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145 Cards in this Set

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  • Back
What are the 5 cardinal signs of acute inflammation?
1. Red (rubor)
2. Swelling (tumor)
3. Warm (calor)
4. Tender (dolor)
5. Loss of fxn (functio laesa)
What are characteristics of acute inflammation?
1. Edema in tusses due to vascular response
2. Influx of neutrophils
3. Influx of monocytes/macrophages

**Anytime you see neutrophil influx, think acute inflammation
In a parasitic infection, what type of cells would you see?
See eosinophils instead of neutrophils
What type of cells are see in mircobacterium/fungi infections?
This is more of a chronic lesion, so would see more macrophages and fewer of neutrophils
What is the general sequence of events in acute inflammation?
Edema -> neutrophils -> macrophages
What is pavementing?
Endothelium appears to be lines by white cells
With injury, where do changes occur?
in the neutrophil AND in the endothelial cells
What molecules are responsible for the rolling of neutrophils?
Selectins are expressed on the sruface of endothelial cells
How long does it take for an acute inflammatory reaction to occur?
Within a few minutes to an hour after the insult
What is the general problem that occurs in Chediak-Higashi syndrome and diabetes mellitus?
Both of these affect neutrophils so they lose their ability to actively bind, emigrate, and phagocytose and actively participate in the killing of the noxious stimulus
What happens if you cant make C5?

What happens when you have immunoglobulin deficiency?
Cant make C5 then you wont have C5a once complement is activated

W/o the the Ab-Ag complex, you wont stimulate the complement cascade, so you wont get the C5a
What occurs if you have an increase in C5 inactivators?
have compounds in blood that inhibit complement 5, which leads to not having C5a which means you cant have chemotaxis
What are the 3 distinct steps in phagocytosis and degranulation?
1. Recognition
2. Attachment
3. Engulfment
What are some receptors used in recognition/attachment step of phagocytosis?
mannose receptor, MAC-1 integrin, and the scavenger receptor
What is the role of inducible nitric oxide synthase?
Found in macrophages and can bind to free radicals to give you peroxynitrite, which can lead to death/destruction of the material
What is HOCl?
Where are the majority of chemical mediators synthesized?
What substance keeps inflammation in check? How do they work?

they inhibit phosphlipases, which are the very first steo in break down phospholipids into arachidonic acid, which can either go to prostaglands or leuketrienes
What does the cyclo-oxygenase pathway result in?
production of prostaglandins
Name substances that can inhibit the cyclo-oxygenase pathway?
COX1, COX2, aspirin, indomethacin
Define transudate.
fluid is low in protein and has a specific gravity that is less than 1.012

It's an indication of a mild inflammatory rxn
What is the purpose of the red-top tube.
Instead of testing the specific gravity.. one can see if the liquid coagulates. IF it does then its an exudate; if there is no clotting then its a transudate
Define exudate.
Fluid composed of plasma proteins that clots -- composed mainly of plasma proteins and clotting factors
Describe serous exudates.
blister in thermal burn

Serous = aren't many blood cells because there is no infectious component

Usually have bad damage to the blood supply in that area that although its mostly just fluid, serum has high enough protein levels to be considered an exudate
Describe fibrinous exudate.
made up of fibrin--soluble protein within the blood

fibrin comes out of the blood into the tissue or space within the body
Describe purulent exudate.
abcesses are good examples of purulent exudates

WBCs, serum, bacteria, and dead WBCs all mixed together
Describe eosinophilic exudate. When is it often seen?
IgE mediated

asthma and parasitic infections

mainly see eosinophils
Describe hemorrhagic exudate. What is a common cause?

Organisms that damage the blood vessels so you get inflammatory cells plus blood due to hemorrhage
Describe pseudomembranous exudates.
There is damage to the whole layer of endothelium. The whole layer dies and because of that damage to the epithelial layer, you get damage to the underlying blood vessels so you get the serum that comes out
Define edema.
excess fluid in the interstitial tissue, usuyally serous fluid
Define ascites.
edema fluid inside the abdominal cavity
Define pus.
purulent exudate which is rich in leukocytes
What is inflammation?
the response of vascularized living tissue to injury
What are the 2 main components of inflammation?
1. Vascular wall response
2. Inflammatory cell response
How are the effects of inflammation mediated and terminated?
Effects mediated by circulating plasma proteins and by factors produced locally by vessel wall or inflammatory cells

Terminated when offending agent is eliminated and the secreted mediators are removed
Give the characteristics of acute inflammation.
early onset (seconds to mins)
short duration (mins to days)
involving fluid exudate (edema)

