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Related Experiment Videos

Dendritic cell development from common myeloid progenitors.

M G Manz1, D Traver, K Akashi

  • 1Department of Pathology and Developmental Biology, B261 Beckman Center, Stanford University School of Medicine, 279 Campus Drive, Stanford, California 94305-5428, USA. manz@stanford.edu

Annals of the New York Academy of Sciences
|July 19, 2001
PubMed
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Dendritic cells (DCs) CD8 alpha expression doesn't indicate lymphoid origin. Instead, differences in CD8 alpha+ and CD8 alpha- DCs may reflect maturation status, with most DCs being myeloid-derived.

Area of Science:

  • Immunology
  • Hematopoiesis
  • Cell Biology

Background:

  • Dendritic cells (DCs) are crucial antigen-presenting cells initiating immune responses and self-tolerance.
  • Distinct DC subsets, defined by CD8 alpha and Mac-1 expression, were hypothesized to originate from lymphoid and myeloid lineages, respectively.
  • This model suggested different DC origins dictate their immune functions.

Purpose of the Study:

  • To investigate the ontogeny and lineage commitment of CD8 alpha+ and CD8 alpha- dendritic cells (DCs).
  • To determine if CD8 alpha expression reliably indicates a lymphoid origin for DCs.
  • To clarify the relationship between DC subsets, maturation, and hematopoietic origin.

Main Methods:

  • Transplantation studies using clonogenic common myeloid progenitors (CMPs).

Related Experiment Videos

  • Analysis of DC populations in thymus and spleen.
  • Characterization of CD8 alpha and Mac-1 expression on DCs.

    • Main Results:

    • Both CD8 alpha+ and CD8 alpha- DCs can develop from common myeloid progenitors (CMPs).
    • CD8 alpha expression on DCs does not signify a lymphoid origin.
    • Differences between CD8 alpha+ and CD8 alpha- DCs likely represent maturation stages, not distinct lineages.
    • Transplantation studies suggest a predominant myeloid origin for most DCs in lymphoid organs and the thymus.

    Conclusions:

    • The origin of dendritic cells (DCs) is primarily myeloid, challenging the lymphoid vs. myeloid origin model based on CD8 alpha expression.
    • DC subset differentiation is more likely linked to maturation status than to distinct lymphoid or myeloid hematopoietic origins.
    • Most DCs in secondary lymphoid organs and a significant portion in the thymus are likely myeloid-derived.