immunity for a level biology
DESCRIPTION
Guidance and diagrams to support A level Biology TachingTRANSCRIPT
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Immunity
Lesson Objectives.
1. Understand how pathogens cause disease.2. Recall phagocytosis and the role of lysosomes
in phagocytosis.3. Know what an antigen is.4. Know that there are two types of
lymphocytes.5. Know the role of T cells in cell mediated
immunity.6. Know the role of B cells in humoral immunity.
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1_3_necrosis.mov
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Lymphocytes have various immune responses
• Each lymphocyte attacks a specific antigen.
1. Killer T-lymphocytes (cytotoxic T-lymphocytes) bind to cells eg those infected by viruses and kill them by lysis.
2. Helper T-Lymphocytes stimulate B-lymphocytes to divide into antibody producing plasma cells – B-lymphocytes cant work without them.
3. Plasma B-lymphocytes secrete antibodies into the blood plasma.
4. Memory B and T-lymphocytes remain in the blood for many years and produce a more effective secondary immune response to an infection which is the basis of long term immunity.
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Immune response
• Invading pathogens stimulate an immune response phagocytes are the first line of response but the long term response is governed by antibodies.
• An immune response is a response to the presence of an antigen its purpose is to remove the antigen.
• Cells and molecules that are part of the body are described as self since the immune system has become desensitised to them.
• Antigens are therefore described as non self particles.
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1_3_necrosis.mov
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This picture shows HIV budding and bursting out of an infected cell.
Viruses are not considered to be living organisms by many biologists because they are unable to reproduce on their own.
To reproduce they must invade a host cell and use the hosts cellular mechanisms to produce new virus copies.
This budding HIV has been made by the infected cell.
hiv_life_cycle-lg.wmv
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Eosinophil - In the cell's cytoplasm (yellow) are many lysomomes (purple), used to destroy invading organisms. They are capable of ingesting and destroying foreign particles by a process known as phagocytosis.
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Phagocytosis – the formation of a phagosome
1_7_phagocytosis.mov
1_11_macrophage.mov
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Illustration of the fluid-mosaic model of the plasma membrane.
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MHCselfprotein
Lymphocyte(helper T cell)
Nucleus
Macrophage
Bacterium
Bacterial antigen
Phagocytes Are Antigen-Presenting Cells
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1 Phagocytosis ofthe microbialinvader
Macrophage Lymphocyte(helper T cell)
Phagocytes Are Antigen-Presenting Cells
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Macrophage
Antigens from thedismantled invaderare attached to MHC self proteins
2
MHC self protein Lymphocyte(helper T cell)
Phagocytes Are Antigen-Presenting Cells
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Macrophage
MHC proteins andtheir attached antigens are displayed onmacrophagesurface
3
Lymphocyte(helper T cell)
Phagocytes Are Antigen-Presenting Cells
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Lymphocyte(helper T cell)
Macrophage
MHC proteins andtheir attached antigens are displayed onmacrophagesurface
3
Phagocytes Are Antigen-Presenting Cells
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Phagocytes Are Antigen-Presenting Cells
Lymphocyte(helper T cell)
Macrophage
Helper T cells recognize antigens and MHC proteins and bind to the macrophage, initiating a series of immune events
4
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Macrophages Are Antigen-Presenting Cells
1 Phagocytosis ofthe microbialinvader
Lymphocyte(helper T cell)
Nucleus
Macrophage
Bacterium
Antigens from thedismantled invaderare attached to MHC self proteins
2
MHC proteins andtheir attached antigens are displayed onmacrophagesurface
3
Helper T cells recognize antigens and MHC proteins and bind to the macrophage, initiating a series of immune events
4
MHCselfprotein
Bacterial antigen
Cytotoxic T Cell.swf
1_12_ctl.mov
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Cell Mediated immunity.
• T-lymphocytes are involved in the cell mediated response.
• They have receptors on their surfaces which bind to antigens directly. Killer T-cells then destroy the foreign cell.
• The HIV virus destroys killer T-cells.• T-lymphocytes are associated with
immune responses in tissues rather than in the blood.
