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Requirement for protein synthesis in antigen processing by B cells

K M Soreng1, J C Moore, M A Sherman

  • 1Department of Pathology, Emory University School of Medicine, Atlanta, Georgia 30322.

Cellular Immunology
|August 1, 1994
PubMed

Insights

De novo protein synthesis is crucial for B cell antigen (Ag) processing. Transformed B cells maintain antigen presentation longer due to a stable pool of class II/invariant chain (Ii) complexes, even after protein synthesis stops.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • B cells process antigens for immune responses.
  • De novo protein synthesis is essential for antigen processing by B cells.

Purpose of the Study:

  • To investigate the role of de novo protein synthesis in B cell antigen processing.
  • To compare antigen processing in normal splenic B cells and transformed B lymphoblastoid cells.

Main Methods:

  • Treatment with cycloheximide (CHX) to inhibit protein synthesis.
  • Immunoprecipitation to analyze class II/invariant chain (Ii) complexes.
  • Assessment of antigen processing function.

Main Results:

  • Cycloheximide (CHX) inhibited antigen processing in both normal and transformed B cells.
  • B lymphoblastoid cells showed a longer inhibition time compared to splenic B cells.
  • Transformed cells possess a long-lived pool of class II/Ii complexes, enabling prolonged peptide binding and presentation post-protein synthesis inhibition.

Conclusions:

  • De novo protein synthesis is vital for B cell antigen processing.
  • Transformed B cells exhibit enhanced antigen presentation capabilities due to stable class II/Ii complexes.
  • A long-lived pool of class II/Ii complexes in B lymphoblastoid cells contributes to sustained antigen presentation.

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