Immunology - First Aid Flashcards

1
Q

LN Follicle is the site of…

A

B-cell localization and proliferation.

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2
Q

In the outer cortex, primary follicles are…

A

dense and dormant.

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3
Q

Secondary follicles have…

A

pale central germinal centers.

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4
Q

The LN medulla consists of…

A

medullary cords (closely packed lymphocytes and plasma cells and medullary sinuses).

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5
Q

Medullary sinuses communicate with…

A

efferent lympmhatics and contain reticular cells and macrophages.

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6
Q

The LN paracortex houses…

A

T cells. It is the region of the cortex between the follicles and medulla.

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7
Q

The paracortex contains high endothelial venules through which…

A

T and B cells enter from the blood.

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8
Q

The paracortex is not well developed in…

A

pts with DiGeorge syndrome.

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9
Q

The paracortex enlarges in…

A

an extreme cellular immune response (ex. viral infection).

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10
Q

Cervical LNs drain…

A

the head and neck.

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11
Q

Hilar LNs drain…

A

the lungs.

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12
Q

Mediastinal LNs drain…

A

the trachea and esophagus.

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13
Q

Axillary LNs drain…

A

the upper limb, breast, and skin above the umbilicus.

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14
Q

Celiac LNs drain…

A

the liver, stomach, spleen, pancreas and upper duodenum.

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15
Q

Superior mesenteric LNs drain…

A

the lower duodenum, jejunum, ileum, and colon to the splenic flexure.

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16
Q

Inferior mesenteric LNs drain…

A

the colon from the splenic flexure to the upper rectum.

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17
Q

Internal iliac LNs drain…

A

the lower rectum to teh anal canal (above pectinate), bladder, vagina and prostate.

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18
Q

The para-aortic LNs drain…

A

testes, ovaries, kidneys and uterus.

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19
Q

The superficial inguinal LNs drain…

A

the anal canal (below pectinate), and skin below the umbilicus (except popliteal).

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20
Q

The popliteal LNs drain…

A

the dorsolateral foot and posterior calf.

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21
Q

The right lymphatic duct drains…

A

the right side of the body above the diaphragm.

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22
Q

The thoracic duct drains…

A

everything else into the junction of the left subclavian and internal jugular veins.

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23
Q

The sinusoids of the spleen are…

A

long, vascular channels in the red pulp with fenestrated “barrel hoop” basement membrane.

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24
Q

In the spleen, T cells are found in…

A

the periarterial lymphatic sheath within the white pulp.

