Immune Surveillance. Immune Surveillance. Immune Surveillance. Neutrophil granulocytes Macrophages. M-cells
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1 he immune system is everywhere Some organs have developed strategies towards the immune system to keep it out or to put it under control Immune privileged organs: Brain Eye estis hyroid gland Humoral immunity Soluble factors Complement system Cytokines/Chemokines Antibodies ular immunity Immune cells Innate immunity Granulocytes Macrophages Mast cells NK-cells M-cells Follicular DC Adoptive immunity B-lymphocytes Neutrophil granulocytes Macrophages ake up Bacteria Virus Dead cells Destroy them in lysosomes Eosinophilic and basophilic Granulocytes Mast cells NK-cells Deliver substances from storage granules Kill parasites or tumour cells Induce or support inflammatory response M-cells ransport antigens from lumen to lamina propria ake up antigens from their environment Process antigens in the lysosomal compartment Present antigens on MHC surface molecules to Follicular dendritic cells Present antigen to B-lymphocytes 1
2 B-lymphocytes Humoral immune response = production of antibodies Pre-B cell (development): Bone marrow B-cell priming and differentiation: Lymph follicle Plasma cells: antibody production in lymphatic or other tissues Memory B-cells: react faster to same antigen Function of Antibodies Bind to antigenic molecules Neutralize toxins Subclasses of antibodies (immunoglobulins) IgA Added to secretion of glands ears Nasal cavity Bronchial surface Gastrointestinal surface IgG and IgM Delivered to blood and extracellular liquid ular immune response Cytotoxic -cells (CD8+) Kill virus infected cells Kill tumour cells -Helper cells (+) Produce cytokines = hormone-like soluble factors Support B-cell differentiation Support cytotoxic -cell function Normal conditions In most tissues immune cells in low numbers Danger rauma/surgery Infection umour Danger signals Factors released by damaged cells Heat shock protein 70 <> oll-like receptor 4 Molecules derived from micro-organisms Lipopolysaccharides <> oll-like receptor 4 oxic molecules from the environment Solvents <> plastic dye Solvent Orange 60 Effects of danger signals Release of factors by immune and other cells Chemokines, Cytokines Endothelial cell leakage Immigration of immune cells into the tissue Granulocytes, Macrophages, NK-cells Emigration of immune cells out of the tissue 2
3 Example of danger Flu virus infection Immune response in lymph node -Lymphocyte Interaction Antigen MHC I Activation of -Lymphocytes 2. Proliferation of -Lymphocytes 3. Armament of Killer s 4. Production of Cytokines 3
4 IL-12 IL-12 IFN- 2. Proliferation of -Lymphocytes 3. Armament of Killer s 4. Production of Cytokines Interferon-gamma Collateral Damage Killing of infected cells Epithelial cell <> Reversible tissue damage = Regeneration Nerve cells, Muscle cells, Kidney cells <> Irreversible damage = Remaining defect + -Lymphocytes <> Interference with immune response = Immune Deficiency Harm of non-infected cells and tissues Lung <> hickening of air-blood barrier Decreasing gas exchange <> Asphyxy Endothelial cells/capillaries <> Obstruction of blood flow Decreasing blood flow <> Ischaemia, Stroke 4
5 Acquired humoral immunity Production of specific antibodies against viruses <> Capturing of viruses before they enter the body Blocking of viral binding proteins Enhancement of phagocytosis and destruction of viruses <> Prevention of collateral damage 5
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