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Related Experiment Videos

Protein synthesis in antigen processing.

P E Jensen1

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

Journal of Immunology (Baltimore, Md. : 1950)
|October 15, 1988
PubMed
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Protein synthesis is essential for accessory cells to process antigens like insulin for T cell recognition. Inhibiting protein synthesis impairs antigen processing and T cell activation.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Antigen (Ag) processing by accessory cells (APCs) is crucial for T cell recognition.
  • Class II-restricted T cells recognize Ags processed through chloroquine-sensitive pathways.

Purpose of the Study:

  • To investigate the role of protein synthesis in the intracellular processing of insulin and other antigens by macrophages.
  • To determine if protein synthesis is required for optimal antigen processing and subsequent T cell activation.

Main Methods:

  • Treatment of adherent macrophages with protein synthesis inhibitors before and during antigen exposure.
  • Assessment of APC ability to activate murine T cell hybridomas.
  • Analysis of antigen uptake, intracellular processing, and presentation.

Main Results:

Related Experiment Videos

  • Protein synthesis is required for optimal accessory cell-dependent processing of insulin and other antigens.
  • Inhibition of protein synthesis in APCs reduces their capacity to activate T cells.
  • The effect is localized to intracellular processing, not uptake or presentation, and is reversible.
  • A lag period is observed between protein synthesis inhibition and impaired processing.

Conclusions:

  • Newly synthesized proteins are necessary for efficient intracellular antigen processing.
  • This requirement may involve maintaining labile proteins or facilitating the association of antigens with newly synthesized class II histocompatibility molecules.