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Membrane-bound IgM obstructs B cell development in transgenic mice.

W Müller1, U Rüther, P Vieira

  • 1Institute for Genetics, University of Cologne, FRG.

European Journal of Immunology
|May 1, 1989
PubMed
Summary
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Transgenic mice expressing secreted IgM (T microsecond) showed normal B cell populations. However, mice expressing membrane IgM (T micron) had severely impaired B cell development, with depleted bone marrow and altered spleen B cell populations.

Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Immunoglobulin M (IgM) exists in secreted and membrane-bound forms, crucial for B cell function.
  • Understanding the distinct roles of these IgM forms requires genetic manipulation in vivo.

Purpose of the Study:

  • To investigate the impact of transgenic expression of secreted (microsecond) versus membrane-bound (micron) IgM on B cell development in mice.
  • To analyze lymphocyte populations in mice engineered to express specific forms of IgM.

Main Methods:

  • Generation of transgenic mice with rearranged immunoglobulin genes encoding secreted or membrane IgM.
  • Phenotypic analysis of lymphocyte populations (B cells and T cells) in T microsecond and T micron mice.
  • Flow cytometry to assess B cell frequencies, surface immunoglobulin expression (IgM, IgD), and distribution in lymphoid organs.

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Main Results:

  • T microsecond mice exhibited normal or slightly reduced B cell frequencies across compartments.
  • T micron mice displayed severe B cell developmental defects, with significant depletion in bone marrow and spleen.
  • Spleens of T micron mice showed an enrichment of B cells with reduced surface IgD levels, while endogenous IgM was expressed.

Conclusions:

  • The membrane-bound form of IgM (micron) is critical for normal B cell development and homeostasis.
  • Secreted IgM (microsecond) does not appear to be essential for B cell development, as its transgenic expression did not disrupt B cell populations.
  • Disruption of B cell development in T micron mice highlights the essential role of membrane IgM in B cell maturation and signaling.