Inflammation and Repair V

5 important questions on Inflammation and Repair V

What is autoimmune disease?

Disease caused by an immune response against self antigens, can be antibody mediated and cell mediated

How is autoimmune disease induced?

From breakdown of self tolerance and failure to regulate the differing responses to self vs non self

What are the mechanisms of tissue damage in autoimmune diseases?

Complement activation / opsonization
  1. Immune complex disease: persistent production of antibodies against self antigens (e.g. Polyarthritis, vasculitis, uveitis, glomerulonephritis)
  2. Antibody mediated cytotoxicity: antibodies against self antigens on cell surface (e.g. Hemolytic anemia, thrombocytopenia, myasthenia gravis, pemphigus)


Inflammation / cell killing
  1. T cell mediated cytotoxicity: Cytotoxic T cells against self cells (e.g. Myositis, discoid lupus, hypothyroidism, hypoadrenocorticism)
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What is the timing of the responses to injury?

  1. Serous or fibrinous exudate: 0-4 days, peak at 2 days
  2. Leukocyte infiltration: 0-12+ days, peak at 4-6 days
  3. 1st immune response: 5 days to weeks or months, peaking at 2+ weeks
  4. Repair: 6 days to weeks or months, peaking at 2+ weeks

What do various cells deal with during inflammation?

- Neutrophils: extracellular bacteria
- Eosinophils: metazoan parasites e.g. Worms
- Macrophages: fungi, mycobacteria, foreign material
- Cytotoxic T cells: viruses, protozoa
- Humoral responses: edema, fibrinogen, complement, antibody, innate defense proteins

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