Immunological Tolerance and Autoimmunity Lecture Notes
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Questions and Answers

What are the two main types of autoimmune diseases mentioned in the text?

  • Organ specific and non-organ specific (correct)
  • Systemic and localized
  • Rheumatoid arthritis and Grave's disease
  • Genetic and environmental

Which genetic factor is associated with rheumatoid arthritis according to the text?

  • Superantigen production
  • HLA-DRB1 (correct)
  • Molecular mimicry
  • Vascular or cellular barriers

Which host factor makes some autoimmune diseases more common in females?

  • Gender (correct)
  • Alteration of self molecules
  • Infection disrupting peripheral tolerance
  • Damage to immunologically privileged sites

Which environmental factor can alter self molecules to become immunogenic?

<p>Drugs, radiation, or chemicals (C)</p> Signup and view all the answers

Which mechanism is a theoretical possibility where foreign and self-peptides have sequence similarities, leading to cross-activation of autoreactive cells?

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

What is the definition of an autoantibody according to the text?

<p>An antibody produced by the immune system that is directed against one or more of the individual's own proteins (A)</p> Signup and view all the answers

Where does central T cell tolerance occur?

<p>In the fetal thymus (C)</p> Signup and view all the answers

What happens to T cells that fail to recognize and bind to self-MHC molecules during central tolerance?

<p>They undergo apoptosis (non-selection) (B)</p> Signup and view all the answers

Which mechanism is involved in peripheral T cell tolerance for autoreactive T cells that escape central tolerance?

<p>Suppression by regulatory T cells producing inhibitory cytokines (A)</p> Signup and view all the answers

Which mechanism is involved in central B cell tolerance?

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

What is the primary mechanism of peripheral B cell tolerance?

<p>Clonal anergy due to lack of T cell help (C)</p> Signup and view all the answers

What characterizes an autoimmune disease?

<p>An abnormal immune response against self-substances and tissues (B)</p> Signup and view all the answers

What is immunological tolerance?

<p>A state of unresponsiveness of the immune system to substances or tissues that have the capacity to elicit an immune response (D)</p> Signup and view all the answers

Where does central tolerance occur?

<p>In the bone marrow and thymus (C)</p> Signup and view all the answers

What is the primary role of T cell tolerance?

<p>To prevent immune responses against self-antigens (D)</p> Signup and view all the answers

Why is it necessary for the immune system to discriminate between self and non-self?

<p>To prevent autoimmune diseases (B)</p> Signup and view all the answers

What is the difference between central and peripheral tolerance?

<p>Central tolerance occurs in the thymus and bone marrow, while peripheral tolerance occurs in other tissues and lymph nodes (A)</p> Signup and view all the answers

Why do developing lymphocytes express a large number of antigen receptors without bias towards specificity?

<p>To ensure a diverse repertoire of receptors capable of recognizing a wide range of antigens (A)</p> Signup and view all the answers

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