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25
In the spleen, B cells are found in...
follicles within the white pulp.
26
The marginal zone of the spleen is in between the...
red pulp and white pulp, contains APCs and specialized B cells, and is where APCs present blood-borne antigens.
27
Macrophages in the spleen act to...
remove encapsulated bacteria.
28
Splenic dysfunction (postsplenectomy, sickle cell) leads to...
decreased IgM which leads to decreased complement activation, which leads to decreased C3b opsonization which leads to increased susceptiblity to encapsulated organisms.
29
Encapsulated organisms
SHiNE SKis 1. Strep pneumo 2. H. influenzae 3. N. meningitidis 4. E. coli 5. Salmonella 6. Klebsiella 7. group B Strep
30
Postsplenectomy Findings
1. Howell-Jolly bodies (nuclear remnants) 2. target cells 3. thrombocytosis
31
The thymus is the...
site of T-cell differentiation and maturation. It is encapsulated.
32
The thymus comes from the...
epithelium of the 3rd pharyngeal pouches. Contains lymphocytes of mesenchymal origin.
33
The thymus cortex is...
dense with immature T cells.
34
The thymus medulla is...
pale with mature T cells and Hassall corpuscles containing epithelial reticular cells.
35
Components of Innate Immunity
- neutrophils - macrophages - monocytes - dendritic cells - NK cells - complement
36
Components of Adaptive immunity
- T cells - B cells - circulating antibodies
37
Innate immunity resistance
- germline encoded | - resistance persists through generations, does not change within an organism's lifetime
38
Adaptive immunity resistance
- variation through VDJ recombination during lymphocyte development - microbial resistance not heritable
39
Innate immunity response to pathogens
- nonspecific | - occurs rapidly (mins to hrs)
40
Adaptive immunity response to pathogens
- hihgly specific, refined over time | - develops over long periods; memory response is faster and more robust
41
Physical barriers of the innate immune resposne
- epithelial tight junctions | - mucus
42
Innate immunity secreted proteins
lysozyme complement CRP defensins
43
Adaptive immunity secreted proteins
immunoglobulins
44
Innate immunity key features in pathogen recognition
-TLRs: pattern recognition receptors that recgonize PAMPs
45
examples of PAMPs include...
LPS (gram negative bacteria) flagellin (bacteria) ssRNA (viruses)
46
Adaptive immunity key features in pathogen recognition
Memory cells: activated B and T cells; subsequent exposure to a previously encountered antigen leads to a stronger, quicker immune response
47
MHC is encoded by...
HLA genes and presents antigen fragments to T cells and binds TCRs.
48
MHC I loci
HLA-A HLA-B HLA-C
49
MHC II loci
HLA-DR HLA-DP HLA-DQ
50
MHC I Binding
TCR and CD8
51
MHC II Binding
TCR and CD4
52
MHC I Expression
expressed on all nucleated cells; not expressed on RBCs
53
MHC II expression
only on APCs
54
MHC I Function
present endogenously synthesized antigens (viral) to CD8 cytotoxic T cells
55
MHC II Function
present exogenously synthesized protesin (bacterial proteins, viral capsid proteins) to T helper cells
56
MHC I Antigen loading
antigen peptides loaded onto MHC I in RER after delivery via TAP peptide transporter
57
MHC II Antigen loading
antigen loaded following release of invariant chain in an acidified endosome
58
MHC I mode of transport to cell surface
Beta-2-microglobulin
59
HLA-A3 association
hemochromatosis
60
HLA-B27 association
Psoriatic arthritis Ankylosing spondylitis arthritis of IBD Reactive arthritis
61
HLA-DQ2/DQ8 association
celiac disease
62
HLA-DR2 association
MS hay fever SLE Goodpasture
63
HLA-DR3 association
T1DM SLE Graves
64
HLA-DR4 association
Rheumatoid arthritis | T1DM
65
HLA-DR5 association
``` Pernicious anemia (leading to B12 deficiency) Hashimoto ```
66
NK cells use...
perforin and granzymes to induce apoptosis of virally infected cells and tumor cells.
67
Activity of NK cells is enhanced by...
IL-2 IL-12 IFN-beta IFN-alpha
68
NK cells are induced to kill when exposed to...
a nonspecific activation signal on a target cell and/or to an absence of class I MHC on target cell surface.
69
NK cells also kill via...
antibody-dependent cell-mediated cytotoxicity (CD16 binds Fc region of bound Ig, activating the NK cell).
70
Major functions of B cells (3)
1. recognize antigen 2. produce antibody 3. maintain immunologic memory
71
To recognize antigen, B cells...
undergo somatic hypermutaiton to optimize antigen specificity.
72
To proudce antibody, B cells differentiate into...
plasma cells to secrete specific Igs.
73
To maintain immunologic memory, memory B cells...
