring of arthritis onset and severity over 14 weeks post-transfer.

Main Results:

  • CD8alpha(+) DCs exhibited higher expression of MHC-II and CD80 compared to CD8alpha(-) DCs.
  • CII-pulsed CD8alpha(+) DCs significantly enhanced CD4(+) T cell proliferation and increased production of IL-12p70, IL-17, IFN-gamma, and TNF-alpha.
  • Adoptive transfer of CD8alpha(+) DCs accelerated CIA onset, while CD8alpha(-) DCs showed a partial inhibitory effect.

Conclusions:

  • CD8alpha(+) DCs accelerate CIA development by enhancing CII-reactive CD4(+) T cell responses and promoting inflammatory cytokine production.
  • CD8alpha(-) DCs may possess regulatory functions that partially inhibit CIA pathogenesis.
  • These findings highlight the differential roles of DC subsets in orchestrating autoimmune responses in CIA.

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