Inflammation & tissue repair Flashcards
process of removing harmful agents and beginning repair process
Inflammation
Acute inflammation is part of _____ immunity
Innate
PAMPs are recognized by these receptors on endothelium, dendritic cells, macrophages, and WBCs
Toll-like receptors
Necrotic tissue is recognized by these
Damage-associated molecular patterns (DAMPs)
Examples: uric acid, free DNA, low K+
DAMPs are recognized by these receptors present on all cells
NOD-like receptors
DAMPs are recognized by NOD-like receptor to produce ________
Inflammasome
Inflammasome activates this enzyme
Caspase 1
(which activates IL-1 –> fever and leukocyte recruitment)
Caspase 1 activates this
IL-1 –> fever and leukocyte recruitment
Caspase 1 is involved in this process
DAMPs are recognized by NOD-like receptor to produce inflammasome, which then activates caspase 1 to activate IL-1 –> fever and leukocyte recruitment
= Recognition of threat; begins process of acute inflammatory response
3 main phases of leukocyte recruitment during acute inflammation
Dilation of small arterioles (increase blood flow)
Increased vascular permeability (leakage of protein rich fluid)
Emigration of leukocytes from vessel in tissue
Dilation of small arterioles during acute inflammation is mediated by these
Histamines
Dilation of small arterioles increases or decreases capillary blood flow?
Increases
Increased blood flow leads to redness (rubor) and warmth (color)
____ blood flow allows leukocytes to leave circulation
Slow
Leukocyte margination occurs during acute inflammation due to this
Stasis (slow blood flow)
Leukocyte rolling is mediated by these
Selectins
Leukocyte adhesion to endothelium is mediated by this interaction
Integrin : adhesion molecule interaction
Leukocyte migration across vessel wall occurs in venules toward ______ gradient
Chemokine
Increased vascular permeability occurs via these 2 mechanisms
Endothelial contraction (mediated by histamines, leukotrienes, bradykinins)
Endothelial damage (detachment from basement membrane)
Endothelial contraction causes increased vascular permeability is mediated by these 3 things, and is rapid and short-lived
Histamines, Leukotrienes, Bradykinins
Mechanism of increased vascular permeability that is rapid and short-lived (minutes)
Endothelial contraction
Mechanism of increased vascular permeability that may be long-lived (hours to days); caused by thermal burns, some microbial toxins
Endothelial damage
Increased vascular permeability allows _____ rich exudate to flow into tissues, causing swelling
Protein and cell-rich
Key cell types recruited to site of acute inflammation are:
Phagocytes (neutrophil and macrophage)
Earliest cell to arrive in acute inflammation
Neutrophils
Main cell that arrives at site of acute inflammation
Macrophage
Neutrophils arrive at site of acute inflammation after _____ hours
6-24 hours
Earliest cell
Macrophages arrive at site of acute inflammation after _____ hours
24-48
(later; after neutrophils)
Leukocytes are brought to site of acute inflammation via chemotaxis, mediated by these 4 things
Bacterial production (e.g. LPS)
Cytokines
Complement (especially C5a)
Arachidonic acid metabolites (e.g. leukotriene B4)
Step of acute inflammation that involves innate anti-inflammatory processes
Regulation
Membrane bound threat destruction can involve either of these
Phagolysosome / inflammasome
_______ apoptosis immediately after phagolysosome destruction is involved in the regulation step of acute inflammation
Neutrophil
2 Anti-inflammatory mediators involved in the regulation step of acute inflammation
IL-1:IL-1 receptor antagonist
Bradykinin (kinases)
2 protease inhibitors involved in the regulation step of acute inflammation
Serum alpha-1 antitrypsin
Neutrophil elastase
Excess tissue liquefaction is a possible outcome of acute inflammation that leads to this
Abscess
Liquefaction necrosis is a possible outcome of acute inflammation that involves _____ surrounded by fibrosis
PMNs (polymorphonuclear leukocytes = neutrophils, basophils, eosinophils)
