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Related Experiment Videos

CTL responses to H2-M3-restricted Listeria epitopes

L L Lenz1, M J Bevan

  • 1Howard Hughes Medical Institute, Department of Immunology, University of Washington, Seattle 98195, USA.

Immunological Reviews
|August 1, 1997
PubMed
Summary

Cytotoxic T cells (CTL) recognize bacterial peptides presented by MHC class Ib molecules like H2-M3. Listeria infection enhances H2-M3-restricted CTL responses, which may be primed more easily than MHC class Ia-restricted responses.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Microbial Pathogenesis

Background:

  • Cytotoxic T cells (CTL) are crucial for immune responses against Listeria monocytogenes.
  • MHC class Ia and class Ib molecules present bacterial antigens to CTL.
  • H2-M3, an MHC class Ib molecule, presents N-terminal formylmethionine (fMet) peptides from bacterial and mitochondrial proteins.

Purpose of the Study:

  • To investigate the role of H2-M3 in presenting Listeria-derived fMet peptides to CTL.
  • To understand the characteristics of fMet peptides recognized by H2-M3-restricted CTL.
  • To explore the priming requirements for H2-M3-restricted CTL responses.

Main Methods:

  • Identification of Listeria-encoded fMet peptide epitopes.
  • Analysis of fMet peptide characteristics (hydrophobicity, origin from membrane proteins).

Related Experiment Videos

  • Ex vivo stimulation of CTL using synthetic fMet peptides.

    • Main Results:

    • Listeria infection boosts H2-M3-restricted CTL responses.
    • fMet peptides are predominantly hydrophobic and derived from membrane proteins.
    • H2-M3-restricted CTL are found in a significant proportion of non-immunized mice, suggesting less stringent priming requirements compared to MHC class Ia.

    Conclusions:

    • H2-M3 plays a key role in signaling bacterial presence via fMet peptides.
    • Understanding fMet peptide selection rules can aid in predicting CTL epitopes.
    • H2-M3-restricted CTL responses may be primed more readily than MHC class Ia-restricted responses.