Serology / Immunology Review
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Function of the immune system.
- Recognise self from non-self
- Defend body against non-self
2 Divisions of the immune system
Non Specific Immunity
- Not specific against one specific disease.
- Immunity that is innate or inborn
3 Catagories of non-specific immunity
- Naturally Occuring Antibodies.
2 Types of resistance
- Passive resistance
- Active resistance
- Called external defense system.
- Includes Structural Barriers.
- First line of defense in intact skin & mucous membranes.
- Skin temp
- body secretions
- Called Internal defense system
- body responds to foreign antigen
Types of actuve resistance.
- NK Cells.
- Acute Phase reactants.
- Soluble Mediators
Acute phase reactants.
- Soluble proteins produced in the liver in response to Antigen stimulation.
- 2 most common are: C reactive proteins and complement.
C Reactive Protein (CRP)
- Globulin produced during inflammation.
- Not found in normal serum.
- Production begins within 4 hours of onset of inflammation
- disappears from serum rapidly after inflammation is gone.
- Beta globulin found in serum in active from.
- Series of 9-18 plasma proteins (complements)
- Also called soluble mediator
Function of complement
- Complement Fixation
- Plasma proteins produced in response to antigen stimulation.
- 2 catagories : complement & cytokines.
plasma proteins produced by activated cells that regulate immune responses.
What are cytokines that are produced by lymphocytes called?
Types of Cytokines
- Tumor necrosis Factor (TNF)
- Colony Stimulating Factor (CFS)
- Transforming Growth factor
- Group of 12 cytokines
- act between leukocytes
- do not bind to antigen
- Produced by virally infected cells
- proteins that interfere with viral replication
- 3 major calles are alpha beta gamma
Tumor Necrosis Factor (TNF)
- Cytokines that can destroy tumor cells.
- 2 types: alpha beta
- Can cause shock and death if they reach the blood stream.
Colony Stimulating Factor (CSF)
- Proteins that stimulate production of non-lymphoid cells.
- Some of the CSF are produced by T-lymphocytes.
Transforming Growth Factor.
- Protein product produce by virally infected cells
- 2 forms alpha and beta
- transforms neoplastic cells
- Also called aquired or adaptive immunity.
- Immunity against specific disease.
- 2 catagories: cell mediated and humoral.
Cell mediated immunity
- Involves T-Lymphocytes
- Organ/ Graft rejection
- delayed hyper sensitivity
- contact dermititis
- Involves both T-Lymphs and B-lymphs
- antibody prodection by b-lymphs
- can be actively or passively aquired
- aquired through artificial or natural means
Actively aquired humoral immunity
- Antibody production following antigen stimulation
- Antigen stimulation may be natural or artificial.
- Natural = contracting the disease
- Artificial = Vaccine
Passively Aquired Humoral Immunity
- Antibodies are not prduced in an individual.
- Individual aquires antibody through natural or artificial means.
- Antibody aquired through placnta or brest milk.
- Antibody acquired artificially in anitibody shots (injections)
- Any foreign substance that causes immune response.
- Immune response can be cell-mediated or humoral.
- Protein carrier with 3D surface structures called epitopes.
Types of Antigens
- Autoantigen (self)
- Heteroantigen (different, but related species)
- Heterophile (different, unrelated species)
- Allo or Iso antigens (same species)
- HLA (human leukocyte antigen)
HLA (human leukocyte antigen)
- On surface of all cells, not just WBCs.
- MHC ( major histocompatability complex) antigens make up HLA.
- 2nd ABO group in determining success of grafts or transplants.
- MHC antigens are genetically determined.
- Complex Chemical Structure.
- Must be considered foreign
- Degradability / Stability
- Molecular weight over 10,000
- Gamma Globulin with immune functions
- Called immunoglobulins (IG)
- Produced by transformed B-Lymphocytes in lymphoid tissue.
Functions of Antibodies
- Combine with antigens and neutralize it.
- Combine with antigen an lyze it.
- Some antibodies are complement dependant.
- 70-75% of circulating antibodies.
- 1 basic unit with 150,000 mole wt
- Crosses the placenta.
- 4 subclasses with different heavy chain composition.
- Neutralize and bind antigen.
- React at 37 C following incubation or enhancement.
- 10% of circulating antibodies are IgM.
