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IFN-α regulates Blimp-1 expression via miR-23a and miR-125b in both monocytes-derived DC and pDC
Stefania Parlato1, Roberto Bruni, Paola Fragapane
1Department of Hematology, Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy.
Insights
Type I interferons (IFN-I) regulate dendritic cell (DC) differentiation and function. This study reveals Blimp-1 as a key regulator in IFN-α-driven DC differentiation, potentially explaining shared features between monocyte-derived and plasmacytoid DCs.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Type I interferons (IFN-I) are critical for immune cell signaling, influencing dendritic cell (DC) differentiation and function.
- IFN-I, particularly IFN-α, shapes the phenotype and function of human monocyte-derived DCs (mo-DCs) and plasmacytoid DCs (pDCs).
Purpose of the Study:
- To investigate the molecular mechanisms by which IFN-α drives human monocyte-derived DC differentiation.
- To compare IFN-α-induced changes in mo-DCs with those in IFN-α-treated pDCs.
- To identify key regulators involved in IFN-α-mediated DC differentiation.
Main Methods:
- Analysis of miRNA signatures in IFN-α-treated human mo-DCs.
- Investigated the association between specific miRNAs (miR-23a, miR-125b) and Blimp-1 expression.
- Compared phenotypic, molecular, and functional characteristics of IFN-α mo-DCs and IFN-α-treated pDCs.
Main Results:
- A distinct miRNA signature was identified in IFN-α mo-DCs.
- miR-23a and miR-125b negatively correlated with Blimp-1 upregulation during IFN-α-driven DC differentiation.
- IFN-α mo-DCs and IFN-α-treated pDCs exhibited shared miRNA patterns regulating Blimp-1 and similar cellular hallmarks.
Conclusions:
- Blimp-1 plays a novel role in human DC differentiation induced by IFN-α.
- Blimp-1 is identified as a key IFN-α-mediated regulator potentially responsible for shared functional characteristics between IFN-α mo-DCs and pDCs.
Abstract:
Type I interferon (IFN-I) have emerged as crucial mediators of cellular signals controlling DC differentiation and function. Human DC differentiated from monocytes in the presence of IFN-α (IFN-α DC) show a partially mature phenotype and a special capability of stimulating CD4+ T cell and cross-priming CD8+ T cells. Likewise, plasmacytoid DC (pDC) are blood DC highly specialized in the production of IFN-α in response to viruses and other danger signals, whose functional features may be shaped by IFN-I. Here, we investigated the molecular mechanisms stimulated by IFN-α in driving human monocyte-derived DC differentiation and performed parallel studies on peripheral unstimulated and IFN-α-treated pDC. A specific miRNA signature was induced in IFN-α DC and selected miRNAs, among which miR-23a and miR-125b, proved to be negatively associated with up-modulation of Blimp-1 occurring during IFN-α-driven DC differentiation. Of note, monocyte-derived IFN-α DC and in vitro IFN-α-treated pDC shared a restricted pattern of miRNAs regulating Blimp-1 expression as well as some similar phenotypic, molecular and functional hallmarks, supporting the existence of a potential relationship between these DC populations. On the whole, these data uncover a new role of Blimp-1 in human DC differentiation driven by IFN-α and identify Blimp-1 as an IFN-α-mediated key regulator potentially accounting for shared functional features between IFN-α DC and pDC.
