Lecture 16/17
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Questions and Answers

What is required for T cell activation, survival, and proliferation?

  • CD3 zeta chains
  • Costimulation (correct)
  • Zap-70 Kinase
  • Lck kinase
  • Which receptors help in turning off T cell activation?

  • CD28 and CD3
  • CD80 and CD86
  • CTLA-4 and PD-1 (correct)
  • Zap-70 Kinase and Lck kinase
  • What happens if a costimulatory signal is absent during T cell activation?

  • Increased proliferation
  • Anergy (correct)
  • Enhanced T cell response
  • Downregulation of CD28
  • Which molecule becomes non-responsive if it encounters anergy?

    <p>CD28 (B)</p> Signup and view all the answers

    What is the role of CD28 in T cell signaling?

    <p>Facilitates activation (B)</p> Signup and view all the answers

    What is the function of Zap-70 Kinase in downstream signaling?

    <p>Initiates multiple signaling cascades (C)</p> Signup and view all the answers

    What modification plays a key role in signaling pathways according to the text?

    <p>Phosphorylation (D)</p> Signup and view all the answers

    What leads to the recruitment of Lck kinase in intracellular signaling?

    <p>CD28 binding to costimulatory ligands (C)</p> Signup and view all the answers

    Which event triggers the phosphorylation of the CD28 receptor?

    <p>Binding to B7 molecules (CD80/86) (B)</p> Signup and view all the answers

    What happens to T cells when negative costimulation occurs?

    <p>Turned off and lead to anergy (D)</p> Signup and view all the answers

    What is the key modification involved in signaling, as mentioned in the text?

    <p>Phosphorylation (A)</p> Signup and view all the answers

    Which type of receptor signaling is initiated by recruitment of another kinase and dimerization followed by transphosphorylation?

    <p>Extrinsic kinase activity (A)</p> Signup and view all the answers

    What type of domain can recognize phosphorylated tyrosine on other proteins?

    <p>SH2 domain (B)</p> Signup and view all the answers

    Which proteins are targeted for degradation by the proteasome or in lysosomes?

    <p>Ubiquitinated proteins (C)</p> Signup and view all the answers

    What are proteins that dephosphorylate other proteins called?

    <p>Phosphatases (C)</p> Signup and view all the answers

    Which modification can function to both activate and inhibit signaling?

    <p>Ubiquitination (A)</p> Signup and view all the answers

    What is required for optimal T-cell activation and proliferation according to the text?

    <p>All three signals: pMHC:TCR engagement, costimulatory ligands, and cytokines (C)</p> Signup and view all the answers

    In which signal does TCR binding initiate signaling?

    <p>Signal 1 (B)</p> Signup and view all the answers

    What is the role of CD28 in T cell signaling?

    <p>Recruits kinase and triggers phosphorylation for additional signaling (B)</p> Signup and view all the answers

    In T cell signaling, what happens if the costimulatory signal is absent?

    <p>Clonal anergy results (B)</p> Signup and view all the answers

    What function does CTLA-4 serve in T cell activation?

    <p>Turns off T cell activation (D)</p> Signup and view all the answers

    What event triggers the recruitment of Lck kinase in intracellular signaling?

    <p>Binding of costimulatory ligands on APCs (C)</p> Signup and view all the answers

    Which modification plays a vital role in turning off T cell activation according to the text?

    <p>Dephosphorylation by phosphatases (A)</p> Signup and view all the answers

    What is the result of clonal anergy in T cells?

    <p>Non-responsiveness to stimulation (C)</p> Signup and view all the answers

    How is signaling initiated in receptors with intrinsic kinase activity?

    <p>By dimerization and transphosphorylation (C)</p> Signup and view all the answers

    What is the function of SH2 domain in molecular interactions?

    <p>Recognize phosphorylated tyrosine on other proteins (D)</p> Signup and view all the answers

    Which protein modification targets proteins for degradation?

    <p>Ubiquitination (A)</p> Signup and view all the answers

    What is the role of phosphatases in signaling pathways?

    <p>Dephosphorylate other proteins (A)</p> Signup and view all the answers

    Which signal directs T-cell differentiation into distinct effector cell types?

    <p>Signal 3: Cytokines (A)</p> Signup and view all the answers

    What is required for optimal T-cell activation and proliferation?

    <p>Costimulatory signals (B)</p> Signup and view all the answers

    What triggers the formation of multimolecular complexes around adaptor proteins?

    <p>Phosphorylated tyrosines acting as binding sites (A)</p> Signup and view all the answers

    What modification plays a key role in both activating and inhibiting signaling pathways?

    <p>Phosphorylation (D)</p> Signup and view all the answers

    Which event is crucial for turning off T-cell activation?

    <p>Dephosphorylation of proteins (A)</p> Signup and view all the answers

    What is the primary purpose of adaptor proteins in intracellular signaling?

    <p>Provide binding domains for other proteins to bind to (A)</p> Signup and view all the answers

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