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Dendritic cells (DCs) are professional antigen-presenting cells that sample their environment and present antigens to naïve T lymphocytes for the subsequent antigen-specific immune responses. DCs exist in a range of distinct subpopulations including plasmacytoid DCs (pDCs) and classical DCs (cDCs), with the latter consisting of the cDC1 and cDC2 lineages. Although the roles of DC-specific transcription factors across the DC subsets have become understood, the posttranscriptional mechanisms that regulate DC development are yet to be elucidated. MicroRNAs (miRNAs) are pivotal posttranscriptional regulators of gene expression in a myriad of biological processes, but their contribution to the immune system is just beginning to surface. In this study, our in-house probe collection was screened to identify miRNAs possibly involved in DC development and function by targeting the transcripts of relevant mouse transcription factors. Examination of DC subsets from the culture of mouse bone marrow with Flt3 ligand identified high expression of miR-124 which was able to target the transcript of TCF4, a transcription factor critical for the development and homeostasis of pDCs. Further expression profiling of mouse DC subsets isolated from in vitro culture as well as via ex vivo purification demonstrated that miR-124 was outstandingly expressed in CD24(+) cDC1 cells compared to in pDCs and CD172α(+) cDC2 cells. These results imply that miR-124 is likely involved in the processes of DC subset development by posttranscriptional regulation of a transcription factor(s).
Dendritic cells (DCs) are routinely produced from the culture of mouse bone marrow (BM) with granulocyte-macrophage colony-stimulating factor (GM-CSF) within a period of 10days. Although splenic extramedullary myelopoiesis was suggested to occur under the influence of GM-CSF, the hematopoietic outcome of splenic culture with GM-CSF has not been scrutinized. We have cultured mouse splenocytes with GM-CSF for an extended period of time, where we discovered that the CD11b⁺CD11c⁺ cells began to proliferate prominently after 10days and their number increased until the 4th week of the culture. In parallel experiments, FMS-like tyrosine kinase 3 (FLT3) and its ligand, FLT3L, were not found to influence the culture of splenocytes. Like DCs in the culture of BM with GM-CSF, a distinct population of CD11b⁺CD11c⁺MHC IIhi cells was readily identified as DCs in the long-term culture of splenocytes. After being isolated and plated overnight the CD11b⁺CD11c⁺MHC IIhi cells exhibited non-adherent dendritic morphology, while the other CD11b⁺CD11c⁺ cells became adherent. Besides, these CD11b⁺CD11c⁺MHC IIhi cells possessed relatively weak endocytic and phagocytic abilities but displayed strong antigen-presenting capacities, revealing DC-like characteristics; in contrast, the other CD11b⁺CD11c⁺ cells showed strong endocytosis and phagocytosis of antigens but were poor at antigen presentation, indicating macrophage-like traits. Therefore, we demonstrated that phenotypically as well as functionally genuine DCs are generated in the long-term culture of splenocytes with GM-CSF.
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