Term
4 characteristic signs of inflammation |
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Definition
- erythema - due to increased blood flow
- heat - due to increase in blood and more rapid metabolic processes
- edema - increased permeability, fluid moves from blood to tissue spaces
- pain - injury to nerve fibers or bacterial toxins
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Term
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Definition
Increase Vasodilation
Increase Permeability
Released by mast cells in connective tissue - basophils in the blood |
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Term
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Definition
Intensify the effects of histamine
Released by injured tissue |
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Term
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Definition
Increase Permeability
Released by mast cells and basophils
Function in adherence of phagocytes to pathogens |
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Term
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Definition
- Released by monocytes, macrophages, lymphocytes
- Regulators of inflammatory response
- Attract leukocytes, initiate fever
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Term
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Definition
- Increase Vasodilation
- Increase Permeability
- Stimulates histamine release
- Attract neutrophils
- Promotes phagocytosis
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Term
Examples and Function of Polymorphonuclear Cells |
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Definition
Basophils, neutrophils, eosinophils, mast cells
Destroy intracellular pathogens (phagocytosis), release chemicals |
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Term
Examples and Function of Antigen Presenting Cells |
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Definition
Macrophages, monocytes, dendritic cells
Present antigens to lymphocytes |
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Term
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Definition
Short lived Ingest, kill, and digest microbial pathogens First to inflammatory sites Granules contain antimicrobial agents, such as:
- lysozymes
- lactoferrin
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Term
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Definition
Mediate allergic reactions and defense against helminths |
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Term
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Definition
Mast cells are tissue counterpart
Produce cytokines in defense against parasites
Responsible for allergic reaction
Secrete primary mediators (histamines) and secondary mediators (leukotrienes) |
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Term
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Definition
Macrophages are tissue counterpart
Phagocytosis and intracellular killing
Antigen presentation to T-cells
Recruit other immune cells through cytokine and production
Specialized Macrophages:
- Kupfer cells (liver)
- Glial cells (brain)
- Langerhans cells (skin)
- Osteoclasts
- Alveolar macrophages
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Term
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Definition
these are differentiated macrophages that act as APCs to active T-helper cells, Cytotoxic T cells, B-cells
Found in most organs |
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Term
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Definition
Differentiate into plasma cells to secrete immunoglobulin glycoproteins that bind antigens with high degree of specificity
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Term
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Definition
immature thymocytes differentiate in the thymus
cell mediated immunity
help B-cells produces immunoglobulins
CD4 expressing T helper cells
CD8 expressing Cytotoxic T cells |
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Term
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Definition
- T-Helper Cells
- Regulators of delayed-type hypersensitivity responses
- Assist in the stimulation of B cells
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Term
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Definition
Cytotoxic T cells
Cytotoxic against tumor cells and host cells with intracellular pathogens |
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Term
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Definition
Large, granular lymphocytes
Kill tumor cells and pathogen-infected cells
Enhanced by IFN and IL
Lack the major B and T-cell markers
Kill by direct and antibody-dependent cytotoxicity |
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Term
Primary or Secondary Lymphoid Organ? Fetal Liver |
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Definition
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Term
Primary or Secondary Lymphoid Organ? Adult bone marrow |
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Definition
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Term
Primary or Secondary Lymphoid Organ? Thymus |
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Definition
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Term
Primary or Secondary Lymphoid Organ? Lymph Nodes |
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Definition
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Term
Primary or Secondary Lymphoid Organ? Spleen |
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Definition
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Term
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Definition
- Has vascular sinuses with macrophages
- Macrophages break down old RBCs and recycles hemoglobin - retrieval of iron
- Macrophages also break down platelets
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Term
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Definition
- T and B cell area
- Germinal centers w/ macrophages and dendritic cells --> present antigens to lymphocytes
- B-cells become plasma cells so they can make immunoglobulins
- Macrophages break down antigens
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Term
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Definition
Filters antigen and debri from lymph
Macrophages and dendritic cells (primarily in medulla area) cleanse lymph
T cell and B cell maturation occurs here
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Term
Primary or Secondary Lymphoid Organ? Mucosa Associated Lymphoid Tissue |
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Definition
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Term
Musoca Associated Lymphoid Tissue (MALT): Examples |
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Definition
Tonsils
Peyer's Patches (located in ileum)
Appendix |
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Term
Musoca Associated Lymphoid Tissue (MALT): general locations and functions |
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Definition
- These are cellular aggregates (non-encapsulated) in the lining of the respiratory and digestive tracts
- They are strategically located to recognize antigens and respond with an appropriate immune response
- Contain resident intraepithelial lymphocytes
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Term
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Definition
- This is a form of SCID (Severe Combined Immunodeficiency)
- An autosomal recessive disorder
- Absence of germinal centers in lymph nodes --> replaced with a diffuse infiltrate of large cells with abundant cytoplasm
- There is abnormal intra-thymic T-cell development plus inefficient and/or abnormal generation of TCR's as well as a deficiency of B-cells and receptors (antibodies)
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Term
Omenn's Syndrome: Symptoms |
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Definition
Chronic diarrhea
leukocytosis |
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Term
T-Helper Cells: Characteristics |
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Definition
