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Related Experiment Videos

Requirement for invariant chain in B cell maturation and function

I Shachar1, R A Flavell

  • 1Section of Immunobiology, Yale University School of Medicine, New Haven, CT 06510, USA.

Science (New York, N.Y.)
|October 4, 1996
PubMed
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Invariant chain (Ii) is essential for B cell maturation and development. Mice lacking Ii exhibit impaired B cell responses and a developmental block, highlighting Ii's critical role beyond its chaperone function.

Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • The invariant chain (Ii) was traditionally recognized for its role in the folding and transport of major histocompatibility complex class II molecules.
  • Its broader functions in immune cell development were not fully understood.

Purpose of the Study:

  • To investigate the role of the invariant chain (Ii) in B cell development and maturation.
  • To determine if Ii has functions independent of its role in MHC class II presentation.

Main Methods:

  • Analysis of B cells from mice genetically engineered to lack the invariant chain (Ii).
  • Assessment of B cell responses to T-independent type II antigen.
  • Flow cytometry analysis of cell surface markers to identify developmental stages.

Related Experiment Videos

  • Evaluation of B cell proliferation following antigen injection.

    • Main Results:

    • Mice lacking Ii displayed significantly reduced B cell responses to T-independent type II antigen.
    • A developmental arrest was observed, preventing immature B cells from maturing into peripheral B cells.
    • This developmental block was independent of major histocompatibility complex class II expression.
    • The severity of the block correlated with the amount of Ii present, indicating an intrinsic role.

    Conclusions:

    • The invariant chain (Ii) is crucial for normal B cell development and maturation.
    • Ii plays a significant role in B cell maturation that is independent of its function in MHC class II pathways.
    • Further research is needed to elucidate the precise mechanism by which Ii influences B cell maturation.