Cytokines
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Questions and Answers

Which of the following is NOT a property of cytokines?

  • Cytokine action may be local or systemic
  • Cytokines often influence the synthesis and actions of other cytokines
  • Cytokines have a single effect (correct)
  • Cytokine secretion is a brief, self-limited event

True or False: Cytokines are high molecular proteins.

  • False (correct)
  • True

Which of the following is NOT a characteristic of cytokines?

  • They may stimulate the activity of target cells
  • They may inhibit the activity of target cells
  • They may inhibit proliferation in target cells (correct)
  • They may induce differentiation in target cells

Which of the following is a characteristic of cytokines?

<p>They bind to specific membrane receptors on target cells (D)</p> Signup and view all the answers

What type of cells secrete cytokines?

<p>White blood cells (A)</p> Signup and view all the answers

Which of the following best describes the pleiotropic nature of cytokines?

<p>Cytokines have multiple effects on target cells (C)</p> Signup and view all the answers

Which of the following statements is true regarding the diversity of cytokines?

<p>Cytokines exhibit great structural and functional diversity (C)</p> Signup and view all the answers

What is the cellular response to most cytokines?

<p>Changes in gene expression in target cells (C)</p> Signup and view all the answers

What regulates the responsiveness of cells to cytokines?

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

Which type of cells primarily produce cytokines in response to specific recognition of foreign antigens?

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

Which cytokine is produced by mononuclear phagocytes in response to infectious agents?

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

Which category of cytokines is mainly produced by mononuclear phagocytes in response to infectious agents?

<p>Mediators and Regulators of Innate Immunity (A)</p> Signup and view all the answers

Which cells primarily produce cytokines in the category of Stimulators of Haematopoiesis?

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

Which cytokines are included in the category of Mediators and Regulators of Innate Immunity?

<p>TNFα, IL12, Type 1 Interferons (B)</p> Signup and view all the answers

Which cytokine is responsible for improving the access of effector cells at the site of infection?

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

Which cytokine is responsible for increasing vascular permeability and activating NK cells?

<p>TNF-a (B)</p> Signup and view all the answers

Which cytokine is responsible for recruiting leukocytes?

<p>CXCL-8 (B)</p> Signup and view all the answers

Which cytokine is associated with lymphocyte activation and can contribute to the development of fever?

<p>IL-6 (D)</p> Signup and view all the answers

Which cytokine is responsible for the activation of Macrophages?

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

Which cytokine is responsible for the activation, growth, and differentiation of T cells, B cells, and NK cells?

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

Which cytokine is responsible for the differentiation of naive T Helper T cells to T helper 2 (TH2) Cells, and differentiation of B cells into plasma cells?

<p>Interleukin 4 (D)</p> Signup and view all the answers

Which cytokine stimulates Haematopoietic stem cells to produce granulocytes and monocytes?

<p>Granulocyte Macrophage Colony Stimulating Factor (C)</p> Signup and view all the answers

Which cytokine binds to the IFNGR and upregulates antigen presentation and lysosomal activity in Macrophages?

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

Which cells primarily produce Interferon ɤ?

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

Which receptor does Interleukin 2 bind to?

<p>IL2R (B)</p> Signup and view all the answers

Which cytokine stimulates B cell growth and increases antibody secretion?

<p>IL5 (B)</p> Signup and view all the answers

Which cytokine prevents apoptosis of lymphocytes?

<p>IL9 (B)</p> Signup and view all the answers

Which cytokine is the central regulator of IgE synthesis, goblet cell hyperplasia, mucus hypersecretion, and airway hyper-responsiveness?

<p>IL13 (C)</p> Signup and view all the answers

Which type of interferons protect neighboring cells from viral infection and increase the expression of MHC molecules on the surface of neighboring cells?

<p>Type I interferons (B)</p> Signup and view all the answers

Which type of interferons activate Natural Killer Cells?

<p>Type I interferons (B)</p> Signup and view all the answers

Which cells can produce Type I interferons in response to viral infection?

