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Related Experiment Videos

Epitope-directed processing of specific antigen by B lymphocytes.

H W Davidson1, C Watts

  • 1Department of Biochemistry, The University, Dundee, United Kingdom.

The Journal of Cell Biology
|July 1, 1989
PubMed
Summary

This study shows that B-lymphoblastoid cells process antigens through a lysosomal pathway. Antigen degradation and fragmentation depend on specific epitopes and B cell lines, impacting antigen presentation.

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Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • B-lymphoblastoid cells express membrane IgG for antigen recognition.
  • Receptor-mediated endocytosis internalizes antigens bound to membrane receptors.

Purpose of the Study:

  • To investigate the proteolytic processing of specific antigens by Epstein Barr virus transformed B-lymphoblastoid cells.
  • To understand the mechanisms and factors influencing antigen degradation and fragmentation within B cells.

Main Methods:

  • Utilizing Epstein Barr virus transformed B-lymphoblastoid cells expressing membrane IgG against tetanus toxin.
  • Employing receptor-mediated endocytosis, metabolic inhibitors, chloroquine, and lysosomal protease inhibitors (leupeptin, E-64, pepstatin A).
  • Analyzing antigen degradation via acid-soluble radiolabel release and SDS-PAGE with autoradiography.

Main Results:

  • Antigen degradation occurred after a 10-20 min lag phase at 37 degrees C, following endocytosis.
  • Degradation was inhibited by metabolic inhibitors, low temperatures, chloroquine, and specific lysosomal protease inhibitors.
  • SDS-PAGE revealed time-dependent generation of antigen fragments, immunoprecipitated by anti-human IgG, indicating the antigen/mIg complex as the substrate.
  • Fragmentation patterns varied based on the antigen epitope and Fabs complexation.

Conclusions:

  • Proteolytic processing of membrane-bound antigens occurs via a lysosomal pathway in B cells.
  • The observed antigen fragmentation is dependent on the specific antigen epitope and the B cell line.
  • These findings have implications for major histocompatibility complex (MHC) restricted antigen presentation and intracellular trafficking of ligand/receptor complexes.

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