Neutrophil emigration
Give the characteristics of chronic inflammation.
later onset (days)
longer duration (weeks to years)

involving lymphocytes and macrophages

inducing blood vessel proliferation and scarring
What are the 4 classical signs of inflammation (most prominent in acute inflammation)?
Heat (calor)
Redness (rubor)
Pain (dolor)
Edema (tumor)

Loss of fxn may also be considered a sign
Define Edema.
excess fluid in interstitial tissue or body cavities, may be either an exudate or transudate
Define exudate.
An inflammatory extravascular fluid that has a high protein concentration and cellular debris

specific gravity above 1020
Define exudation.
extravasation of fluid, proteins, and blood cells from vessels into the interstitial tissue or body cavities
Define Pus
A purulent inflammatory exudate rich in neutrophils and cell debris
Define transudate.
extravascular fluid with low protein content and specific gravity below 1.012

essentially an ultrafiltrate of blood plasma resulting from elevated fluid pressures or diminished osmotic forces in the plasma
What are the 3 major components that contribute to causing the clinical signs of acute inflammation?
1. Alterations in vascular caliber leading to increased blood flow (heat and redness)

2. Structural changes in the microvasculature, permitting plasma proteins and leukocytes to leave the circulation to produce inflammatory exudates (edema)

3. Leukocyte emigration from blood vessels and accumulation at the site of injury (edema and pain)
What are the 2 opposing forces that determine NORMAL fluid exchange in vascular beds?
Hydrostatic pressure - causes fluid to move out of the circulation

Plasma colloid osmotic pressure - causes fluid to move into the capillaries
Describe vasodilation and how it affects vascular pressure?
vasodilation causes increased flow into areas of injury, thereby increasing hydrostatic pressure
Describe vascular permeability and how it affects vascular pressure?
Causes exudation of protein rich fluid and decreases plasma osmotic pressure
With an increase in hydrostatic pressure and a decrease in osmotic pressure, in which direction will fluid flow?
It will flow out of the vascular beds
What is stasis?
It occurs when fluid loss causes concentration of red cells and increased blood viscosity, slowing the blood flow
What are the different pathways that can cause increased vascular permeability?
1. Formation of venule intercellular endothelial gaps
2. Direct endothelial injury
3. Delayed prolonged leakage
4. Leukocyte mediated endothelial injury
5. Increased transcytosis
6. Leakage from new blood vessels
What and how are venule intercellular endothelial gaps formed?
Endothelial cells are induced to contract therey opening intercellular gaps.

Contraction is elicited by chemical mediators (histamine) and occurs rapid, is transient, and is reversible.

Involves only small venules

Can also be caused by cytokines (IL-1/TNF) but will be prolonged (4 to 6 hrs) and protracted (24 hrs or more)
How does direct endothelial injury cause increased vascular permeability?
Severe necrotizing injury causes endothelial cell necrosis and detachment that affects venules, capillaries, and arterioles

Damage usually evokes immediate and sustained endothelial leakage
What is delayed prolonged leakage and how does it contribute to an increase in vascular permeability?
Delayed prolonged leakage beings after a delay of 2 to 12 hours and may last for days.

Venules and capillaries are affected.

Causes: thermal injury, x-rays, UV injury
What is leukocyte mediated endothelial injury and how does it contribute to an increase in vascular permeability?
Results from leukocyte aggregation, adhesion, and emigration across the endothelium.

Leukocyte release of reactive oxygen species and proteolytic enzymes cause endothelial injury or detachment
What is increased transcytosis?
Increased transcytosis means that transendothelial channels have formed by the interconnection of vessels from the vesiculovacuolar organelle.

Certain factors (vascular endothelial growth factor) induce vascular leakage by increasing the number of these channels
How does leakage from new blood vessels increase the vascular permeability?
During repair, endothelial proliferation and angiogensis result in leaky vessels. This persists until the endothelium matures and intercellular jxns are formed.
What is extravasation and what are the steps involved?
Extravasation - leukocyte delivery to site of injury

1. Margination, rolling, and adhesion of leukocytes to the endothelium

2. Transmigration across the endothelium (aka diapedesis)

3. Migration in interstitial tissues toward a chemotactic stimulus
What are the major adhesion molecules involved in leukocyte adhesion and transmigration?
Selectins (E, P, and L) - bind via lectin domains (sugar binding) to oligosaccharides (ie Sialyl Lewis X) on cell surface glycoproteins

Ig family molecules on endothelial cells - ICAM1 (intracellular adhesion molecule 1) and VCAM1(vascular cell adhesion molecule 1); these bind integrins on leukocytes