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t_cell_function.mov
T cells Dependent Antigens.swf
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Cell mediated Immunity - The T cell immune defense
Virus
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Cell Mediated immunity - The T cell immune defense
Virus
MHC protein Processedviral antigen
Macrophage
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Cell Mediated Immunity - The T cell immune defense
Virus
T cellreceptorthat fits theparticularantigen
MHC protein Processedviral antigen
Macrophage
Helper T cell
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Cell Mediated Immunity - The T cell immune defense
Virus
T cellreceptorthat fits theparticularantigen
MHC protein Processedviral antigen
Interleukin-1
Macrophage
Helper T cell
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Cell Mediated Immunity - The T cell immune defense
Virus
T cellreceptorthat fits theparticularantigen
MHC protein Processedviral antigen
Interleukin-1
Macrophage
Helper T cell
Interleukin-2
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Cell Mediated Immunity - The T cell immune defense
Virus
T cellreceptorthat fits theparticularantigen
MHC protein Processedviral antigen
Interleukin-1
Macrophage
Helper T cell
Interleukin-2
MHC protein
Antigen-presentingcell
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Cell Mediated Immunity - The T cell immune defense
Virus
T cellreceptorthat fits theparticularantigen
MHC protein Processedviral antigen
Interleukin-1
Macrophage
Helper T cell
Interleukin-2
MHC proteinViral antigen
Antigen-presentingcell
Cytotoxic T cell
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Cell Mediated Immunity - The T cell immune defense
Virus
T cellreceptorthat fits theparticularantigen
MHC protein Processedviral antigen
Interleukin-1
Macrophage
Helper T cell
Interleukin-2
MHC proteinViral antigen
Antigen-presentingcell
Cytotoxic T cell
Proliferation
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Cell Mediated Immunity - The T cell immune defense
Virus
T cellreceptorthat fits theparticularantigen
MHC protein Processedviral antigen
Interleukin-1
Macrophage
Helper T cell
Interleukin-2
MHC proteinViral antigen
Antigen-presentingcell
Cytotoxic T cell
Proliferation
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Cell Mediated Immunity - The T cell immune defense
Virus
T cellreceptorthat fits theparticularantigen
MHC protein Processedviral antigen
Interleukin-1
Macrophage
Helper T cell
Interleukin-2
MHC proteinViral antigen
Antigen-presentingcell
Cytotoxic T cell
Proliferation
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Cell Mediated Immunity - The T cell immune defense
Virus
T cellreceptorthat fits theparticularantigen
MHC protein Processedviral antigen
Interleukin-1
Macrophage
Helper T cell
Interleukin-2
MHC proteinViral antigen
Antigen-presentingcell
Cytotoxic T cell
Proliferation
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Cell Mediated Immunity - The T cell immune defense
Virus
T cellreceptorthat fits theparticularantigen
MHC protein Processedviral antigen
Interleukin-1
Macrophage
Helper T cell
Interleukin-2
MHC proteinViral antigen
Antigen-presentingcell
Cytotoxic T cell
Proliferation
Infected celldestroyed bycytotoxic T cell
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Humoural Immunity - The B cell immune defense (producing antibodies)
Invading microbe
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Invading microbe
Antigen
Humoural Immunity - The B cell immune defense (producing antibodies)
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Invading microbe
Antigen
B cell receptor(antibody)
Processedantigen
B cell
Humoural Immunity - The B cell immune defense (producing antibodies)
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Invading microbe
Antigen
B cell receptor(antibody)
Processedantigen
B cell
MHC protein
Processed antigen
Macrophage
Humoural Immunity - The B cell immune defense (producing antibodies)
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Invading microbe
Antigen
B cell receptor(antibody)
Processedantigen
B cell
Helper T cell
T cell receptorMHC protein
Processed antigen
Macrophage
Humoural Immunity - The B cell immune defense (producing antibodies)
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Invading microbe
Antigen
B cell receptor(antibody)
Processedantigen
B cell
Interleukin-1
Helper T cell
T cell receptorMHC protein
Processed antigen
Macrophage
Humoural Immunity - The B cell immune defense (producing antibodies)
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Invading microbe
Antigen
B cell receptor(antibody)
Processedantigen
B cell
Interleukin-1
Helper T cell
T cell receptorMHC protein
Processed antigen
Macrophage
B cell
Helper T cell
Humoural Immunity - The B cell immune defense (producing antibodies)
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Invading microbe
Antigen
B cell receptor(antibody)
Processedantigen
B cell
Interleukin-2
Plasma cell
Antibody
Interleukin-1
Helper T cell
T cell receptorMHC protein
Processed antigen
Macrophage
B cell
Helper T cell
Humoural Immunity - The B cell immune defense (producing antibodies)
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Invading microbe
