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The I-J glycoprotein: genetic control, biochemistry, and function.

C E Hayes, K K Klyczek

    Immunological Reviews
    |April 1, 1985
    PubMed
    Summary

    The I-J molecule, a mannosylated protein, plays a role in T cell interactions and immune regulation. Its expression and function are genetically controlled, potentially involving host environment interactions during T cell maturation.

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    Area of Science:

    • Immunology
    • Molecular Biology
    • Genetics

    Background:

    • The I-J molecule is a mannosylated protein expressed during T cell development.
    • Both cellular and secreted forms of I-J are involved in genetically-restricted T cell interactions.
    • Soluble I-J lacks an antigen-binding site but associates with one, while cellular I-J is near T cell receptor complexes.

    Purpose of the Study:

    • To investigate the genetic control and expression of the I-J molecule.
    • To explore the role of host environment factors in I-J determinant formation.
    • To elucidate the relationship between I-J expression and T cell maturation.

    Main Methods:

    • Analysis of I-J molecule expression and molecular weight.
    • Genetic mapping of I-J expression control.
    • Investigation of host gene products' influence on I-J synthesis.

    Main Results:

    • I-J molecule has a molecular weight of 25-30,000 Da.
    • At least two genes, one in I-E and another on chromosome 4, control T cell I-Jk expression.
    • Host I-E gene products may regulate I-J expression during T cell maturation, potentially via interaction with thymic cells.

    Conclusions:

    • The I-J molecule is a key component in T cell interactions and immune regulation.
    • Genetic control of I-J expression is complex, involving multiple loci and potentially host factors.
    • Further research is needed to definitively prove the proposed mechanisms of I-J regulation and function.

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