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Secretion patterns of Th1- and Th2-type cytokines in immune deviation caused by dendritic cells
K Kuribayashi1, M Tsukiyama, T Takenaka
1Department of Laboratory Medicine, Wakayama Medical School, Wakayama City, Japan.
Insights
Subcutaneous injection of antigen-pulsed dendritic cells (DCs) promotes type 2 helper T (Th2) cell responses, leading to delayed-type hypersensitivity (DTH). Intravenous DCs favor type 1 helper T (Th1) cells, increasing antibody production.
Area of Science:
- Immunology
- Cellular immunology
Background:
- Immune deviation involves directing immune responses towards specific pathways.
- Dendritic cells (DCs) play a crucial role in initiating and shaping adaptive immune responses.
- Understanding the differential effects of DC administration routes is key to immune modulation.
Purpose of the Study:
- To investigate the impact of subcutaneous versus intravenous administration of antigen-pulsed DCs on immune responses in mice.
- To analyze the cytokine mRNA expression profiles associated with different immune deviation patterns.
- To correlate cytokine profiles with specific antibody isotype production.
Main Methods:
- Mice were injected subcutaneously or intravenously with antigen-pulsed DCs.
- Delayed-type hypersensitivity (DTH) and humoral immunity were assessed.
- Quantitative analysis of cytokine mRNAs, including interleukin-4 (IL-4) and interleukin-5 (IL-5), was performed.
- Specific antibody isotypes (IgG1, IgG2a, IgG2b, IgG3) were measured.
Main Results:
- Subcutaneous DCs induced strong DTH with elevated IL-4 and IL-5 mRNA, indicative of type 2 helper T (Th2) cell activity, but limited humoral immunity.
- Intravenous DCs resulted in weak DTH but increased specific antibody titers, accompanied by higher levels of Th1 cytokine mRNA.
- Antibody isotype analysis showed a correlation between Th1 responses and increased IgG2a, IgG2b, and IgG3 production, while Th2 responses correlated with IgG1 production.
Conclusions:
- The route of antigen-pulsed DC administration significantly influences the type of immune response generated.
- Subcutaneous DCs promote Th2-biased immune deviation with DTH, while intravenous DCs favor Th1-biased responses and antibody production.
- The cross-regulation between Th1 and Th2 cells in DC-induced immune deviation is complex and route-dependent.
Abstract:
The expression of cytokine mRNAs in mice during immune deviation was examined. A subcutaneous injection of antigen-pulsed dendritic cells (DCs) induced strong delayed-type hypersensitivity (DTH) but not humoral immunity, but an intravenous injection of DCs increased the titer of specific antibodies while inducing weak DTH. There was more interleukin-4 and interleukin-5 mRNA in mice given DCs subcutaneously than in those given DCs intravenously. Therefore, synthesis of cytokines from type 2 helper T (Th2) cells was greater when there was DTH but little or no antibody production. This pattern of cytokine synthesis was in accordance with the pattern of isotypes of the specific antibodies produced. In the mice given DCs intravenously, there was more mRNA of Th1 cytokines, and the production of IgG2a, IgG2b, and IgG3 antibodies increased, but that of IgG1 antibody did not. In immune deviation induced by antigen-pulsed DCs, cross-regulation of Th1 and Th2 cells may be more complicated.