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[Activation of NOD2 signalling pathway stimulates the function of human dendritic cells loaded with leukemia cell
Dan-Lei Han1, Hai-Yan Wang1, Jing-Ming Guo1
1Department of Hematology, The First Clinical Medical College of Three Gorges University, Yichang 443000, Hubei Province, China.
Insights
Muramyl dipeptide (MDP) enhances NOD2 signaling in dendritic cells (DC) loaded with leukemia cell lysates. This boosts DC maturation and IL-12p40 secretion, offering potential for leukemia immunotherapy.
Area of Science:
- Immunology
- Cell Biology
- Cancer Research
Background:
- Dendritic cells (DC) are crucial for initiating immune responses.
- NOD2 signaling pathway plays a role in immune cell activation.
- Leukemia immunotherapy aims to harness the immune system to fight cancer.
Purpose of the Study:
- To investigate the effect of muramyl dipeptide (MDP) on NOD2 signaling in human monocyte-derived dendritic cells (DC).
- To assess the immunomodulatory impact of MDP-activated, leukemia cell lysate-loaded DC.
- To explore the potential of this approach for leukemia immunotherapy.
Main Methods:
- Isolation and maturation of peripheral blood mononuclear cells into dendritic cells (DC).
- Loading of DC with HL-60 leukemia cell lysates.
- Stimulation of DC with muramyl dipeptide (MDP) to activate the NOD2 pathway.
- Analysis of NOD2 expression (mRNA and protein) via RT-PCR and Western blot.
- Phenotypic analysis of DC surface molecules (HLA-DR, CD80, CD83, CD86, CD40) using flow cytometry.
- Quantification of IL-12 (p40) secretion using ELISA.
Main Results:
- MDP significantly upregulated NOD2 mRNA and protein expression in DC, particularly in sensitized DC stimulated with MDP.
- MDP stimulation led to the highest expression of DC surface molecules (HLA-DR, CD80, CD83, CD86, CD40) in the sensitized DC+MDP group.
- MDP treatment markedly increased IL-12p40 secretion, with the highest levels observed in the sensitized DC+MDP group.
Conclusions:
- MDP significantly enhances NOD2 expression and promotes the maturation of dendritic cells loaded with leukemia cell lysates.
- MDP boosts the expression of key surface molecules and increases the secretion of IL-12p40, indicating enhanced immunomodulatory capacity.
- This study provides a novel strategy for utilizing dendritic cells in leukemia immunotherapy.
Abstract:
The purpose of this study was to explore the effect of NOD2 signalling pathway activated by muramyl dipeptide (MDP) on the immunomodulation effect of human monocyte-derived dendritic cells (DC) loaded with leukemia cell lysates. Peripheral blood mononuclear cells (PBMNC) were isolated by density gradient centrifugation, These cells were cultured with three cytokines for 7 days to induce their maturation. On the 5th day, cells were loaded with leukemia cell HL-60 lysates. NOD2 expression was detected by RT-PCR and Western blot. The phenotype of DC were analyzed by flow cytometry, and ELISA was used to assay levels of IL-12 (p40) . The results showed that MDP could trigger NOD2 mRNA and protein expression in different groups of DC, especially in sensitized DC+MDP group, which was significantly higher than that in the DC+MDP group and sensitized DC without MDP stimulation, the difference was statistically significant (P < 0.05). Besides, the expression of surface molecules (HLA-DR, CD80, CD83, CD86, CD40) in the group of DC loaded with leukemia cell lysate and stimulated by MDP (sensitized DC+MDP) reached the highest level, followed by the group of DC loaded with leukemia cell lysate without MDP and DC only stimulated by MDP, non-treated DC were the lowest (P < 0.05). Similarly, compared with untreated unstimulated DC, after loading with HL-60 lysates or only stimulating with MDP, the secretion of IL-12p40 increased, but IL-12p40 level (573.86 ± 32.09 pg/ml) in DC+MDP group was higher than that in group of sensitized DC (365.03 ± 28.86 pg/ml) (P < 0.05), and it in sensitized DC+MDP group reached the highest (898.30 ± 61.08) pg/ml, compared to other groups (P < 0.05). It is concluded that MDP can significantly enhance the NOD2 mRNA and protein expression in sensitized DC, promote the expression of HLA-DR, synergistic costimulatory molecules and adhesion molecules of DC, at the same time, MDP can increase secretion of inflammatory factors IL-12p40. This study will provide a new ideas for DC application in leukemia immunotherapy.
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