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Related Experiment Videos

Functional differences between dendritic cells derived from CD34+ bone marrow and peripheral blood stem cells.

F Servida1, D Soligo, G Lambertenghi Deliliers

  • 1Fondazione Matarelli, Ospedale Maggiore I.R.C.C.S., Università degli Studi di Milano, Milan, Italy.

Haematologica
|April 11, 2000
PubMed
Summary

Bone marrow-derived dendritic cells (DCs) efficiently internalize antigens, while peripheral blood stem cell-derived DCs are functionally mature. Both types show enhanced immune stimulation after tumor necrosis factor-alpha (TNFa) treatment, suggesting distinct therapeutic applications.

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Area of Science:

  • Immunology
  • Cell Biology
  • Biotechnology

Background:

  • Dendritic cells (DCs) exist in immature (high antigen uptake) and mature (immunostimulatory) states.
  • Tumor necrosis factor-alpha (TNFa) induces in vitro maturation of DCs.

Purpose of the Study:

  • Investigate maturation steps of DCs derived from CD34(+) cells from peripheral blood stem cells (PBSC) and bone marrow (BM).
  • Compare antigen uptake and allostimulatory capacity of BM-derived vs. PBSC-derived DCs.

Main Methods:

  • In vitro generation of DCs from PBSC and BM CD34(+) cells.
  • Measurement of endocytic activity (dextran-FITC uptake) and alloreactivity (mixed leukocyte reactions).
  • Immunophenotypic analysis by flow cytometry.

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Main Results:

  • PBSC-derived DCs showed no soluble antigen uptake, unlike BM-derived DCs.
  • Both DC types exhibited comparable allostimulatory activity at day 10, significantly enhanced by TNFa at day 14.
  • TNFa treatment increased co-stimulatory molecule expression on DCs.

Conclusions:

  • BM-derived DCs are suitable for peptide pulsing due to their antigen-presenting capacity.
  • PBSC-derived DCs, being functionally mature, are potentially better for gene therapy applications.