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Related Experiment Videos

Antigen entry into early endosomes is insufficient for MHC class II processing

W L Niebling1, S K Pierce

  • 1Department of Biochemistry, Molecular Biology and Cell Biology, Northwestern University, Evanston, IL 60208.

Journal of Immunology (Baltimore, Md. : 1950)
|April 1, 1993
PubMed
Summary

Antigen presentation by T-cells requires antigen processing. Binding antigens to the transferrin receptor (TfR) normally does not enhance processing, but cross-linking the TfR redirects antigens to compartments that efficiently process them.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Helper T-cell recognition of antigens (Ag) depends on processing and presentation by antigen-presenting cells (APCs) via MHC class II molecules.
  • Antigen processing involves proteolysis in acidic compartments, generating peptides that bind to MHC class II.
  • While pinocytosis allows Ag entry, binding Ag to APC surface structures enhances processing efficiency by delivering Ag to appropriate compartments.

Purpose of the Study:

  • To investigate whether antigen binding to the transferrin receptor (TfR) influences antigen processing and presentation.
  • To determine if the normal endosomal cycling pathway of TfR is involved in antigen processing.
  • To explore if altering TfR trafficking through cross-linking affects antigen processing and presentation.

Main Methods:

Related Experiment Videos

  • Covalent coupling of cytochrome c (c) to transferrin (Tf) to create c-Tf, targeting the TfR.
  • Assessing processing and presentation of c-Tf compared to unconjugated c.
  • Investigating the effect of TfR cross-linking on c-Tf processing and presentation using polymerized Tf and c-specific antibodies.

Main Results:

  • Antigen (cytochrome c) coupled to transferrin (c-Tf) showed no significant increase in processing or presentation compared to unconjugated c, indicating TfR's normal cycling pathway bypasses processing compartments.
  • TfR binding and cycling kinetics of c-Tf were similar to unmodified Tf, with no significant degradation.
  • Cross-linking the TfR with c-Tf led to efficient antigen processing and presentation, suggesting diversion to different endosomal compartments.

Conclusions:

  • The standard endosomal compartments utilized by the transferrin receptor are not sites for efficient antigen processing.
  • Altering transferrin receptor trafficking via cross-linking diverts bound antigens to compartments that facilitate efficient processing and presentation.
  • This suggests a mechanism for targeted antigen delivery to enhance T-cell immune responses.