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Research on regulation and its mechanism of bone marrow mesenchymal stem cells (BMSCs) on dendritic cells (DCs), which is the initiating factor in immune response has applicable clinical value. Although BMSCs have a significant regulatory effect on the maturation of DCs, its molecular mechanism is still unclear. BMSCs and DCs, were co-cultured by different concentration ratios. Flow cytometry was used to detect the expression of DC markers (CD83, CD11c). Quantitative reverse transcription PCR (qRT-PCR) was used to measure the expression of related genes in RNA level. Expression of the target proteins was detected with using Western blot assay. miRNA inhibitor and miRNA mimic were used to suppress and up-regulate the expression of the target gene. In this research, our results demonstrated that BMSCs notably inhibited maturation of DCs in the co-culture system of BMSCs and DCs and confirmed that this inhibition is due to overexpression of miR-23b Furthermore, this research found that miR-23b overexpression inhibited the expression of p50/p65, thus blocked the activation of the NF-κB pathway. In conclusion, BMSCs affected the activation of NF-κB pathway through miR-23b overexpression resulting in inhibition of the maturation and differentiation of DCs.

Bone marrow mesenchymal stem cells inhibit dendritic cells differentiation and maturation by microRNA-23b