Integrins on leukocytes bind to members of the Ig family molecules and to the extracellular matrix. The principal integrins that bind to ICAM-1 are the so called beta-2 integrins LFA-1 and Mac-1 (also called CD11a/CD18 and CD11b/CD18); the principal integrin that binds to VCAM-1 is the beta-1 integrin alpha-4::beta-1 (also called VLA4)
How do chemoattractants and chemokines affect adhesion and transmigration?
by modulating the surface expression or avidity of the adhesion molecule
Name the three mechanisms in which modulating molecules induce leukocyte adhesion in inflammation.
1. Redistribution of preformed adhesion molecules to the cell surface

2. Induction of adhesion molecules on endothelium.

3. Increased avidity of binding
How does redistribution of preformed adhesion molecules to the cell induce leukocyte adhesion in inflammation?
After histamine exposure, P selectin is rapidly translocated from the endothelial Weibel-Palade body membranes to the cell surface where it can bind leukocytes
How are adhesion molecules induced to form on the endothelium?
IL-1 and TNF increase endothelial expression of E-selectin, ICAM-1, and VCAM-1

Activated endothelial cells have increased leukocyte adherence
How is avidity increased in order to induce leukocyte adhesion in inflammation?
Increasing avidity is most important for integrin binding

These integrins are normally present on leukocytes in a low affinity form. They are converted to high affinity binding by a variety of chemokines. Activation causes firm adhesion of the leukocytes to endthelium and is required for subsequent transmigration
What are the steps involved in neutrophil adhesion and transmigration in acute inflammation?
1. Endothelial activation
2. Leukocyte rolling
3. Integrin activation and stable adhesion
4. Transmigration (diapedesis)
What interactions occur during transmigration?
This is mediated by homotypic interactions between PECAM-1/CD31 on leukocytes and endothelial cells
What type of leukocyte emigrates into a site of injury?
Depends on the age of the inflammatory response and the original stimulus

Neutrophils predominate during the first 6 to 24 hours, then are replaced by monocytes after 24-48 hours
Why neutrophils invade an injured site first?
Neutrophils are more numerous in the blood than monocytes, they respond more rapidly to chemokines, they respond more rapidly to the particular chemokines, and they attach more firmly to the particular ashesion molecular that are induced on endothelial cells at early points.
Describe the process of chemotaxis.
involves binding of chemotactic agents to specific leukocyte surface G protein couple receptors, which triggers phospholipase C, PIP kinase, and protein kinases

IP(3) --> DAG + PIP(2)

Causes increase cytosolic calcium and GTPase activities that polymeriza actin and facilitate cell movement.
Name 4 things that chemotactic agents activate.
1. Production of arachidonic acid metabolites
2. Degranulation and secretion of lysosomal enzymes
3. Cytokine secretion
4. Increased adhesion molecule expression and increased integrin avidity
What are the three steps involved in phagocytosis?
1. Recognition and binding
--opsonins enhance phagocytosis efficiency by binding to leukocyte receptors

2. Engulfment by encircling pseudopods
3. Killing and degradation of phagocytosed particles
-- accomplished largely by oxygen dependent mechanisms
What are 2 major opsonins?
Ig Fc fragment and the complement fragment C3b
What does the NADPH oxidase system do?
converts oxygen to surperoxide anion and eventually producing hydrogen peroxide
What is the fxn of myeloperoxidase?
Converts hydrogen peroxide and chloride into bleach (HOCl)
What is the difference between leukocyte adhesion deficiency type 1 and type 2?
Type 1 - defective synthesis of beta-2 integrins

Type 2 - is due to a defect in the fucose metabolism causing loss of sialyl Lewis X (ligand for E and P selectin)
What is Chediak-Higashi Syndrome?
Neutrophils have aberrant organellar fusion with defective lysosomal enzyme delivery to phagosomes
What is granulamtous disease?
Inherited defects in NADPH oxidase, leading to a defect to a defect in the respiratory burst, hydrogen peroxide production, and the MPO bactericidal mechanism
What is the most common clinical cause of leukocyte defects?
neutropenia cause by cancer chemotherapy or by metastatic tumor replacing normal bone marrow
What are the first mediators in inflammation?
histamine and serotonin -- they cause vasodilation and increased vascular permeability
What stimulates mast cell release?
physical agents, immune reactions involving IgE, complement fragments C3a and C5a, cytokines, and leukocyte derived histamine releasing factor
What stimulates platelet release?
contact with collagen, thrombin, adenosine diphosphate, antigen-Ab complexes, and platelet activating factor
What is the most important step for the biologic functioning of complement?
activation of the C3
What activates the classical pathway?
C3 cleavage by C3 convertase after fixation of C1 to antigen-Ab complexes
What activates the alternative pathway?
triggered by microbial surface molecules and complex polysaccarides
What triggers the lectin pathway?
Binding to microbial carbs
What are anaphylatoxins?
C3a and C5a
stimulate histamine release from mast cells and thereby increase vascular permeability and vasodilation

