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Related Experiment Videos

B cells extract and present immobilized antigen: implications for affinity discrimination.

F D Batista1, M S Neuberger

  • 1Medical Research Council Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, UK.

The EMBO Journal
|February 17, 2000
PubMed
Summary

B cells can internalize and present particulate or surface-tethered antigens, influencing how they detect antigen-BCR affinity. This impacts the initiation and maturation of the humoral immune response.

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Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • B-cell antigen receptor (BCR) binding initiates antigen internalization and T cell presentation, crucial for humoral immunity.
  • In vivo, antigens are often insoluble or cell-surface tethered, unlike previously studied soluble antigens.

Purpose of the Study:

  • To investigate B cell antigen uptake and presentation of particulate and surface-tethered antigens.
  • To determine how antigen form influences B cell discrimination of antigen-BCR affinity.

Main Methods:

  • Utilized particulate and surface-tethered antigens to study B cell antigen uptake.
  • Assessed B cell antigen presentation efficiency across varying antigen-BCR affinities.

Main Results:

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  • B cells can internalize and present large particulate antigens, requiring a signaling-competent BCR.
  • B cells can extract and present antigens from non-internalizable surfaces.
  • Antigen presentation efficiency is modulated by antigen form and BCR affinity.

Conclusions:

  • Antigen presentation by B cells is adaptable to various antigen forms, including insoluble and tethered antigens.
  • The presentation of antigens from non-internalizable surfaces shows a broader dependence on antigen-BCR affinity.
  • Findings offer insights into the initiation and affinity maturation of humoral immune responses.