Skin and Immune Mediated Disease 2

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Anonymous
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292324
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Skin and Immune Mediated Disease 2
Updated:
2015-01-02 09:53:58
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Skin Immune Disease
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Vet Med - Module 7
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  1. List the three physical and chemical barriers of the skin
    • Stratum corneum
    • Cutaneous lipids
    • Antimicrobial peptides
  2. What is the skin microbiome?
    The commensal bacteria in the skin
  3. How does the skin micro biome contribute to innate skin immunity?
    It has an anti-inflammatory role and affects T cell maturation
  4. Describe the structure of the stratum corneum
    The stratum corneum consists of lipid bilayers mixed with proteins
  5. What type of lipids are present in the stratum corneum?
    Sphingolipids, free fatty acids and cholesterol
  6. How do commensal microbes in the skin activate T cells?
    They stimulate the skin and immune cells to produce IL-1 which activates T cells
  7. What do keratinocytes produce?
    Chemokines and cytokines
  8. What is the role of chemokines and cytokines?
    • Chemokines - critical in T cell and macrophage recruitment
    • Cytokines - arm effector cells and direct the immune response
  9. What is the main role of dendritic cells?
    Antigen presentation
  10. What type of dendritic cells are found in the skin?
    Langerhans cells
  11. What do mast cells release?
    Histamine
  12. What is the collective term for keratinocytes, dendritic cells, mast cells and lymphocytes in the skin?
    Sentinel cells
  13. What are the three major roles of keratinocytes with regards to immunity?
    • A sentinel cell active in host defence
    • A pro-inflammatory effects cell
    • A non-professional antigen-presenting cell
  14. Describe the difference between the innate and adaptive skin immune response
    • Innate: injury/pathogen invasion - release of primary cytokines - activation of skin cells and resident innate immune cells - Langerhans cells and dermal dendritic cells carry antigen to draining lymph node - T cells activated - more innate cells recruited
    • Adaptive: pathogen / injury with recognised antigen - cytokines and chemokines released by activated Langerhans cells, fibroblasts and keratinocytes - Non-specific recruitment of CLA and effector T cells - Antigen specific T cells proliferate and destroy OR T cells no cognate antigen and it gets into general circulation via lymphatics
  15. What type of immune cells link the innate and adaptive immune responses?
    Dendritic cells
  16. What are the primary, secondary and tertiary skin immune surveillance responses?
    • 1 - innate immune system tries to trigger adaptive immune response (innate immune system ensures effective engagement of adaptive immune response)
    • 2 - T cells destroy antigens they are already primed to destroy (rapid and effective local immune response to previously encountered antigens)
    • 3 - If immune system finds the same antigen but in a different location it kills it anyway (enhanced adaptive response to antigens encountered in different tissues)
  17. What is erythema with regards to the skin?
    Redness
  18. Define the following terms for epidermal response to injury a) Orthokeratotic hyperkeratosis (orthokeratosis) b) Parakeratotic hyperkeratosis (parakeratosis) c) Hypergranulosis d) Acanothosis e) Hyperplasia f) Hyper/hypopigmentation g) Lichenification
    • a) Increased thickness of anuclear surface keratin
    • b) Prominent granular layer often associated with orthokeratotic hyperkeratosis
    • c) Thickened keratin layer that has retained nuclei
    • d) Broadening of the spinous layer - often accompanies hyperplasia
    • e) An increase in the number of epidermal cells, often irregular
    • f) Increased/decreased pigmentation
    • g) Hyperkeratosis, hyperplasia and dysplacia
  19. What is a cutaneous callus?
    Localised areas of thickening/lichenification
  20. Where do cutaneous calluses usually develop?
    Over pressure points e.g. elbow, hocks, sternum
  21. Give examples of causes of direct/indirect traumatic skin disease
    • Direct - Friction/pressure, chemical, heat, light
    • Indirect - metabolic
  22. What is a major role in the development and progression of skin disease in animals?
    Self trauma
  23. Which reflex often occurs in response to pruritus (or pain)?
    Scratch reflex
  24. True or false: the scratch reflex is a spinal reflex?
    True, it is a spinal reflex modulated by motor cortex neurones
  25. Describe the itch/scratch cycle
    An allergen/irritant causes release of inflammatory chemicals which causes itchy, red dry skin.  This causes the animal to scratch which can allow bacteria to enter the wound and further add to the skin problems and cause release of more inflammatory chemicals, and so the cycle continues.
  26. What is acral lick dermatitis?
    Hairless plaques caused by either underlying pyoderma and/or behavioural disturbances

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