Pathology Flashcards
Neurons most vulnerable to hypoxic-ischemic insults include
Purkinje cells of the cerebellum and
pyramidal cells of the hippocampus and neocortex (zones 3, 5, 6).
Red infarct
liver, lung, intestine, testes
LITL
Free radicals damage cells via
membrane lipid peroxidation, protein modification, DNA breakage.
Free radicals are produced via:
radiation exposure (eg, cancer therapy) metabolism of drugs (phase I) redox reactions nitric oxide (eg, inflammation) transition metals WBC (eg, neutrophils, macrophages) oxidative burst
MR! MR! WoN!
Free radicals can be eliminated by
Protein metal carriers (eg, transferrin, ceruloplasmin).
Antioxidants (eg, vitamins A, C, E)
Spontaneous decay
Enzymes (scavenging) (eg, catalase, superoxide dismutase, glutathione peroxidase)
PASE
Dystrophic calcification
fat necrosis
abscesses
infarcts
liquefactive necrosis
atherosclerotic plaques
thrombi
congenital CMV rubella schistosomiasis TB (lung and pericardium) and other granulomatous infections toxoplasmosis CREST syndrome
psammoma bodies
FAIL AT CREST momma!
Lipofuscin locations
heart, colon, liver, kidney, eye, and other organs.
KLECH
Localized Amyloidosis
A- Alzheimer disease (beta-amyloid protein)
D - Diabetes mellitus (Type 2) -Islet amyloid polypeptide (IAPP)
A - atrial amyloidosis - Isolated (ANP )
M - Medullary thyroid cancer - Calcitonin (A Cal)
S - Systemic Senile (age-related) amyloidosis [Normal (wild-type)transthyretin (TTR)]
ADAM’S amyloid
Histamine causes
Rubor (redness) and calor (warmth)
Tumor (swelling)
Dolor (pain)
“triple positive”
Bradykinin causes
Rubor (redness) and calor (warmth)
Dolor (pain)
NO cause
Rubor (redness) and calor (warmth)
Prostaglandins cause
Rubor (redness) and calor (warmth)
Dolor (pain) (PGE2)
Seratonin + Leukotrians cause
Tumor (swelling)
Fever explain process
Pyrogens (eg, LPS) induce macrophages to release IL-I and TNF -> inc COX activity in perivascular cells of the hypothalamus -> inc PGE2 -> inc temperature set point.
Acute phase reactants
UPREGULATED
Ferritin Fibrinogen SAA Hepcidin CRP
More Fn FiSH in the C! (sea).
Acute phase reactants
DOWNREGULATED
Albumin
Transferrin
Erythrocyte sedimentation rate increased by
Most anemias
Infections
information (eg, giant cell [temporal] arteritis,
polymyalgia rheumatica)
Cancer (eg, metastases, multiple myeloma)
Renal disease (end-stage or nephrotic syndrome)
Pregnancy
Inflammation and infection CRAP
Erythrocyte sedimentation rate decreased by
Sickle cell anemia (altered shape) Polycythemia (Inc RBCs "dilute" aggregation factors) HF Microcytosis hypoFibrinogenemia
Shape Size Amount and FF
Acute inflammation mediators
I - Inflammasome
M - mast cells
T - Toll-like receptors
A - arachidonic acid metabolites
N - neutrophils
ned
in the
B - basophils E - eosinophils A - antibodies (preexisting) C - complement H - Hageman factor (factor XII)
Acute inflammation outcome
S - Scarring
C -Chronic inflammation (antigen presentation by macrophages and other APCs - activation of CD4+ Th cells)
R - Resolution and healing (IL-10, TGF-beta)
A - Abscess (acute inflammation walled off by fibrosis)
P - Persistent acute inflammation (IL-8)
Leukocyte extravasation steps
Margination and rolling -> Tight binding (adhesion) -> Diapedesis (transmigration) -> Migration.
