Cell-Mediated Effector Responses and TH-Cell Differentiation Quiz

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Questions and Answers

Which receptor binds to ICAM?

  • MHC/Ag
  • FcR
  • TCR/CD3 complex
  • LFA-1 integrin (correct)

What facilitates the entry of granzymes into the target cell?

  • TCR/CD3 complex interaction
  • FcR recognition
  • Perforin-mediated pore formation (correct)
  • MHC/Ag binding

Which cells use similar mechanisms to kill target cells as NK cells?

  • NK cells (correct)
  • Macrophages
  • CD4+ T cells
  • Neutrophils

What mechanism is used by NK cells, macrophages, neutrophils, and eosinophils to eliminate pathogens?

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

What contributes to pathogen clearance through direct killing by CTL or NK cells?

<p>Cellular effector responses (D)</p> Signup and view all the answers

Which type of cells collaborate as bridges with cellular responses?

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

What do macrophages eliminate once activated by T cells?

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

What is the main regulator of NK cell activation?

<p>IL12 and IL-15 cytokines (C)</p> Signup and view all the answers

Which molecule acquires high avidity for its ligand after antigen recognition?

<p>LFA-1 integrin receptor (D)</p> Signup and view all the answers

Which mechanism leads to DNA fragmentation and does not require mRNA or protein synthesis?

<p>Proteolytic activity of granzymes (C)</p> Signup and view all the answers

What is the function of Helper T cells?

<p>Producing a distinct cytokine profile (B)</p> Signup and view all the answers

How do CTLs recognize foreign antigens?

<p>Through TCR recognition of antigens presented on MHC class I molecules (B)</p> Signup and view all the answers

What is the role of IL-2 in CTL activation?

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

How do NK cells recognize target cells?

<p>By activating and inhibitory receptors (C)</p> Signup and view all the answers

What are the pathways involved in the destruction of target cells by CTLs?

<p>Perforin/granzyme pathways (C)</p> Signup and view all the answers

What is the function of TH17 subset of Helper T cells?

<p>Producing a distinct cytokine profile (B)</p> Signup and view all the answers

What is the primary function of TFH subset of Helper T cells?

<p>Regulating distinct activities within the body (A)</p> Signup and view all the answers

What is the main function of TREG subset of Helper T cells?

<p>Regulating distinct activities within the body (A)</p> Signup and view all the answers

What is the role of ADCC and IgE-mediated activation of eosinophils in helminthic infections?

<p>Activating eosinophils to combat helminthic infections (A)</p> Signup and view all the answers

What are the events in the destruction of target cells by CTLs?

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

Flashcards

ICAM receptor

LFA-1 integrin is a receptor that binds to ICAM molecules.

Granzyme entry

Perforin creates pores in the target cell membrane allowing granzymes to enter.

Target cell killing mechanism

CTLs and NK cells use similar mechanisms like perforin and granzymes for killing target cells.

Pathogen elimination

NK cells, macrophages, neutrophils, eosinophils eliminate pathogens using lytic enzymes.

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Cellular effector responses

Direct killing by CTLs or NK cells helps remove pathogens.

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Cellular bridges

B cells act as bridging cells in cellular responses.

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Macrophage activation

T cells activate macrophages to eliminate intracellular pathogens.

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NK cell activation

IL-12 and IL-15 cytokines regulate NK cell activation.

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High avidity binding

Antigen recognition enhances LFA-1 integrin's binding strength.

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DNA fragmentation mechanism

Granzymes cause DNA fragmentation in target cells, without protein synthesis.

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Helper T cell function

Helper T cells produce specific cytokine profiles.

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CTL antigen recognition

CTLs recognize foreign antigens presented on MHC class I molecules via their TCR.

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CTL activation

IL-2 induces proliferation of CTLs during activation.

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NK cell target recognition

NK cells identify targets using activating and inhibitory receptors.

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CTL target destruction

CTLs use the perforin/granzyme pathways to destroy target cells.

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TH17 function

TH17 subset produces cytokines that influence inflammation and immune response.

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TFH function

TFH cells regulate unique processes within the immune system.

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TREG function

TREG cells regulate immune responses within the body.

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ADCC and IgE roles

ADCC and IgE activation of eosinophils combat helminthic infections.

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CTL target destruction events

Conjugate formation is an early step in CTL target cell destruction.

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