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Directed Differentiation of Primitive and Definitive Hematopoietic Progenitors from Human Pluripotent Stem Cells
14:37

Directed Differentiation of Primitive and Definitive Hematopoietic Progenitors from Human Pluripotent Stem Cells

Published on: November 1, 2017

CD34+ hematopoietic progenitors from human cord blood differentiate along two independent dendritic cell pathways in

C Caux1, B Vanbervliet, C Massacrier

  • 1Laboratory for Immunological Research, Dardilly, France.

The Journal of Experimental Medicine
|August 1, 1996
PubMed

Insights

Human hematopoietic stem cells differentiate into two distinct dendritic cell (DC) types: Langerhans cells and dermal/circulating DCs. CD14+ precursors can also form macrophages, highlighting diverse DC development pathways.

Area of Science:

  • Immunology
  • Cell Biology
  • Hematopoiesis

Background:

  • Human dendritic cells (DCs) are crucial for immune responses.
  • Large-scale in vitro generation of DCs from CD34+ hematopoietic progenitors is possible using GM-CSF and TNF-alpha.
  • Understanding DC differentiation pathways is key to their application in immunotherapy.

Purpose of the Study:

  • To investigate the distinct differentiation pathways of human cord blood CD34+ hematopoietic progenitors into dendritic cells.
  • To characterize the phenotypes and functions of emerging DC subsets.
  • To explore the bipotent potential of DC precursors.

Main Methods:

  • Culture of CD34+ hematopoietic progenitors with GM-CSF and TNF-alpha for 12 days.
  • Analysis of cell surface markers (CD1a, CD14, CD80, CD83, CD86, CD58, HLA class II) at different time points.
  • Identification of specific markers like Birbeck granules, Lag antigen, E-cadherin, CD2, CD9, CD68, and coagulation factor XIIIa.
  • Assessment of T cell stimulation capacity.
  • Induction of differentiation into macrophage-like cells using M-CSF.

Main Results:

  • Two distinct DC precursor subsets, CD1a+ and CD14+, emerge independently at days 5-7.
  • Both subsets mature into DCs with typical morphology and phenotype by days 12-14.
  • CD1a+ precursors differentiate into Langerhans-like cells (Birbeck granules, Lag antigen, E-cadherin).
  • CD14+ progenitors differentiate into CD1a+ DCs resembling dermal DCs (CD2, CD9, CD68, factor XIIIa).
  • Both mature DC types effectively stimulate naive T cells.
  • CD14+ precursors are bipotent, differentiating into macrophages with M-CSF, while CD1a+ precursors are not.

Conclusions:

  • Human CD34+ hematopoietic progenitors differentiate into at least two distinct DC lineages: Langerhans cells and dermal/circulating DCs.
  • The CD14+ precursor subset exhibits bipotency, capable of generating both DCs and macrophages.
  • These findings elucidate the diverse developmental pathways of human DCs and their potential in vivo counterparts.

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