Antigen
B cell receptor(antibody)
Processedantigen
B cell
Interleukin-2
Plasma cell
Antibody
Interleukin-1
Helper T cell
T cell receptorMHC protein
Processed antigen
Macrophage
B cell
Helper T cell
Humoural Immunity - The B cell immune defense (producing antibodies)
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Invading microbe
Antigen
B cell receptor(antibody)
Processedantigen
B cell
Interleukin-2
Plasma cell
Antibody
Plasma cell
Microbe marked for destruction
Interleukin-1
Helper T cell
T cell receptorMHC protein
Processed antigen
Macrophage
B cell
Helper T cell
Humoural Immunity - The B cell immune defense (producing antibodies)
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Invading microbe
Antigen
B cell receptor(antibody)
Processedantigen
B cell
Memory cell
Interleukin-2
Plasma cell
Antibody
Plasma cell
Microbe marked for destruction
Interleukin-1
Helper T cell
T cell receptorMHC protein
Processed antigen
Macrophage
B cell
Helper T cell
Humoural Immunity - The B cell immune defense (producing antibodies)
T cells Dependent Antigens.swf
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Bacteria Viruses
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Bacteria Viruses
Innate response
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Bacteria Viruses
Innate response Physical barriers
Mucous membranes
Cytokines
Antimicrobial secretions
Cilia
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Bacteria Viruses
Innate response Physical barriers
Mucous membranes
Cytokines
Antimicrobial secretions
Cilia
Macrophages
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Bacteria Viruses
Innate response
Acquired response
Physical barriers
Mucous membranes
Cytokines
Antimicrobial secretions
Cilia
Macrophages
Macrophagespresent antigens
T cells B cells
Cellular response Humoral response
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Bacteria Viruses
Innate response
Acquired response
Physical barriers
Mucous membranes
Cytokines
Antimicrobial secretions
Cilia
Macrophages
Macrophagespresent antigens
Cellular response
T cells B cells
Cytotoxic T cells
Humoral response
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Bacteria Viruses
Innate response
Acquired response
Physical barriers
Mucous membranes
Cytokines
Antimicrobial secretions
Cilia
Macrophages
Macrophagespresent antigens
Cellular response
T cellsCytokines
B cells
Cytotoxic T cells
Humoral response
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Bacteria Viruses
Innate response
Acquired response
Physical barriers
Mucous membranes
Cytokines
Antimicrobial secretions
Cilia
Macrophages
Macrophagespresent antigens
Cellular response Humoral response
T cellsCytokines
B cells Memory B cells
Cytotoxic T cells
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Bacteria Viruses
Innate response
Acquired response
Physical barriers
Mucous membranes
Cytokines
Antimicrobial secretions
Cilia
Macrophages
Macrophagespresent antigens
Cellular response Humoral response
T cellsCytokines
B cells Memory B cells
Cytotoxic T cells Plasma cells
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Bacteria Viruses
Innate response
Acquired response
Physical barriers
Mucous membranes
Cytokines
Antimicrobial secretions
Cilia
Macrophages
Macrophagespresent antigens
Cellular response Humoral response
T cellsCytokines
B cells Memory B cells
Cytotoxic T cells Plasma cells
Antibodies
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Bacteria Viruses
Innate response
Acquired response
Physical barriers
Mucous membranes
Cytokines
Antimicrobial secretions
Cilia
Macrophages
Macrophagespresent antigens
Cellular response Humoral response
T cellsCytokines
B cells Memory B cells
Cytotoxic T cells Plasma cells
Antibodies
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Immunoglobulin G antibody molecules, coloured transmission electron micrograph (TEM). IgG is the most abundant human immunoglobulin, and is found in all body fluids. Each Y-shaped molecule bears two arms that can bind to specific antigens, for instance bacterial or viral proteins. In doing this they mark the antigen for destruction by phagocytes, white blood cells that ingest and destroy foreign bodies. They can also kill some pathogens directly, and can neutralise toxins.
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antibody antigen interractions.swf
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Antibody Mediated immunity.
• Antibodies make antigens harmless in one of several ways.
1. Agglutination antibodies stick to the surface of the pathogen making them clump together rendering the pathogen harmless.
2. Antibodies sticking to the surface of the pathogen causes lysis (breaking up of the foreign cell)
3. Phagocytosis – by phagocytes is speeded up.4. Precipitation – soluble toxins which are
dissolved in body fluids become solid so can no longer do harm.
5. Bacteria are prevented from attaching to the hosts cell membranes.
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Humoural Immune response• When the B cells recognise a pathogen it begins
dividing rapidly into plasma cells and memory cells.
• When the pathogen has been destroyed the memory cells stay in the circulation to counteract infection if the pathogen returns.