- Express the CD4 co-receptor
- Recognize antigens complexed with MHC II on B cells, macrophages, or other APCs
- Activate memory T helper cells and cytokine-secreting cells
- Stimulated B-cells
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Term
Cytotoxic T cells: Characteristics |
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Definition
- Express the CD8 co-receptor
- Dependent upon MHC I on APCs
- Are cytotoxic against tumor cells
- Are cytotoxic against host cells with intracellular pathogens --> causes them to undergo apoptosis
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Term
What are the 3 groups of molecules that specifically recognize foreign antigens for the adaptive immune system? |
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Definition
- T-cell receptors
- B-cell receptors
- MHC
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Term
T/F: Not all TCR's expressed by a single T-cell are specific for the same antigen |
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Definition
False
ALL TCR's expressed by a SINGLE T-CELL ARE SPECIFIC for the SAME ANTIGEN |
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Term
Endogenous (cytoplasmic) Antigen Processing: Characteristics |
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Definition
MHC I are associated with this type of antigen processing
MHC I are found in all nucleated cells (excluding immunological cells)
MHC I participates in anitgen presentation to CD8 Cytotoxic T cells
Endogenous because the virus has already infected the cell and has started to make viral proteins that are in the cytoplasm (endogenous pathogens)
The viral protein is degraded by proteosomes and the degradation products of the viral protein are combined with MHC I --> sent to cell surface for presentation
This marks the cell for destruction by Cytotoxic T cells
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Term
Exogenous (endosomal) Antigen Processing: Characteristics |
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Definition
- MHC II are associated with this type of antigen processing
- MHC II molecules are found on APC's (macrophages, dendritic cells) and B-cells
- MHC II participates in antigen presentation to CD4 T-Helper cells
- Exogenous because the pathogen is outside the cells and is taken up by endosomes that break it down
- The degradation products will be combined with MHC II and sent to the surface of the cell for presentation
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Term
Cytokine-related disorder due to: Overproduction of IL-1, IL-6, TNF |
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Definition
- Drop in BP
- Shock
- Fever
- Blood clotting
endotoxin stimulation of macrophages after G- bacterial infection --> septic shock |
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Term
Cytokine-related disorder due to: Massive release of cytokines |
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Definition
superantigen stimulation of T-cells by bacterial toxins --> toxic shock |
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Term
Cytokine-related disorder due to: Decreased expression of IL-2 receptor |
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Definition
Immune suppression
Caused by Trypanosoma cruzi --> Chagas |
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Term
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Definition
With IgM, it the major Ig expressed by mature B-cells
Functions in activation of B-cells by antigens |
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Term
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Definition
- Protects fetus
- Neutralizes bacterial toxins and viruses
- Complement activator
- Plays a huge role in persistent viral, bacterial, and fungal infections
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Term
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Definition
Binds to allergens
Mediates hypersensitivity reactions (such as asthma, hives, hay fever) by inducing degranulation of basophils and mast cells
Protects against parasitic infections |
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Term
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Definition
Main Ig in external secretions (tears, saliva, breast milk, mucus) |
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Term
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Definition
- Analagous to neutrophils in that they are the first to respond to an infection
- Has 10 antigen binding sites
- Activates complement pathway
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Term
Phase of the Adaptive Immune Response |
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Definition
- Antigen recognition
- Lymphocyte activation
- Effector Phase
- Decline (homeostatis)
- Memory
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Term
What is the immunological basis for multiple myeloma? |
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Definition
- Cancer of the cells in the bone marrow --> results in an increase in plasma cells
- There will be a decrease in polymorphonuclear cells
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Term
In patients with multiple myeloma, why are patients considered more susceptible to bacterial infections? |
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Definition
- They have a marked increase in plasma cells, which results in an increase in IgG and they are producing only that particular Ig
Their body is not producing any other Ig (such as IgA, IgD, IgM, etc.)
- This leaves the patient susceptible to other pathogens that other Ig take care of (parasites, no added protection of IgA in tears, etc.)
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Term
What are the two pathways of the complement system? |
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Definition
- Alternate (innate) pathway
- Classical (humoral) pathway
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Term
How is the alternate pathway activated? |
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Definition
Most commonly activated by microbial surfaces or cell components (e.g. lipopolysaccharides) |
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Term
What type of immunity (innate or adaptive) is associated with the alternate pathway? |
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Definition
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Term
What type of immunity (innate or adaptive) is associated with the classical pathway? |
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Definition
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Term
How is the classical pathway activated? |
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Definition
- It is activated by antigen/antibody complexes containing IgM or IgG
- It is the major effector of the humoral immunity
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Term
What are the two major biological activities of complement products? |
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Definition
- Membrane Attack Complex acts as a molecular drill to puncture cell membranes
- Complement cleavage products promote: opsonization (enhancement of phagocytosis) inflammatory responses, degranulation, etc.
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Term
What is the pathological basis of DiGeorge Syndrome and what is the result? |
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Definition
- Deletion of a portion of chromosome 22
- Babies are born without a thymus
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Term
For patients with DiGeorge Syndrome, what is the effect of thymus absence on maturation of T cells? |
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Definition
- Basically, patient will not have maturation of T-cells, because this is where T cells mature
- Since the baby does not have a thymus, its body will rely on bone marrow
- However, T-cells will not have their coreceptors (CD4 or CD8) and therefore no T-helper cells or Cytotoxic T cells
- There will be an accumulation of B cells that won't be stimulated
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