Antigen Presentation to T Cells
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Questions and Answers

What is the function of proteasomes in the class I MHC pathway?

  • Process peptide antigens in the cytosol (correct)
  • Degrade protein antigens in lysosomes
  • Transport peptides into the ER
  • Bind peptides to class I MHC molecules
  • Where are protein antigens degraded in the class II MHC pathway?

  • Endoplasmic reticulum
  • Cytosol
  • Lysosomes (correct)
  • ER
  • Which molecules are involved in transporting peptides into the ER in the class I MHC pathway?

  • Proteasomes
  • Lysosomes
  • Class I MHC molecules
  • TAP proteins (correct)
  • In which stage of antigen presentation do dendritic cells capture antigens for transport?

    <p>Antigen entry stage</p> Signup and view all the answers

    What is the role of dendritic cells in antigen capture and presentation?

    <p>Capture antigens and transport them to regional lymph nodes</p> Signup and view all the answers

    How do T cells recognize peptide antigens?

    <p>In the context of TCR molecules</p> Signup and view all the answers

    Which cell type transports antigens captured through the skin to regional lymph nodes?

    <p>Immature dendritic cells (DCs)</p> Signup and view all the answers

    Which proteins are responsible for producing a variety of peptides from natural proteins in the antigen processing pathway?

    <p>Proteasomes</p> Signup and view all the answers

    In cancer, mutated gene peptides are analyzed for their ability to bind to which molecules in the patient?

    <p>MHC-I molecules</p> Signup and view all the answers

    Which type of peptides are most likely to stimulate antitumor immunity in a cancer patient?

    <p>Immunodominant peptides</p> Signup and view all the answers

    Which term is used interchangeably with 'cytosolic' when referring to antigens?

    <p>'Exosomal'</p> Signup and view all the answers

    What do immunodominant peptides possess that enable them to bind to MHC molecules?

    <p>Optimal binding characteristics</p> Signup and view all the answers

    Which organelle is responsible for generating multiple peptides from protein antigens?

    <p>Endoplasmic Reticulum</p> Signup and view all the answers

    What does TAP (Transporter associated with Antigen Processing) protein function in?

    <p>Peptide transport into ER</p> Signup and view all the answers

    Where do Langerhans cells of the epidermis develop from?

    <p>Yolk sac or fetal liver</p> Signup and view all the answers

    What is the function of TAP1 and TAP2 proteins in the MHC-I antigen presentation pathway?

    <p>Translocating peptides into ER lumen</p> Signup and view all the answers

    Where are peptides that bind to MHC Class II molecules generated?

    <p>Endocytic vesicles</p> Signup and view all the answers

    Which enzyme is responsible for trimming peptides that are too long to bind to MHC-I molecules?

    <p>Endoplasmic reticulum aminopeptidase associated with antigen processing (ERAAP)</p> Signup and view all the answers

    What happens to the MHC-II/CLIP complex in the antigen presentation pathway?

    <p>It is released by binding of HLA-DM</p> Signup and view all the answers

    In which organelle do MHC-II molecules assemble with the invariant chain Ii?

    <p>Endoplasmic reticulum</p> Signup and view all the answers

    What is the essential step in the process of cross-presentation by Type 1 cDCs?

    <p>Transferring ingested antigens from vesicles into the cytosol</p> Signup and view all the answers

    Which subset of dendritic cells is specifically important for initiating responses by presenting captured antigens to CD4 + T cells?

    <p>Type 2 cDCs</p> Signup and view all the answers

    What is the major source of type I IFN and essential for innate immune responses to viruses?

    <p>Plasmacytoid DCs (pDC)</p> Signup and view all the answers

    Which dendritic cell subset is enriched in lymphoid organs and transports antigens to secondary lymphoid organs?

    <p>Conventional DCs</p> Signup and view all the answers

    Which dendritic cell type captures antigens and transports them to the spleen from the blood?

    <p>Plasmacytoid DCs (pDC)</p> Signup and view all the answers

    What is the function of Type 2 cDCs in antigen presentation?

    <p>Directly presenting antigens to CD4 + T cells</p> Signup and view all the answers

    Which dendritic cell subset is especially efficient at transferring ingested antigens from vesicles into the cytosol?

    <p>Type 1 cDCs</p> Signup and view all the answers

    Which dendritic cell subset is mainly present in most epithelia that interface with the external environment?

    <p>Conventional DCs</p> Signup and view all the answers

    What is the primary role of Plasmacytoid DCs (pDC) in innate immunity?

    <p>Generating type I interferons and responding to viruses</p> Signup and view all the answers

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