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Differential requirement for the CD40-CD154 costimulatory pathway during Th cell priming by CD8 alpha+ and CD8 alpha-
Takahiro Yasumi1, Kenji Katamura, Takakazu Yoshioka
1Department of Pediatrics, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
Insights
CD40-CD154 interactions are crucial for CD8 alpha(+) dendritic cells (DCs) to drive Th1 immune responses. However, CD8 alpha(-) DCs can induce Th2 responses independently of this interaction, highlighting distinct roles for DC subsets in adaptive immunity.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Dendritic cells (DCs) orchestrate adaptive immunity by priming T helper (Th) cell populations.
- Murine DC subsets, specifically CD8 alpha(+) and CD8 alpha(-), exhibit differential regulation of Th responses.
Purpose of the Study:
- To investigate the role of CD40-CD154 interactions in Th cell priming by CD8 alpha(+) and CD8 alpha(-) DC subsets.
- To elucidate the distinct mechanisms by which these DC subsets induce Th1 and Th2 responses.
Main Methods:
- Adoptive transfer of antigen-pulsed CD8 alpha(+) and CD8 alpha(-) DCs in vivo.
- In vitro stimulation of naive Th cells with DC subsets.
- Interruption of CD40-CD154 and CD80/CD86-CD28 co-stimulatory pathways.
Main Results:
- CD8 alpha(+) DCs induced Th1 responses and IgG2a production, while CD8 alpha(-) DCs induced Th2 responses and IgE production.
- Disruption of CD40-CD154 interactions inhibited Th1 induction by CD8 alpha(+) DCs but not Th2 induction by CD8 alpha(-) DCs.
- CD40-CD154 interactions were essential for IL-12 production by CD8 alpha(+) DCs, promoting Th1 differentiation.
Conclusions:
- CD40-CD154 interactions are critical for CD8 alpha(+) DC-mediated Th1 responses to protein antigens.
- CD8 alpha(-) DCs can induce Th2 responses independently of CD40-CD154 signaling.
- This study reveals distinct functional roles for DC subsets in directing adaptive immunity.
Abstract:
Dendritic cells (DCs) regulate the development of distinct Th populations and thereby provoke appropriate immune responses to various kinds of Ags. In the present work, we investigated the role CD40-CD154 interactions play during the process of Th cell priming by CD8 alpha(+) and CD8 alpha(-) murine DC subsets, which have been reported to differently regulate the Th response. Adoptive transfer of Ag-pulsed CD8 alpha(+) DCs induced a Th1 response and the production of IgG2a Abs, whereas transfer of CD8 alpha(-) DCs induced Th2 cells and IgE Abs in vivo. Induction of distinct Th populations by each DC subset was also confirmed in vitro. Although interruption of CD80/CD86-CD28 interactions inhibited Th cell priming by both DC subsets, disruption of CD40-CD154 interactions only inhibited the induction of the Th1 response by CD8 alpha(+) DCs in vivo. CD40-CD154 interactions were not required for the proliferation of Ag-specific naive Th cells stimulated by either DC subset, but were indispensable in the production of IL-12 from CD8 alpha(+) DCs and their induction of Th1 cells in vitro. Taken together, in our immunization model of Ag-pulsed DC transfer, CD40-CD154 interactions play an important role in the development of CD8 alpha(+) DC-driven Th1 responses but not CD8 alpha(-) DC-driven Th2 responses to protein Ags.
