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Identification of a Pre-BCR Lacking Surrogate Light Chain

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Su,  Yu-Wen
Research Group and Chair of Molecular Immunology of the University of Freiburg, Max Planck Institute of Immunobiology and Epigenetics, Max Planck Society;

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Flemming,  Alexandra
Research Group and Chair of Molecular Immunology of the University of Freiburg, Max Planck Institute of Immunobiology and Epigenetics, Max Planck Society;

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Wossning,  Thomas
Research Group and Chair of Molecular Immunology of the University of Freiburg, Max Planck Institute of Immunobiology and Epigenetics, Max Planck Society;

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Hobeika,  Elias
Research Group and Chair of Molecular Immunology of the University of Freiburg, Max Planck Institute of Immunobiology and Epigenetics, Max Planck Society;

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Reth,  Michael
Research Group and Chair of Molecular Immunology of the University of Freiburg, Max Planck Institute of Immunobiology and Epigenetics, Max Planck Society;

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Jumaa,  Hassan
Research Group and Chair of Molecular Immunology of the University of Freiburg, Max Planck Institute of Immunobiology and Epigenetics, Max Planck Society;

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Citation

Su, Y.-W., Flemming, A., Wossning, T., Hobeika, E., Reth, M., & Jumaa, H. (2003). Identification of a Pre-BCR Lacking Surrogate Light Chain. Journal of Experimental Medicine, 198(11), 1699-1706.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002B-94D3-7
Abstract
SLP-65-/- pre-B cells show a high proliferation rate in vitro. We have shown previously that λ5 expression and consequently a conventional pre-B cell receptor (pre-BCR) are essential for this proliferation. Here, we show that pre-B cells express a novel receptor complex that contains a μ heavy chain (μHC) but lacks any surrogate (SL) or conventional light chain (LC). This SL-deficient pre-BCR (SL-pre-BCR) requires Ig-α for expression on the cell surface. Anti-μ treatment of pre-B cells expressing the SL-pre-BCR induces tyrosine phosphorylation of substrate proteins and a strong calcium (Ca2+) release. Further, the expression of the SL2+-pre-BCR is associated with a high differentiation rate toward κLC-positive cells. Given that B cell development is only partially blocked and allelic exclusion is unaffected in SL-deficient mice, we propose that the SL-pre-BCR is involved in these processes and therefore shares important functions with the conventional pre-BCR.