CELL INJURY DEFINITIONS Flashcards

1
Q

reversible functional and morphological changes

A

Reversible cell injury

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2
Q

cell cannot recover from injury resulting in cell death (necrosis or apoptosis)

A

Irreversible cell injury

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3
Q

reduces aerobic respiration

A

Oxygen deprivation*

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4
Q

mechanical trauma, extreme temperatures, sudden changes in atmospheric pressure, radiation and electric
shock

A

Physical agents

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5
Q

glucose or salt in hypertonic concentrations (electrolyte imbalance), oxygen at toxic levels, poisons (arsenic, cyanide, etc.), environmental and air pollutants, insecticides/herbicides, recreational and therapeutic drugs

A

Chemical agents and drugs

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6
Q

bacteria, fungi, parasites, viruses

A

Infectious agents

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7
Q

injurious reactions to self-antigens (autoimmunity), inflammation

A

Immunologic reactions

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8
Q

deficiency of functional proteins (enzyme defects, accumulation of damaged DNA or misfolded proteins)

A

Genetic derangements

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9
Q

vitamin or protein-calorie deficiency, excess cholesterol

A

Nutritional imbalances

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10
Q

blebbing, blunting and loss of microvilli

A

Plasma membrane alterations

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11
Q

swelling and appearance of small amphorous densities

A

Mitochondrial changes

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12
Q

clumping of nuclear

chromatin, disaggregation of granular and fibrillar elements

A

Nuclear alterations

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13
Q

ER swelling, cellular swelling, loss of microvilli, blebs

A

Failed Na+ pumps

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14
Q

decreased glycogen, lactic acid production → acidosis

A

Increased glycolysis

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15
Q

influx of Ca2+ decreasing phospholipids in membrane

A

Failure of Ca2+ pumps

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16
Q

structural disruption of protein synthesis and lipid deposition

A

Depletion of ATP

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17
Q

occur during normal metabolic processes (mitochondrial

respiration and energy generation)

A

Reduction-oxidation (redox) reactions

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18
Q

weapons for destroying microbes and other substances

A

Produced in phagocytic leukocytes

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19
Q

vasodilator (important chemical mediator and part of inflammatory response), can act as free radical and be converted to highly reactive ONOO-

A

Nitric oxide

20
Q

condition where there are increased amounts of free radicals

A

Oxidative stress

21
Q

ischemia and certain toxins cause influx of cytosolic calcium

A

Loss of calcium homeostasis

22
Q

decreased ATP

23
Q

decreased phospholipids

A

Phospholipase

24
Q

disrupt cell membrane and cytoskeletal proteins

25
damage nuclear chromatin
Endonucleases
26
(↓ phospholipid synthesis, ↑ phospholipid breakdown) - contents leak into the membrane
Defects in membrane permeability
27
sensitive to many types of injurious stimuli (increased cytosolic Ca2+, ROS, oxygen deprivation, etc.), results in biochemical abnormalities
Mitochondrial damage and dysfunction
28
formation of reactive oxygen species (free radicals)
Abnormal oxidative phosphorylation
29
ischemia tends to cause more rapid and severe cell and tissue injury than does hypoxia in the absence of ischemia because aerobic and anaerobic respiration compromised
Reversible ischemia (may become irreversible)
30
cells proceed to die after blood flow restored; injury is paradoxically exacerbated and proceeds at an accelerated pace - as a consequence, reperfused tissues may sustain loss of cells in addition to the cells that are irreversibly damaged at the end of ischemia (contributes to tissue damage during myocardial and cerebral infarction and following therapies to restore blood flow - ex. myocardial infarction, stroke, organ transplantation)
Ischemic/reperfusion injury
31
major limitation to drug therapy, liver frequent target of drug toxicity
Chemical (Toxic) Injury
32
some chemicals injure cells directly by combining with critical molecular components
Direct acting chemicals
33
most toxic chemicals are not biologically active in their native form but convert to reactive toxic metabolites which then act on target molecules
Convert to toxic metabolites
34
a single unpaired electron in an outer orbital making it HIGHLY REACTIVE and UNSTABLE
Free radicals
35
energy knocks electrons to outer orbitals
Radiation
36
ex. normal respiration
Endogenous redox reactions
37
iron (hemoglobin), copper; donate or accept electrons during intracellular reactions and catalyze free radical formation (ex. Fenton reaction)
Transition metals
38
important chemical mediator (vasodilator)
Nitric oxide
39
unsaturated fatty acids of membrane lipids attacked by O2-
Lipid peroxidation of membranes
40
free radicals promote oxidation of AA side chains, formation of cross-linkages, and polypeptide fragmentation; disrupts conformation of structural proteins enhancing proteosomal degradation of unfolded and misfolded proteins
Oxidative modifications of proteins
41
free radicals cause single and double-stranded breaks in DNA, cross-linking of DNA strands and formation of adducts (ex. cellular aging)
DNA fragmentation
42
endogenous (self-produced), exogenous (supplements); block initiation of free radical formation and inactivate (scavenge) free radicals
Antioxidants
43
inherently unstable and spontaneously decay
Spontaneous decay
44
catalase, superoxide dismutases, glutathione peroxidase
Free radical scavenging enzymes
45
materials from external environment taken up and degraded
Heterophagy
46
degeneration of intracellular organelles *Common phenomenon involved in removal of damaged or senescent organelles
Autophagy