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CD83 expression induced by CpG-DNA stimulation in a macrophage cell line RAW 264.7
Min Chul Park1, Dongbum Kim, Younghee Lee
1Department of Microbiology; Center for Medical Science Research, College of Medicine, Hallym University, Chuncheon 200-702, Korea hjookwon@hallym.ac.kr.
Insights
CpG-DNA significantly increases CD83 expression in macrophages, a key immune response. This finding, mediated by NF-κB signaling, highlights CD83
Area of Science:
- Immunology
- Cell Biology
Background:
- CpG-DNA (cytosine-guanine oligodeoxynucleotides) are known to modulate immune cells like macrophages.
- While cytokine induction by CpG-DNA in macrophages is established, its effect on costimulatory molecules remains unclear.
Purpose of the Study:
- To investigate the impact of CpG-DNA on costimulatory molecule expression in RAW 264.7 macrophage cells.
- To elucidate the signaling pathways involved in CpG-DNA-induced CD83 expression.
Main Methods:
- Treatment of RAW 264.7 cells with CpG-DNA.
- Flow cytometry analysis of surface costimulatory molecules (CD80, CD86, CD83, MHC class II).
- Quantitative real-time PCR for CD83 mRNA expression.
- Inhibition of the NF-κB pathway using specific inhibitors.
- Assessment of phagocytic activity.
Main Results:
- CpG-DNA slightly increased CD80 and significantly increased CD83 surface expression.
- CD86 and MHC class II expression remained unchanged.
- CD83 mRNA levels increased, indicating transcriptional regulation.
- NF-κB pathway inhibition reduced CD83 expression and phagocytic activity.
Conclusions:
- CpG-DNA upregulates CD83 expression in macrophages at the transcriptional level, involving the NF-κB pathway.
- Increased CD83 expression may contribute to the immunostimulatory effects of CpG-DNA in macrophages.
Abstract:
CpG-DNA has various immunomodulatory effects in dendritic cells, B cells, and macrophages. While induction of cytokines by CpG-DNA has been well documented in macrophages, the expression of costimulatory molecules in CpG-DNA treated macrophages has not yet been defined. Therefore, we investigated the effects of CpG-DNA on the expression of costimulatory molecules in RAW 264.7 cells. The surface expression of CD80 was slightly increased and CD83 expression was significantly increased in response to CpG-DNA. However, the expression of CD86 and MHC class II was not changed. As expression of CD83 mRNA was also increased by CpG-DNA, CD83 expression is regulated at a transcriptional level. To understand the contribution of signaling pathways to CD83 induction, we used pathway specific inhibitors. The NF-κB inhibitor significantly reduced surface expression of CD83 as well as phagocytic activity of RAW 264.7 cells. Therefore, CD83 expression may contribute to the immunostimulatory effects of CpG-DNA in macrophage cells.
