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Related Experiment Videos

Ig biosynthesis in a human pre-B cell line.

J M McCune, S M Fu

    Journal of Immunology (Baltimore, Md. : 1950)
    |December 1, 1981
    PubMed
    Summary

    This study shows that a human lymphoblastoid cell line synthesizes both membrane and secreted IgM heavy chains, but lacks light chain production. Supplying light chains enabled surface expression of IgM, offering insights into B cell development.

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    Area of Science:

    • Immunology
    • Molecular Biology
    • Cell Biology

    Background:

    • B cell development involves complex immunoglobulin (Ig) synthesis and expression.
    • Understanding the regulation of IgM heavy and light chain synthesis is crucial for B cell differentiation.

    Purpose of the Study:

    • To investigate immunoglobulin M (IgM) synthesis in a human Epstein-Barr virus-transformed lymphoblastoid cell line (Josh 4).
    • To determine the presence and synthesis of membrane-bound (IgM) and secreted (IgM) heavy chains and light chains.
    • To explore the role of light chains in the surface expression of IgM.

    Main Methods:

    • Cell-free translation of extracted RNA using a wheat germ system.
    • Pulse-labeling of cells with 35S-methionine followed by immunoprecipitation.
    • Enzymatic digestion with endo-N-acetylglucosaminidase.
    • Somatic cell hybridization with light chain-producing lines.

    Main Results:

    • Transcripts for both membrane and secreted IgM heavy chains (mu-chains) were detected in approximately equal proportions.
    • Both mu-chains were synthesized and glycosylated intracellularly.
    • No light chain synthesis was detected in the Josh 4 cell line.
    • Hybrid cells formed with light chain-producing lines expressed surface IgM, indicating light chain provision enabled membrane expression.

    Conclusions:

    • The Josh 4 cell line synthesizes and secretes both forms of IgM heavy chains but requires external light chains for surface display.
    • Light chain provision can rescue potentially degradable mu-chains, facilitating their membrane expression.
    • These findings provide insights into the intricate processes governing normal B cell development and immunoglobulin expression.

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