<p>All cells of the body (C)</p> Signup and view all the answers

Which of the following is NOT the role of Type I interferons?

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

Which of the following conditions CANNOT be treated with Type I interferons?

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

What is the role of Interleukin 8 (IL8 or CXCL8)?

<p>Enhancing inflammation and enabling immune cell migration (A)</p> Signup and view all the answers

Which receptors do Interleukin 8 (IL8) bind to?

<p>CXCR1 and CXCR2 (B)</p> Signup and view all the answers

Which cells primarily produce Interleukin 8 (IL8)?

<p>Macrophages and Endothelial Cells (A)</p> Signup and view all the answers

What is the main function of chemokines?

<p>To induce directed chemotaxis in nearby responsive cells (D)</p> Signup and view all the answers

How do chemokines exert their effects on target cells?

<p>By interacting with transmembrane receptors (B)</p> Signup and view all the answers

How does the chemotactic response occur in the presence of a chemokine gradient?

<p>Target cells move along the chemokine concentration gradient (C)</p> Signup and view all the answers

Which of the following is NOT a function of chemokines?

<p>Suppression of the inflammatory reaction (B)</p> Signup and view all the answers

What is the function of chemokines in guiding leukocytes to sites of infection or tissue damage?

<p>Serving as chemoattractants (C)</p> Signup and view all the answers

Which cells display high concentrations of chemokines on their surface?

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

Which of the following is a function of homeostatic chemokines?

<p>Organizing various cell types in different anatomic regions of the tissues (A)</p> Signup and view all the answers

What is the term used for chemokines produced constitutively by stromal cells in tissues?

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

What are the two main functions of chemokines?

<p>Acute inflammation and maintenance of tissue architecture (C)</p> Signup and view all the answers

What induces the production of chemokines?

<p>Microbes and other stimuli (A)</p> Signup and view all the answers

Which of the following is NOT a function of chemokines?

<p>Inhibition of inflammation (D)</p> Signup and view all the answers

Which chemokine is constitutively expressed in the thymus and specifically binds to T cells?

<p>CCL17 (C)</p> Signup and view all the answers

Which chemokine selectively recruits eosinophils and is implicated in allergic disease?

<p>CCL11 (A)</p> Signup and view all the answers

Which chemokine is important in recruiting white blood cells to sites of inflammation, including T cells, eosinophils, and basophils?

<p>CCL5 (D)</p> Signup and view all the answers

Which cytokines are released during the acute phase response and lead to systemic responses, including fever?

<p>TNFα and IL-1β (A)</p> Signup and view all the answers

Which of the following does NOT triggers the acute phase response?

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

Which of the following acute phase proteins is responsible for trapping invading microbes in blood clots?

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

Which of the following acute phase proteins binds to exposed mannose on microorganisms, facilitating opsonization and complement activation?

<p>Mannose Binding Protein (MBP) (D)</p> Signup and view all the answers

Which acute phase protein is responsible for preventing iron uptake by bacteria?

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

Which acute phase protein downregulates inflammation and prevents tissue damage?

<p>Alpha 1 - antitrypsin (C)</p> Signup and view all the answers

Which acute phase protein binds phosphoryl choline on microorganisms and plays a role in opsonization, complement activation, and phagocytosis?

<p>C Reactive Protein (CRP) (B)</p> Signup and view all the answers

Which of the following is the physiological role of decreased synthesis of negative acute phase proteins?

<p>To save amino acids for producing positive acute phase proteins (D)</p> Signup and view all the answers

What is the clinical significance of measuring acute phase proteins (APP), particularly C-reactive protein (CRP)?

<p>They reflect the presence and severity of an inflammatory response. (C)</p> Signup and view all the answers

Which of the following is an example of a negative acute phase protein?

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

Which of the following is NOT an example of a positive acute phase protein?

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

What is the main purpose of serial measurements of acute phase proteins in the case of infection?

<p>To assess response to treatment (B)</p> Signup and view all the answers

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