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Related Experiment Videos

Class I-restricted presentation occurs without internalization or processing of exogenous antigenic peptides.

N A Hosken1, M J Bevan, F R Carbone

  • 1Department of Immunology, Research Institute of Scripps Clinic, La Jolla, California 92037.

Journal of Immunology (Baltimore, Md. : 1950)
|February 15, 1989
PubMed
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Glutaraldehyde-fixed cells can present exogenous antigenic peptides to cytotoxic T lymphocytes (CTL) without intracellular processing. This suggests direct peptide binding to class I major histocompatibility complex (MHC) molecules on the cell surface is sufficient for CTL recognition.

Area of Science:

  • Immunology
  • Cellular immunology
  • T cell recognition

Background:

  • Previous research indicated glutaraldehyde-fixed cells present fragmented antigens to class II-restricted T cells via direct peptide binding.
  • Viable cells present endogenous antigens with class I major histocompatibility complex (MHC) molecules to cytotoxic T lymphocytes (CTL).
  • Exogenous native antigens are not recognized by CTL when presented by viable target cells, suggesting intracellular processing is necessary.

Purpose of the Study:

  • To investigate whether exogenous peptides require internalization and processing for presentation to CTL.
  • To determine if glutaraldehyde-fixed cells can present synthetic peptides to MHC class I-restricted CTL.
  • To elucidate the mechanism of antigenic peptide presentation to CTL.

Main Methods:

Related Experiment Videos

  • Derivation of CTL specific for a chicken ovalbumin (OVA) peptide (OVA258-276) associated with H-2Kb.
  • Loading glutaraldehyde-fixed cells with synthetic peptides of varying lengths (16-48 amino acids).
  • Assessing CTL recognition of fixed cells presenting synthetic peptides and comparing it to presentation of viral antigens.

Main Results:

  • Glutaraldehyde-fixed cells successfully presented synthetic peptides to H-2Kb- and H-2Db-restricted CTL.
  • Peptide presentation by fixed cells did not require internalization or processing.
  • Fixed cells failed to present viral antigens (influenza nucleoprotein, OVA) if fixed within 1 hour of infection or loading, indicating a time-dependent process for native antigens.

Conclusions:

  • Antigenic peptides can bind directly to class I MHC molecules on the cell surface for CTL recognition.
  • Intracellular processing is not required for CTL recognition of exogenous synthetic peptides.
  • The mechanism of antigen presentation differs for synthetic peptides versus native antigens, particularly concerning processing requirements.