Term that describes excess tissue liquefaction (pus forming)
Suppuration
Early repaired tissue; early scar
Granulation tissue
Cells that lay down collagen in scar formation
Fibroblasts
Immunodeficiency due to defective Beta chain of neutrophil integrins
Prevents WBC:endothelial adhesion and tissue migration
Delayed umbilical cord separation, followed by omphalitis
Elevated WBC count
Frequent/recurrent indolent bacterial infection
May have skin/other sites necrotizing infection/abscess without pus
Leukocyte adhesion deficiency-1
Elevated WBC count and chronic skin infections with no pus are indicative of this condition
Leukocyte adhesion deficiency-1
3 clinical signs of Leukocyte adhesion deficiency-1
Delayed umbilican cord separation, followed by omphalitis
Elevated WBC count
Frequent/recurrent skin (or other sites) infections without pus
Leukocyte adhesion deficiency-1 is due to defective this
Defective Beta chain of neutrophil integrins
Leukocyte adhesion deficiency-1 prevents this
WBC:endothelial adhesion and tissue migration
(due to defective beta chain of neutrophil integrins)
During phagocytosis, these structures surround and engulf particles into phagosome
Pseudopods
Organelle that produces materials to kill/digest offending agent
Lysosome
These are produced after phagolysosome fusion and during respiratory burst of neutrophils
ROS
How many components does NADPH oxidase have?
7; some in membrane, some in cytoplasm
This process results in the NADPH oxidase components being brought together to form active enzyme
Phagocytosis
Reactive nitrogen and reactive oxygen species are produced during this step in phagocytosis
Phagolysosome fusion
Immune deficiency due to defective phagosome-lysosome fusion
Autosomal recessive mutation of LYST gene
Affects neutrophil granules, melanocyte granules (partial albinism), neuronal axonal vesicle transport (peripheral neuropathy), platelet granules (bleeding disorder)
Neutropenia
Neutrophils and lymphocytes with LARGE fused granules
Delayed microbial killing
Mostly skin/mucosal infections
Bleeding diathesis
Chediak-Higashi Syndrome
Chediak-Higashi Syndrome is due to defective this
Phagosome-lysosome fusion
Chediak-Higashi Syndrome
is caused by an autosomal recessive mutation of this
LYST gene (LYSosomal Traffic regulator)
Chediak-Higashi Syndrome affects these 4 cells
Neutrophil granules (innate immune deficiency)
Melanocyte granules (partial albinism)
Neuronal axonal vesicle transport (peripheral neuropathy)
Platelet granules (bleeding disorder)
Condition characterized by neutrophils and lymphocytes with LARGE fused granules
Chediak-Higashi Syndrome
Condition that can involve albinism, bleeding diathesis, peripheral neuropathy, delayed microbial killing
Chediak-Higashi Syndrome
Mediator of acute inflammation:
Vasoactive amine released by mast cells (preformed and stored in granules)
Released by various stimuli
Causes vasodilation and venule permeability
Histamine
Histamine is released by these cells
Mast cells
2 actions of histamine
Vasodilation and Venule permeability
Mediator of acute inflammation:
Arachidonic acid metabolite
Produced by lipooxygenase in mast cells, other WBCs (preformed and stored in granules)
Causes neutrophil chemotaxis and activation, smooth muscle contraction
Leukotrienes
Leukotrienes are a metabolite of this
Arachidonic acid
Leukotrienes are produced by this enzyme in mast cells and other WBCs
Lipooxygenase
3 actions of leukotrienes
Neutrophil chemotaxis
Neutrophil activation
Smooth muscle contraction
Mediator of acute inflammation:
Arachidonic acid metabolite
Produced by cyclo-oxygenase in mast cells, endothelium, platelets, other WBCs (preformed and stored in granules)
Causes neutrophil chemotaxis and vascular permeability
Prostaglandins
Prostaglandins are metabolites of this
Arachidonic acid
Prostaglandins are produced by this enzyme in mast cells, endothelium, platelets, other WBCs
Cyclo-oxygenase
2 actions of prostaglandins
Neutrophil chemotaxis
Vascular permeability
Lipooxygenase in mast cells and other WBCs produce this mediator of acute inflammation
Leukotrienes