C5a also activates the arachidonate metabolism causing additional inflammatory mediator release
How is complement activation regulated?
cell associated (decay accelerated factor) and circulating (Chloride) regulatory protein
What does a defect in DAF cause?
Paroxysmal nocturnal hemoglobinuria - recurrent complement mediated red cell lysis and anemia
What causes hereditary angioneurotic edema?
chloride inhibitor deficiency
What generates bradykinin?
Plasma protein kininogens are cleaved by specific proteases called kallikreins to generate bradykinin
What produces clotting factor XIIa?
surface activation of Hageman factor and kallikrein
What is the function of XIIa?
converts plasma prekallikrein into kallikrein
Describe the clotting system.
Series of plasma proenzymes that can be activated by Hageman factor, resulting in the activation of thrombin, cleavage of fibrinogen, and generation of fibrin clot
What is plasmin's function?
plasmin degrades fibrin, thereby solubilizing the clot

Plasma also cleaves C3 to produce C3 fragments, forming fibrin split products that increase vascular permeability and activating Hageman factor
What are eicosanoids?
lipid short range signaling molecules from membrane derived arachidonic acid
What does Cyclooxygenase generate? What inhibits this pathway?
prostaglandins and thromboxanes

What does lipoxygenase produce?
leukotrienes and lipoxins
What do prostaglandin I2(prostacyclin) and prostaglandin E2 cause?

E2 also casues an increase in sensitivity to painful stimula and can mediate fever
What do the following cause:

thromboxane A2?
Leukotrienes C4, D4, and E4?
Leukotriene B4?
A2 - vasoconstriction
C4, D4, E4 - increase vascular permeability and vasoconstriction

B4 - chemotactic agent
lipoxins - negative regulators of leukotriene action
Which cells produce Platelet Activating Factor?
mast cells and other leukocytes
What does PAF cause?
platelet aggregation and release, bronchoconstriction, vasodilation, increased vascular permeability, increased leukocyte adhesion, and leukocyte chemotaxis
What are the major cytokines mediating inflammation? Where are they produced?
TNK\F and IL-1

activated macrophages
What do TNF and IL-1 induce?
endothelial activation, including induction of endothelial adhesion molecules and chemical mediators, enzymes associated with matrix remodeling, and increases in endothelial thrombogenicity
Describe the acute phase response.
fever, anorexia, lethargy, neutrophilia, release of corticotropin and corticosteroids, and hemodyname effects of septic shock
How does TNF-alpha regulate body mass?
it promotes lipid and protein mobilization and by suppressing appetite.

Sustained TNF production contributes to cachexia, a pathologic state characterized by weight loss and anorexia that accompanies some infections and neoplasias.
What are the 4 major classes of chemokines?
1. CXC - recruit neutrophils - example is IL-8

2. CC - generally recruit monocytes, eosinophils, basophils, and lymphocytes but NOT neutrophils - example eotaxin recruits eosinophils

3. C - specific for lymphocytes

4. CX(3)C - fractalkine
Describe the fxn of the different forms of fractalkine.
cell surface form - promotes firm lymphocyte and monocyte adhesion

soluble form is a chemoattractant for the same cells
What is the other name for nitric oxide?
endothelium derived relaxation factor (EDRF)
Describe the acute phase response.
fever, anorexia, lethargy, neutrophilia, release of corticotropin and corticosteroids, and hemodyname effects of septic shock
How does TNF-alpha regulate body mass?
it promotes lipid and protein mobilization and by suppressing appetite.

Sustained TNF production contributes to cachexia, a pathologic state characterized by weight loss and anorexia that accompanies some infections and neoplasias.
What are the 4 major classes of chemokines?
1. CXC - recruit neutrophils - example is IL-8

2. CC - generally recruit monocytes, eosinophils, basophils, and lymphocytes but NOT neutrophils - example eotaxin recruits eosinophils