• This gives your body an immunological memory so that your body can respond much faster when the pathogen returns – probably before symptoms appear.
• You will be naturally immune – this type of immunity where you make your own antibodies is called active immunity.
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Secondary immune response.
• Not all lymphocytes become plasma cells some become memory cells which stay dormant in the blood.
• The plasma cells die once the infection is over but the memory cells don’t.
• If a second infection occurs memory cells respond immediately by producing antibodies and dividing producing more plasma cells.
• This is the secondary immune response. They secrete more antibodies more quickly this is why the secondary immune response is greater and faster.
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Secondary immune response
Primary immune response caused by
the secretion of antibodies from
plasma B-lymphocytes
Secondary immune response caused by
the secretion of antibodies from
memory B-lymphocytes
Resulting in a greater faster immune
response before illness occurs.
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Types of immunity and vaccinationsLesson Objectives
1. Understand the difference between passive, active immunity and herd immunity.
2. What is a vaccine?3. Understand what constitutes an effective
vaccination program.4. Why does vaccination rarely eliminate a
disease?
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•Passive immunity is a temporary type of immunity.•Babies are naturally passively immune to a number of diseases when they are born because their mothers antibodies cross the placenta into their blood stream.•Babies also gain these antibodies whilst being breast fed.•They have no memory cells being formed though and after a while antibodies break down so the immunity goes.•This passive immunity allows the baby a chance for it to develop its own active immunity.
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Passive immunity• Passive immunity is a temporary type of
immunity.• Babies are naturally passively immune to a
number of diseases when they are born because their mothers antibodies cross the placenta into their blood stream.
• Babies also gain these antibodies whilst being breast fed.
• They have no memory cells being formed though and after a while antibodies break down so the immunity goes.
• This passive immunity allows the baby a chance for it to develop its own active immunity.
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Vaccines • Whilst your immune system is
manufacturing B-lymphocytes you suffer from a disease.
• Vaccination allows us to avoid this by building up B-lymphocytes and the antibodies needed to fight a disease without the microbe being present and increasing in numbers at the same time (which is what causes the disease)
• This means that we can get the immunity without getting the symptoms.
• Vaccine.swf• vaccination.mov
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Vaccines come in various types
1. Dead pathogens eg whooping cough – the pathogen is killed but the antigens remain on the surface so the body goes through the immune response without the microorganism causing disease.
2. Non-virulent strains of pathogen (attenuated vaccine) eg rubella some strains of the disease stimulate antibody production without causing the disease.
3. Modified toxins eg Diptheria. Toxins produced by the pathogens act as antigens. The toxin can be heat treated so that it does not produce the symptoms but still triggers an immune response.
4. Isolated antigens – eg influenza sometimes the antigen can be separated from the pathogen and injected to induce an immune response.
5. Genetically engineered antigens eg Hepatitis B antigens are manufactured by genetic engineering so they can be injected without the disease developing
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Artificial immunity
• Vaccines give you artificial immunity. Its active immunity because your body makes its own antibodies and will produce memory cells. To prevent the disease in the future.
• Its called artificial immunity because you have not actually caught the disease in the natural way – your body has been tricked into reacting to a harmless pathogen.
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Instant immunity
• After cuts or bites people may be injected with tetanus antibodies rather that the tetanus pathogen.
• This gives you artificial immunity instantly.
• It is however passive because your B-lymphocytes have not been involved in the production of the antibodies therefore there will be no memory bells.
• The immunity will wear off when the antibodies break down.
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Herd immunity
• Vaccines not only protect the people vaccinated but they reduce the occurrence of the disease – those not vaccinated are less likely to catch it.
• This is called the herd immunity effect.
• This is one of the factors which helped in the irradiation of the small pox virus following a WHO vaccination program.
• herd immunity animation.swf
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Monoclonal AntibodiesLesson Objectives
1. Understand how monoclonal antibodies in enabling the targeting of specific substances and cells.
2. Evaluate methodology, evidence and data relating to the use of vaccines and monoclonal antibodies
3. Discuss ethical issues associated with the use of vaccines and monoclonal Antibodies
4. Explain the role of the scientific community in validating new knowledge about vaccines and monoclonal antibodies, thus ensuring integrity
5. Discuss the ways in which society uses scientific knowledge relating to vaccines and monoclonal antibodies to inform decision-making.
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Monoclonal Antibodies.swf
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http://www.sumanasinc.com/webcontent/animations/content/ELISA.html
"hybridoma" cells being multiplied in a fermenter.
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