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Related Experiment Videos

Plasma cells tumors decrease CD23 mRNA expression in vivo in murine splenic B cells

M C Ruzek1, A Mathur

  • 1Department of Microbiology, University of Minnesota, Minneapolis 55455, USA.

European Journal of Immunology
|August 1, 1995
PubMed
Summary
This summary is machine-generated.

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IgE-secreting tumors maintain B cell CD23 expression via a post-transcriptional mechanism, even when tumor cells reduce CD23 mRNA. This IgE-dependent effect preserves surface CD23 protein levels.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cancer Research

Background:

  • CD23 (low-affinity Fc receptor for IgE) is normally lost upon B cell activation.
  • Previous studies showed decreased CD23 on B cells in mice with plasma cell tumors.
  • The role of IgE-secreting tumors in CD23 regulation was unclear.

Purpose of the Study:

  • To investigate the effect of IgE-secreting tumors on CD23 expression in host B cells.
  • To determine the mechanism by which CD23 expression is regulated in the presence of these tumors.

Main Methods:

  • Comparison of CD23 surface protein and mRNA levels in B cells from tumor-bearing mice and normal mice.
  • Analysis of B cells from mice with both plasma cell tumors and IgE-secreting tumors.
  • Investigating the role of direct cell contact and IgE presence.

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Main Results:

  • IgE-secreting tumors did not cause a loss of surface CD23 expression on splenic B cells.
  • Decreased CD23 mRNA levels were observed in B cells from mice with IgE-secreting tumors.
  • Surface CD23 protein levels were maintained in the presence of IgE, independent of tumor type.

Conclusions:

  • IgE secreted by plasma cell tumors maintains normal surface CD23 expression on B cells.
  • This maintenance occurs via a post-transcriptional mechanism, overriding CD23 mRNA down-regulation.
  • IgE is the sole factor responsible for preserving CD23 surface levels in this context.