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Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets
Published on: April 16, 2015
Differential effect of IL-10 on dendritic cell-induced T cell proliferation and IFN-gamma production
S E Macatonia1, T M Doherty, S C Knight
1DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94303.
Insights
Interleukin-10 (IL-10) does not affect dendritic cell-stimulated T-cell proliferation but inhibits interferon-gamma (IFN-γ) production. This suggests IL-10 plays a role in regulating cell-mediated immunity initiation.
Area of Science:
- Immunology
- Cellular Biology
Background:
- Interleukin-10 (IL-10) is known to inhibit T-helper 1 (Th1) cell cytokine production by impairing macrophage accessory function.
- Dendritic cells (DCs) are potent antigen-presenting cells (APCs) crucial for initiating primary T-cell responses.
Purpose of the Study:
- To investigate the effect of IL-10 on DC-induced T-cell proliferation and IFN-γ production in primary immune responses.
- To compare IL-10's inhibitory effects on DC- versus macrophage-stimulated T-cell responses.
Main Methods:
- Primary allogeneic mixed leukocyte responses were established using DCs to stimulate CD4+ and CD8+ T cells.
- The impact of IL-10 on T-cell proliferation and IFN-γ secretion was assessed in these systems.
- Comparative analysis of IL-10's effect on DC- and macrophage-stimulated proliferation was performed.
Main Results:
- IL-10 did not inhibit Th1 proliferation induced by DCs, unlike its effect on macrophage-stimulated proliferation.
- IL-10 significantly down-regulated IFN-γ production by both CD4+ and CD8+ T cells stimulated by DCs.
- DCs effectively stimulated proliferation and IFN-γ secretion in CD4+ and CD8+ T cells during primary responses.
Conclusions:
- IL-10 selectively inhibits DC-driven IFN-γ production, not proliferation, in primary T-cell responses.
- This selective inhibition by IL-10 suggests a regulatory role in controlling the initiation of cell-mediated immunity.
- Findings highlight differential effects of IL-10 on APC-mediated T-cell activation pathways.
Abstract:
IL-10 has previously been shown to inhibit cytokine production by Th1 cells by blocking macrophage accessory cell function. In this study we demonstrate that dendritic cell-induced Th1 proliferation was unaffected by IL-10, whereas macrophage-stimulated proliferation was inhibited in the same system. In contrast dendritic cell induced IFN-gamma production by the Th1 clones was down-regulated by IL-10. Inasmuch as dendritic cells have been shown to be potent APC for T cells in primary responses we determined the effect of IL-10 on dendritic cell-induced proliferation and IFN-gamma production by CD4+ and CD8+ T cells. Dendritic cells were effective at stimulating both proliferation and IFN-gamma secretion of CD4+ or CD8+ T cells in a primary allogeneic mixed leukocyte response. In contrast, IL-10 markedly inhibited dendritic cell driven IFN-gamma production by purified CD4+ and CD8+ T cells. Down-regulation of dendritic cell-induced IFN-gamma production suggests a role for IL-10 in inhibiting the initiation of cell-mediated immune responses.
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