3. C - specific for lymphocytes

4. CX(3)C - fractalkine
Describe the fxn of the different forms of fractalkine.
cell surface form - promotes firm lymphocyte and monocyte adhesion

soluble form is a chemoattractant for the same cells
What is the other name for nitric oxide?
endothelium derived relaxation factor (EDRF)
What are the functions of NO in its local environment?
1. Vasodilation
2. inhibit platelet aggregation and adhesion
3. kill certain microbes and tumor cells - via free radical formation
What is NO synthesized from?
arginie, molecular oxygen, NADPH, and other cofactors by nitric oxide synthase (NOS)
What are the three types of NOS?
endothelial NOS
cytokine inducible NOS
neuronal NOS
What are the expression patterns of NOS?
eNOS and nNOS - constitutively expressed but become active only in the setting of increased cytoplasmic calcium

iNOS - synthesized by macrophages after induction by certain cytokines
What are the functions of each type of NOS?
eNOS - maintaining vascular tone

iNOS - reduce leukocyte recruitment
What are the 2 types of granules found in neutrophils?
1. smaller specific (for secondary) granules

2. larger azurophila (or primary) granules
What are the effects of reactive oxygen species?
1. endothelial cell damage causing increased vascular permeability

2. inaactivation of antiproteases resulting in unopposed protease activity

3. injury to multiple cell types
What is the role of neuropeptides?
play a role in initiating and propagating inflammatory responses
What is Substance P?
powerful mediator of vascular permeability, transmits pain signals, regulated blood pressure, and stimulates immune and endocrine cell secretion
Describe the response to hypoxia.
hypoxia alone can directly induce inflammatory response

largely mediated by the protein hypoxia induced factor 1 alpha produced by cells deprived of oxygen
Describe the response to necrotic cells.
elicits inflammatory reactions designed to eliminate these cells.
What are the outcomes of acute inflammation?
1. Complete resolution with regeneration of native cells and restoration of normalcy

2. Healing by connective tissue replacement (fibrosis) occurs after substantial tissue destruction when inflammation occurs in non-regenerating tissues or in the setting of abundant fibrin exudation -- abcess formatino will be replaced by fibrosis

3. Progression to chronic inflammation
Describe serous inflammation.
reflected by tissue fluid accumulation and indicates a modest increase in vascular permeability
Describe fibrinous inflammation.
marked increase in vascular permeability with exudates containing large amounts of fibrinogen
Describe suppurative or purulent inflammation.
production of purulent exudates (pus) consisting of leukocytes and necrotic cells
Define an abcess.
refers to a localized collection of purulent inflammatory tissue accompanied by lquefactive necrosis
What are 3 reasons chronic inflammation can occur.
1. Following an acute inflammation either because the inciting stimulus persists or because normal healing is somehow interrupted

2. From repeated bouts of acute inflammation
3. Most commonly as low grade, smoldering response without prior acute inflammation
Describe the characteristics of chronic inflammation.
1. infiltration with mononuclear inflammatory cells

2. tissue destruction
3. attempts at healing by connective tissue replacement, accomplished by vascular proliferation (angiogenesis), and fibrosis
Activated T lymphocytes activate what?
activate monocytes and macrophages which then activate T and B lymphcyte function
Eosinophils are recruited in what type of infection? Their granules contain what susbtance?
parasitic infection

Contain major basic protein - a cationic molecule that is toxic to parasites but also lyses mammalian epithelium
What is a granuloma?
focal accumulations of activated macrophages
What are epitheloid macrophages?
macrophages that have been activated and become enlarged and flattened
In granulomatous inflammation, describe the epitheloid macrophages.
they are surrounded by a collar of lymphocytes elaborating factors necessary to induce macrophage activation
What are giant cells?
activated macrophages that fuse
What are immune granulomas?
formed by T cell mediated responses to persistent antigens
What causes macrophage transformation to epitheloid cells and multinucleate giant cells?
interferon gamma
What is the prototypical immune granuloma caused by?
tuberculosis bascillus
What is the name for when lymphatics become inflamed? when draining lymph nodes become inflamed?

Systemic changes associated with inflammation are collectively called?
acute phase response - or in severe cases the systemic inflammatory response syndrome (SIRS)
What are the clinical and pathologic changes associated with acute phase response?
1. Fever - 1-4 degrees in response to pyrogens

2. Acute phase proteins - plasma proteins that increase several hundred fold - CRP, fibrinogen, and serum amyloid A (SAA)

3. Leukocytosis

4. Others: increased BP, decr sweating, shivering, chills, anorexia, etc
What is the clinical triad associated with septic shock?
1. disseminated intravascular coagulation

2. hypoglycemia
3. Cardiovascular failure
What are pyrogens?
substances that stimulate prostaglandin synthesis in the hypothalamus
What is leukocytosis? How does it occur?
increased white cell number in peripheral blood

occurs by accelerated release of bone marrow cells, typically with increased numbers of immature neutrophils (shift to left)