Chapter 16/17: Immune system
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1 Chapter 16/17: Immune system Lecture Chapter 16: Nonspecific defenses First line of defense Formed elements Second line of defense Complement system Chapter 17: Specific defenses Antibodies Humoral response Cellular response Lab Check results from Tues and inoculate glucose and lactose broths for Enteric A and B Lab EXAM
2 Immunity terminology Susceptibility- Lack of resistance to a disease Resistance/ immunity- Ability to ward off disease Innate (nonspecific) immunity- Resistance to all microbes; present from birth (can be species specific) Adaptive (specific) resistance- Resistance to a specific pathogen
3 Host defense systems Figure Overview (1 of 3)
4 First lines of defense (Table 16.3) Figure 16.3 Figure 16.2 Figure 16.4 (2 of 3)
5 First line of defense- skin -Physical factors * Dermis and epidermis * Lots of keratin * Dry conditions, low temperature
6 First line of defense- skin -Physical factors * Dermis and epidermis * Lots of keratin * Dry conditions, low temperature -Chemical factors * Sebum (includes fungistatic and bacteriostatic fatty acids) * Low ph * High salt * Lysozymes (sweat) * IgA (sweat)
7 First line of defense- skin -Physical factors * Dermis and epidermis * Lots of keratin * Dry conditions, low temperature -Chemical factors * Sebum (includes fungistatic and bacteriostatic fatty acids) * Low ph * High salt * Lysozymes (sweat) * IgA (sweat) - Normal microbiota
8 First line of defense- mucosal surfaces Trapped particles in mucus Cilia -Physical factors * Mucous production * Cilia * Hairs Goblet cells Ciliated cells Computer-enhanced
9 First line of defense- mucosal surfaces Trapped particles in mucus Cilia Goblet cells Ciliated cells -Physical factors * Mucous production * Cilia * Hairs -Chemical factors * Lysozymes * Lactoferrin * a and b Defensin * IgA Computer-enhanced
10 First line of defense- mucosal surfaces Trapped particles in mucus Cilia Goblet cells Ciliated cells -Physical factors * Mucous production * Cilia * Hairs -Chemical factors * Lysozymes * Lactoferrin * a and b Defensin * IgA Computer-enhanced - Normal microbiota
11 First line of defense- lacrimal apparatus -Physical factors * Tears -Chemical factors * Lysozyme * b Defensin * IgA
12 Second line of defense: Formed Elements in Blood
13 SEM of formed elements Bruce Wetzel (photographer). Harry Schaefer (photographer) National Cancer Institute
14 Complete blood count (CBC) Type of cell Increase Decrease RBC Erythrocytosis Polycythemia Anemia WBCs Leukocytosis Leukopenia - lymphocytes Lymphocytosis Lymphocytopenia - granulocytes Granylocytosis Granulocytopenia - neutrophils Neutrophilia Neutropenia - eosinophils Eosinophilia Eosinopenia Platelets Thrombocytosis Thrombocytopenia ALL cell lines Pancytopenia
15 Self-study for Thursday - Preview the following processes: - Phagocytosis - Fever - Inflammation - Complement proteins
16 Second line of defense: Phagocytosis Figure Overview Figure 16.6
17 Microbial evasion of phagocytosis Inhibit adherence: M protein, capsules Kill phagocytes: Leukocidins Lyse phagocytes: Membrane attack complex Escape phagosome Prevent phagosome-lysosome fusion Survive in phagolysosome Streptococcus pyogenes, S. pneumoniae Staphylococcus aureus Listeria monocytogenes Shigella HIV Coxiella burnetti and Mycobacteria spp
18 Second line of defense: Fever -Usually set at 37 C -Some chemical signals set it higher -Cytokine interleukin-1 -Cytokine alpha-tumor necrosis factor -Prostoglandins reset hypothalamic thermostat
19 Second line of defense: Inflammation 1. Chemicals released 1. Histamine 2. Kinins 3. Prostaglandins 4. Leukotrienes 2. Vasodilation 3. Increased permeability 4. Activation of acute phase proteins (5. Clot formation, abscess, tissue repair)
20 Inflammationchemical signals Histamine Kinins Prostaglandins Leukotrienes Vasodilation, increased permeability of blood vessels Vasodilation, increased permeability of blood vessels Intensity histamine and kinin effect Increased permeability of blood vessels, phagocytic attachment
21 Inflammation MORE DETAIL: Vasodilation/ increased Permeability - Margination WBCs - Emigration WBCs Activation of acutephase proteins - Cytokines - Kinins - Complement proteins - (Interferons)
22 Complement system
23 Independent Study - Review the following processes: - Phagocytosis - Fever - Inflammation - Complement proteins
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