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Does the IL-2 receptor alpha chain induced on dendritic cells have a biological function?

V Kronin1, D Vremec, K Shortman

  • 1The Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria, Australia.

International Immunology
|April 9, 1998
PubMed

Insights

The inducible Interleukin-2 receptor (IL-2R) alpha chain on dendritic cells (DCs) is not essential for T cell stimulation or immune regulation. Studies show IL-2R alpha null dendritic cells function similarly to normal DCs in T cell proliferation.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • The Interleukin-2 receptor (IL-2R) alpha chain (CD25) is induced on dendritic cells (DCs) during culture.
  • The role of this inducible IL-2R alpha in DC function and T cell responses remains unclear.

Purpose of the Study:

  • To investigate the functional significance of inducible IL-2R alpha on dendritic cells.
  • To determine if IL-2R alpha is required for dendritic cell development, T cell stimulation, or immune regulation.

Main Methods:

  • Dendritic cells were isolated from IL-2R alpha gene-disrupted (null) mutant mice and compared with wild-type dendritic cells.
  • The ability of these dendritic cells to stimulate proliferation of allogeneic CD4 and CD8 T cells was assessed in vitro.
  • Subsets of dendritic cells (CD8 alpha+ and CD8 alpha-) were analyzed separately.

Main Results:

  • IL-2R alpha null dendritic cells and normal dendritic cells induced nearly identical proliferative responses in both CD4 and CD8 T cells.
  • Separated CD8 alpha+ and CD8 alpha- subsets from IL-2R alpha null dendritic cells also showed proliferative responses similar to their normal counterparts.
  • No significant differences were observed in T cell stimulation or regulation between IL-2R alpha null and normal dendritic cells.

Conclusions:

  • The inducible IL-2R alpha on dendritic cells is not required for dendritic cell development.
  • Inducible IL-2R alpha on dendritic cells does not play a critical role in the stimulation of T cell proliferation.
  • There is no evidence to suggest that inducible IL-2R alpha on dendritic cells is necessary for the regulation of T cell responses.

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