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Published on: June 22, 2016
Immunophenotypical, morphologic, and functional characterization of maturation-associated plasmacytoid dendritic cell
Lourdes Martín-Martín1, Julia Almeida, Pilar María Hernández-Campo
1Instituto de Biología Molecular y Celular del Cáncer, Centro de Investigación del Cáncer/IBMCC (CSIC-USAL), Salamanca, Spain.
Insights
Three distinct maturation stages of plasmacytoid dendritic cell precursors (pre-pDCs) were identified in normal bone marrow. These stages exhibit unique phenotypical, morphological, and functional characteristics, aiding in understanding pDC malignancies.
Area of Science:
- Hematology
- Immunology
- Cell Biology
Background:
- Information on plasmacytoid dendritic cell precursor (pre-pDC) maturation in normal bone marrow (BM) is limited.
- Understanding normal pre-pDC development is crucial for interpreting aberrant processes in malignancies.
Purpose of the Study:
- To systematically characterize the immunophenotypical, morphological, and functional changes during normal pre-pDC maturation in adult human bone marrow.
- To establish a reference framework for identifying and classifying pre-pDC populations.
Main Methods:
- Analysis of adult normal human bone marrow (n=45) using immunophenotyping, morphology, and functional assays.
- Identification and staging of pre-pDCs based on the expression of key surface markers (CD34, HLA-DR, CD123, CD45, CD304, CD85j).
Main Results:
- Three distinct maturation stages (Stage I, II, III) of pre-pDCs were identified, characterized by differential expression of surface markers.
- Stage I pre-pDCs showed high endocytic activity, while Stages II and III exhibited T-cell proliferation induction and interferon-g secretion.
- Morphological and functional changes correlated with the defined maturation stages, indicating progressive differentiation.
Conclusions:
- Three distinct maturation stages of pre-pDCs with unique characteristics exist in normal adult bone marrow.
- These findings provide a critical reference for the study of plasmacytoid dendritic cell malignancies.
- The identified stages offer insights into normal hematopoiesis and immune cell development.
Background:
Information about maturation of plasmacytoid dendritic cell precursors (pre-pDCs) in normal bone marrow (BM) remains limited.
Study Design And Methods:
Immunophenotypical, morphologic, and functional changes associated with maturation of pre-pDCs were analyzed in adult normal human BM (n = 45).
Results:
Three pre-pDC maturation stages, with an increasingly higher degree of maturity, were systematically identified: CD34++/HLA-DR++/+++/CD123++/CD45+/++ (Stage I), CD34+/HLA-DR+/++/CD123++/+++/CD45+/++ (Stage II), and CD34-/HLA-DR++/CD123++/+++/CD45++ (Stage III) cells. Lymphoid- and early myeloid-associated molecules, as well as CD86, were coexpressed in Stage I pre-pDCs, being down regulated afterward. CD304 and CD85j appeared in Stage I, progressively increasing their levels thereafter. Interestingly, cutaneous lymphocyte-associated antigen was heterogeneously expressed throughout the maturation, particularly in Stage I pre-pDCs. The morphologic appearance of Stage I pre-pDCs was consistent with their undifferentiated stage, while Stage II/III cells showed morphologic features of more differentiated cells. From the functional point of view, only Stage II and Stage III pre-pDCs were capable of inducing allogeneic T-cell proliferation, the later subset also showing interferon-g secretion; in contrast, Stage I pre-pDCs showed the highest endocytic ability.
Conclusion:
In summary, three maturation stages of pre-pDCs can be identified in adult normal BM, which show unique phenotypical, morphologic, and functional characteristics; these results provide a frame of reference for a better understanding of pDC malignancies.