Margination and rolling defective in
leukocyte adhesion deficiency type 2 (dec. Sialyl Lewis X)
Tight binding (adhesion) defective in
leukocyte adhesion
deficiency type I (dec. CDl8
integrin subunit)
Margination and rolling molecules: location and target - Sialyl LewisX
on: LEUKOCYTE
binds:
E-selectin (upregulated by TNF and IL-I)
P-selectin (released from Weibel Palade bodies)
on: VASCULATURE/STROMA
Margination and rolling molecules: location and target - L-selectin
on: LEUKOCYTE
binds: GlyCAM-1, CD34 on VASCULATURE/STROMA
Tight binding (adhesion) molecules: location and target -ICAM-1 (CD54)
on:VASCULATURE/STROMA
binds: CDll/18 integrins
(LFA-1, Mac-I) on LEUKOCYTE
Tight binding (adhesion) molecules: location and target - VCAM-1 (CDI06)
on: VASCULATURE/STROMA
binds: VLA-4 integrin on LEUKOCYTE
Diapedesis (transmigration) WBC molecules: location and target - PECAM-1 (CD31)
on: VASCULATURE/STROMA
binds: PECAM-1 (CD31) on LEUKOCYTE
Migration - molecules: location and target - chemotactic signals
on: VASCULATURE/STROMA
Chemotactic factors: C5a, IL-8, LTB4, kallikrein, platelet-activating
factor
CD# of GlyCAM-1
CD34
CD# of PECAM-1
CD31
CD# of VCAM-1
CDI06
CD# of ICAM-1
CD54
CD# of LFA-1, Mac-I
CDll/18 integrins
Chronic inflammation OUTCOMES
Scarring, amyloidosis, and neoplastic transformation
SAN
Chronic inflammation STIMULI
Persistent infections (eg, TB, T pallidum, certain fungi, and viruses) - type IV hypersensitivity, autoimmune diseases, prolonged exposure to toxic agents (eg, silica) and foreign material.
Things that are not supposed to be there.
Wound healing MEDIATORS - FGF mediates
Stimulates angiogenesis
Wound healing MEDIATORS - TGF beta mediates
Angiogenesis, fibrosis
Wound healing MEDIATORS - VEGF mediates
Stimulates angiogenesis
Wound healing MEDIATORS - PDGF mediates
- Induces vascular remodeling
- smooth muscle cell migration
- Stimulates fibroblast growth (for collagen synthesis)
Wound healing MEDIATORS - Metalloproteinases mediates
Tissue remodeling
Wound healing MEDIATORS - EGF mediates
Stimulates cell growth via tyrosine kinases (eg, EGFR/ErbBl)
PDGF Secreted by
activated platelets and macrophages
PHASE OF WOUND HEALING - Proliferative (day 3-weeks after wound)
EFFECTOR CELLS.
Fibroblasts, myofibroblasts, endothelial cells, keratinocytes, macrophages.
Granulomatous inflammation infections ETIOLOGIES
• Bacterial: Mycobacteria (tuberculosis, leprosy), Bartonella henselae (cat scratch disease; stellate necrotizing granulomas), Listeria monocytogenes (granulomatosis infantiseptica), Treponema pallidum (3° syphilis) • Fungal: endemic mycoses (eg, histoplasmosis) • Parasitic: schistosomiasis
BLT w/ MAYO and Mushroom for SHIZEL!
Granulomatous inflammation NON-infections ETIOLOGIES in general:
Immune-mediated
Vasculitis
Foreign material
Chronic granulomatous disease
Granulomatous inflammation NON-infections ETIOLOGIES - Immune-mediated:
sarcoidosis, Crohn disease, 1° biliary cholangitis, subacute (de Quervain /granulomatous) thyroiditis
Sick Chicks Big Tits
Granulomatous inflammation NON-infections ETIOLOGIES (Vasculitis):
Granulomatosis with polyangiitis (Wegener)
Eosinophilic granulomatosis with polyangiitis (Churg Strauss)
Giant cell (temporal) arteritis
Takayasu arteritis