COPY: Cytokines Chapter 3

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Questions and Answers

What is the primary function of IL-2 in terms of cytokine-receptor interactions?

  • Endocrine signaling
  • Activation of B cells
  • T-cell activation (correct)
  • Induction of inflammatory responses

What is a characteristic of cytokines in terms of their production?

  • They are only produced by T cells
  • They are only involved in innate immunity
  • They require a stimulus for production (correct)
  • They can be produced constitutively

Which type of cytokine binding results in the activation of cells in the immediate vicinity?

  • Endocrine binding
  • Paracrine binding (correct)
  • Autocrine binding
  • Juxtacrine binding

Which of the following cytokine families includes IL-2 and IL-4?

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

What is the primary source of cytokines?

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

What is a function of cytokines secreted by TH cells?

<p>Activation of B cells, CTLs, MΦ, and NK cells (C)</p> Signup and view all the answers

What is the primary characteristic of acute phase of inflammation?

<p>Accumulation of fluid and leukocytes (C)</p> Signup and view all the answers

Which type of cytokine promotes systemic inflammation?

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

What is the primary function of anti-inflammatory cytokines?

<p>To reduce inflammation and promote healing (A)</p> Signup and view all the answers

What is the role of cytokines in host responses?

<p>To regulate host responses to infection, immune responses, inflammation, and trauma (D)</p> Signup and view all the answers

What is the effect of proinflammatory cytokines on disease?

<p>They make disease worse (D)</p> Signup and view all the answers

What is the primary difference between proinflammatory and anti-inflammatory cytokines?

<p>Proinflammatory cytokines promote inflammation, while anti-inflammatory cytokines reduce it (C)</p> Signup and view all the answers

What is a common feature among the receptors for IL-2, IL-4, and IL-7?

<p>They share a common γ chain (A)</p> Signup and view all the answers

What type of immunity is activated by Th1 cells?

<p>Cell-mediated immunity (C)</p> Signup and view all the answers

What is the consequence of cytokine binding to its receptor?

<p>Aggregation of the receptors at the cell surface (C)</p> Signup and view all the answers

Which of the following cytokines is not typically produced by Th2 cells?

<p>IL-2 (D)</p> Signup and view all the answers

What is the primary target of the cytokine IL-7?

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

What type of cytokine is IL-10?

<p>Th2 cytokine (C)</p> Signup and view all the answers

What is the role of JAKs in cytokine signaling?

<p>To phosphorylate STATs and themselves (A)</p> Signup and view all the answers

What is the effect of bacterial cell wall endotoxins on macrophages?

<p>They stimulate macrophages to produce IL-1 and TNF-α. (D)</p> Signup and view all the answers

What is the role of Th2 cells in immune responses?

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

Which cytokine is a chemokine that primarily targets neutrophils and endothelial cells?

<p>IL-8 (D)</p> Signup and view all the answers

What is the consequence of a defective γ chain in X-linked severe combined immunodeficiency disease (SCID)?

<p>Impaired cytokine signaling (D)</p> Signup and view all the answers

What type of bacteria can cause bacterial septic shock?

<p>Gram-negative bacteria. (C)</p> Signup and view all the answers

What is the result of phosphorylation of STATs by JAKs?

<p>Dimerized STATs translocate to the nucleus (A)</p> Signup and view all the answers

What is a common symptom of bacterial septic shock?

<p>A drop in blood pressure. (C)</p> Signup and view all the answers

What is the primary mechanism by which bacterial septic shock develops?

<p>Bacterial cell wall endotoxins stimulate macrophages to overproduce IL-1 and TNF-α. (D)</p> Signup and view all the answers

What is one of the roles of cytokines in immune responses?

<p>To initiate inflammation (D)</p> Signup and view all the answers

What is a potential therapeutic strategy for treating bacterial septic shock?

<p>Using antagonists to block the effects of IL-1 and TNF-α. (B)</p> Signup and view all the answers

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