Final T cell lecture: negative regulation
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Questions and Answers

Which molecule is involved in down-regulating T cell activation by binding to B7.1/2 with higher affinity than CD28?

  • TGF-b
  • CTLA-4 (correct)
  • PD-1
  • IL-10

What is the function of CTLA-4 in activated T cells?

  • Promote cell growth
  • Enhance IL-2 production
  • Activate APCs
  • Inhibit proliferation (correct)

Do effector T cells require costimulatory signals?

  • Effector T cells require costimulatory signals only in the presence of APCs
  • Yes, they always require costimulatory signals
  • Effector T cells sometimes require costimulatory signals
  • No, they never require costimulatory signals (correct)

Which pathway of cell death is triggered by the Fas-FasL pathway involving CTLs?

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

Which type of Tregs arise in the periphery from CD4+ T cells?

<p>Induced (adaptive) Tregs (A)</p> Signup and view all the answers

What is the role of ILC2 and TH2 cells in infections?

<p>Producing a trio of cytokines (B)</p> Signup and view all the answers

Which molecule is expressed on activated T cells and down-regulates T cell activation?

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

What function do Treg cells serve in immune responses?

<p>Inhibiting immune responses (C)</p> Signup and view all the answers

What is the main function of Treg cells?

<p>Negatively regulate immune responses (C)</p> Signup and view all the answers

When does clonal contraction occur in the immune response?

<p>After the antigen is cleared (A)</p> Signup and view all the answers

Which molecule binds PDL-1 and PDL-2 to down-regulate T cell activation?

<p>PD-1 (D)</p> Signup and view all the answers

Which cytokines are produced by ILC3 cells to defend against bacterial infection?

<p>IL-17 (A)</p> Signup and view all the answers

What is the main function of IL-10 and TGF-b in the context of immune responses?

<p>Suppress immune responses (A)</p> Signup and view all the answers

What happens to most lymphocytes after an antigen is removed?

<p>They undergo apoptosis (D)</p> Signup and view all the answers

What happens to B7 molecules when CTLA-4 binds to them?

<p>B7 molecules are sequestered and prevent binding to CD28 (B)</p> Signup and view all the answers

Which type of infection do ILC2 and TH2 cells assist in clearing?

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

What contributes to the activation of ILCs?

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

What do effector T cells do once they have been activated, proliferated, and differentiated?

<p>Require signals from APCs again (B)</p> Signup and view all the answers

What happens to newly generated B and T cells at the end of the primary immune response?

<p>They are lost (D)</p> Signup and view all the answers

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