- 5 basic units & a J chain with 900,000 mole wt.
- Does not cross the placenta.
- No subclasses.
- Agglutination antigen and are cytolytic.
- React at 22c immediatly
- 15-20% of circulating antibodies
- Exists as monomer in serum.
- Exists as dimer in body fluids.
- Both forms posses a J chain
- Mole weight of dimer is 360,000
- 2 subclasses
- Does not cross the placenta
- <1% of circulating antibodies
- Cell membrane immunoglobulin
- 160,000 mole wt
- 1 basic unit with no J chain
- No interchain S-S bonds
- Hinge region is exposed
- Does not cross the placenta
- no subclasses
- present in serum and plasma in trace amounts
- 1 basic unit with no J chain
- 180,000 mole weight
- Fc portion can bind with mast cell
- does not cross the placenta
- no known classes
- takes part in hypersensitive reactions
4 polypeptide chains in Y shape
- 2 light chains ( kappa and lambda)
- 65% of light chains are kappa
- 35% lambda
- 2 heavy chains (A,G,D,E,M)
Light and heavy chains are linked by?
non covalent S-S bonds
Hinge region composed of?
15 amino acids between CH1 and CH2 region
Variable protion are fist _____ amino acids
110-120 on NH2 end
Folding within chain disulfide bonds are?
What portion contains antibody binding sites?
What portion has ability to crystalize?
- part of Antibody structure that is the same in all humans
- Structure of antibodies that is found on some but not all antibodies.
- structure of ab that is genetically determined.
- used as genetic markers
Unique variations of the variable portions of an AB
AB Synthesis sequence.
- Macrophage phagocytizes foreign antigen.
- Breaks down AG and collects info.
- Receptor appears on Macrophage.
- Macrophage finds T helper cell w/ compatible receptor.
- T-cell combines and downloads info.
- T helper secretes lymphokines and stimulates b-cell activation
- B-cell transforms into Plasma cell
- starts AB production
Long Lag phase
7-10 days (primary)
Short lag phase
48 hours (secondary)
Factors affecting AB production
- Nutrician / diet
- Stress and Hormones
- Underlying Diseases
When does bone marrow take over lymphocyte production?
Hormone that stimulates maturation of T-Lymphs
T cells are tested for what during maturation?
2 types of t-lymphs
TH cells make up what percent of lymphocytes?
TS makes up what percent of lymphocytes
what is CD?
- Cluster of differentiations
- t cell surface markers
marker need to pass self recognition test
Class 2 MHC is on T helper cells
Class 1 MHC is on T-S cells
B-lymphs make up what percent of circulating lymphocytes?
Surface Receptors on B-lymphs are called?
Ig receptors are specific to what?
Various antigens prior to exposure.
- 5-10% of circulating lymphs
- Lack surface markers of T and B cells
- Used to be called Null Cells
- Destroys target cells directly
Primary immune disorders
- 75% affect beofre age 5
- Defects in T or B line
- DiGeorge's Syndrome
- Multiple Myeloma
Secondary Immune disorders
- Underlying disease that impares that immune system.
- Temorary or perminant
- Viral Infections
- Diabetes Mellitus
Leukocytes communicate how?
- Physical contact
- or siluble mediators (chemical substances)
AG and AB bonding creates what?
- Bond is non-covalent and reversible
Types of Bonds AB-AG reactions
- Van Der Waals forces.
Ability of an AB to combine with one specific AG
Bond that forms between AB and AG
Strength of bond between AG - AB
- AB can combine with AG tht has similar epitopes.
- Heterophile antibodies
- Uses isotope lable
- Competative binding
- Labled AB vs. unlabled AB competeing with binding with known antigen
Enzyme Immunoassay (EIA)
- Enzyme labeled antibody conjugate (AHG)
- competative binding (sandwich principle)
- Enzyme causes a color change
Common Colloidal particls used with Sol particle Immunoassay.
Gold, Silver, Iodine, barium, sulfate
Light scatter of macro immune complexes
- stained cell passes single file through laser
- cell flourecents a distinctive color of light
- <5000 daltons
- can combine with protein to become Antigen
How many classes does MHC have?
final visible result of a soluble Antigen to it's antiserum?
Plasma cell that makes one specific AB
enzyme found in tears and other secretions
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