Mycobacterium Tuberculosis Phagocytosis Process
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Questions and Answers

What is the primary cause of Chronic Granulomatous Disease (CGD)?

  • Mutations in the NADPH oxidase enzyme (correct)
  • Neutrophilia
  • Recurrent bacterial and fungal infections
  • Inability to produce toxic molecules

What is the purpose of the Nitro Blue Tetrazolium (NBT) test in diagnosing Chronic Granulomatous Disease (CGD)?

  • To measure the level of neutrophils in the blood
  • To detect the presence of granulomas in the body
  • To determine if the patient's cells can undergo an oxidative burst (correct)
  • To assess the patient's body temperature in response to infection

Which of the following is a key characteristic of the Acute-Phase Response?

  • Decreased body temperature in response to infection
  • Decreased fat metabolic rate and increased appetite
  • Increased production of C3, C4, and CRP by the liver (correct)
  • Decreased production of prostaglandins in the hypothalamus

What is the primary effect of tumor necrosis factor (TNF) during the Acute-Phase Response?

<p>Increased fat metabolic rate and anorexia (D)</p> Signup and view all the answers

Which of the following is a characteristic of the neutrophil dysfunction in Chronic Granulomatous Disease (CGD)?

<p>Inability to produce toxic molecules to kill pathogens (A)</p> Signup and view all the answers

Which cytokine is responsible for activating macrophages to kill intracellular bacteria like Mycobacterium tuberculosis?

<p>IFN-γ (C)</p> Signup and view all the answers

What is the primary function of type 1 interferons (IFN α and IFN β)?

<p>Inhibiting viral replication (A)</p> Signup and view all the answers

Which cytokine is most important in allergic diseases and activates TH2 cells?

<p>IL-4 (A)</p> Signup and view all the answers

Which protein acts as an opsonin during an acute phase response?

<p>C-reactive protein (CRP) (C)</p> Signup and view all the answers

What effect do corticosteroids have on shedding of the stratum corneum during infections like fungi?

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

Which cytokine supports the proliferation of lymphocytes in primary lymphoid tissue?

<p>IL-7 (C)</p> Signup and view all the answers

What is the function of Defensins in the immune response?

<p>Create holes in bacteria (A)</p> Signup and view all the answers

Which enzyme is responsible for producing hypochlorous acid (HOCl) in the respiratory burst process?

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

What is the role of Lactoferrin in the immune response?

<p>Bind to iron (B)</p> Signup and view all the answers

Which substance is released into the phagosome to aid in the digestion of bacteria?

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

What is the main function of Nitric Oxide in the immune system?

<p>Acts as a neurotransmitter (C)</p> Signup and view all the answers

What is the purpose of Neutrophil Extracellular Traps (NETs) in the immune response?

<p>Physically capture pathogens using DNA and histones (D)</p> Signup and view all the answers

What is the consequence of exaggerated innate immune system activation, as mentioned in the text?

<p>Systemic inflammatory response syndrome (C)</p> Signup and view all the answers

Which protein binds to endotoxin and prevents it from activating macrophages?

<p>Recombinant bacteriocidal/permeability-increasing protein (BPI) (A)</p> Signup and view all the answers

Which type of drug is Imiquimod, as mentioned in the text?

<p>Drug that mimics single-stranded RNA (D)</p> Signup and view all the answers

What is the main effect of corticosteroids at the usual doses?

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

What is the function of CpG motifs, as mentioned in the text?

<p>Stimulate dendritic cells to secrete IL-12 (A)</p> Signup and view all the answers

What effect does blocking TNF with monoclonal antibodies have on immune response?

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

What are the surface markers found on NK cells?

<p>CD16, CD56, CD2 (A)</p> Signup and view all the answers

What are the main mechanisms used by NK cells to kill target cells?

<p>Antibody-dependent cellular cytotoxicity and secretion of cytotoxic granules (D)</p> Signup and view all the answers

Which of the following is NOT an activator of NK cells?

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

How do herpesviruses and influenza viruses evade the immune response by NK cells?

<p>Herpesviruses downregulate MHC expression, while influenza viruses upregulate MHC expression (C)</p> Signup and view all the answers

What is the main function of mast cells in the immune system?

<p>Secretion of histamine and other inflammatory mediators (C)</p> Signup and view all the answers

Which of the following is the most important chemokine for the recruitment of eosinophils to sites of inflammation?

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

What is the primary function of TH1 cells in the formation of granulomas?

<p>Secreting cytokines that promote macrophage differentiation (A)</p> Signup and view all the answers

What is the most common cause of secondary phagocyte defects?

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

What is the primary mechanism by which bacterial lipopolysaccharide (LPS) leads to septic shock?

<p>Stimulation of macrophages to produce TNF, prostaglandins, and nitric oxide (A)</p> Signup and view all the answers

What is the primary function of the BCG vaccine in the treatment of urinary bladder cancer?

<p>Stimulating a T cell-mediated immune response against bladder cancer cells (C)</p> Signup and view all the answers

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