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Expression of IL-2 receptor p55 and p75 chains by human B lymphocytes: effects of activation and differentiation

H Zola1, H Weedon, G R Thompson

  • 1Department of Clinical Immunology, Flinders Medical Centre, Bedford Park, South Australia.

Immunology
|February 1, 1991
PubMed

Insights

Human B cells express interleukin-2 receptor (IL-2R) chains upon activation. While blood B cells show expression, tonsil B cells require culture and protein synthesis for low-level IL-2R p55 chain detection.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Interleukin-2 receptor (IL-2R) is crucial for T cell proliferation and function.
  • Expression of IL-2R on B cells is less understood compared to T cells.

Purpose of the Study:

  • To investigate the expression of IL-2R p55 and p75 chains on human B cells.
  • To determine the modulation of IL-2R expression by B cell activation factors.

Main Methods:

  • High-sensitivity immunofluorescence was used to detect IL-2R expression.
  • Tonsil B cells were cultured with various B cell activators.
  • Flow cytometry was employed to analyze cell surface marker expression.

Main Results:

  • Fresh tonsil B cells showed no detectable IL-2R expression.
  • Cultured tonsil B cells exhibited low-level p55 chain expression, dependent on protein synthesis.
  • IL-4, IL-2, and TNF-beta modulated p55 levels, while IL-5 did not.
  • IL-2R expression changes were minor compared to CD23 activation marker.
  • T-cell blasts showed the most significant p55 expression upon polyclonal stimulation.

Conclusions:

  • Human B cells can express IL-2R, particularly the p55 chain, upon activation in vitro.
  • IL-2R expression on B cells is influenced by specific cytokines and activation signals.
  • IL-2R expression on B cells is generally low and less pronounced than on activated T cells.

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