persist and accelerate future response to Ag.
74
CD4 T cells function to...
help B cells make antibody and produce cytokines to activate other cells of the immune system.
75
CD8 T cells function to...
kill virus-infected cells directly.
76
Other T cell functions
- delayed cell-mediated hypersensitivity (type IV) | - acute and chronic cellular organ rejection
77
Positive selection occurs in the...
thymic cortex. T cells expressing TCRs capable of binding surface self MHC molecules survive.
78
Negative selection occurs in the...
medulla. T cells expressing TCRs with high affinity for self antigen undergo apoptosis.
79
Antigen presenting cells (3)
1. B cells 2. macrophages 3. dendritic cells
80
Two signals are required for (3):
1. T cell activation 2. B cell activation 3. class switching
81
Naive T cell activation (4 steps)
1. Foreign body is phagocytosed by the dendritic cell. 2. Foreign Ag is presented on MHC II and recognized by TCR on Th (helper) cell. Ag is presented on MHC I to Tc (cytotoxic) cells. (signal 1) 3. Costimulatory signal is given by interaction of B7 and CD28. (signal 2) 4. Th cell activates and produces cytokines. Tc cell activates and is able to recognize/kill virus-infected cells.
82
B cell activation and class switching (4 steps)
1. Helper T cell activation 2. B cell receptor-mediated endocytosis; foreing antigen is presented on MHC II and recognized by TCR on Th cell (signal 1). 3. CD40 receptor on B cell binds CD40 ligand on Th cell (signal 2). 4. Th cell secretes cytokines that determine Ig class switching of B cell. B cell activates and undergoes class switching, affinity maturation, and antibody production.
83
Th1 cell secretes...
IFN-gamma.
84
Th1 cell activates...
macrophages and cytotoxic T lymphocytes.
85
Th1 cell is inhibited by...
IL-4 and IL-10 (from the Th2 cell).
86
Th2 cell secretes...
IL-4, IL-5, IL-6, and IL-13.
87
Th2 cell recruits...
eosinophils for parasite defense and promotes IgE production by B cells.
88
Th2 cell is inhibited by...
IFN-gamma (from the Th1 cell).
89
Macrophage-lymphocyte interaction
Macrophages release IL-12 which stimulates T cells to differentiate into Th1 cells. Th1 cells release IFN-gamma to stimulate macrophages.
90
Cytotoxic T cells kill..
virus-infected, neoplastic, and donor graft cells by inducing apoptosis.
91
Cytotoxic T cells release...
cytotoxic granules containing preformed proteins: 1. perforin that helps deliver content of granules into target cell 2. granzyme B = a serine protease that activates apoptosis inside a target cell 3. antimicrobial that induces apoptosis
92
Regulatory T cells help maintain specific immune tolerance by...
suppressing CD4 and CD8 T-cell effector functions.
93
Regulatory T cells are identified by expression of...
cell surface markers CD3, CD4, CD25 (alpha chain of IL-2 receptor) and transcription factor FOXP3.
94
The part of antibody that recognizes antigen is...
variable part of L and H chains.
95
Fc portion of IgM and IgG acts to...
fix complement.
96
Heavy chain contributes to...
Fc and Fab fractions.
97
Light chain contributes to...
Fab fraction only.
98
Fab is the...
antigen binding fragment.
99
Fab determines...
the idiotype: it is a unique antigen-binding pocket. Only 1 antigenic specificity is expressed per B cell.
100
Fc is the...
constant region with a carboxy terminal. It binds complement and has carbohydrate side chains.
101
Fc region determines...
isotype (IgM, IgD, etc.)
102
Antibody diversity is generated by (4):
1. random recombination of VJ (light chain) or VDJ (heavy chain) genes 2. random combination of heavy chains 3. somatic hypermutation (following Ag stimulation) 4. addition of nucleotides to DNA during recombination by terminal deoxynucleotidyl transferase
103
Mature lymphocytes express...
IgM and IgD on their surfaces.
104
Mature B lymphocytes may differentiate in...
germinal centers of LNs by isotype switching (gene rearrangement; mediated by cytokines and CD40 ligand) into plasma cells that secrete IgA, IgE or IgG.
105
IgG is the main antibody in...
secondary (delayed) response to an antigen. It is the most abundant isotype in the serum.
106
Actions of IgG
- fixes complement - crosses placenta to provide infants w/ passive immunity - opsonizes bacteria - neutralizes bacterial toxins and viruses
107
IgA prevents...
attachment of bacteria and viruses to the mucous membranes. It does NOT fix complement.
108
IgA crosses epithelial cells by...
transyctosis. It is a monomer in circulation and a dimer when secreted.
109
IgA is the most..
produced antibody overall but is released into secretions (tears, saliva, mucus) and early breast milk (colustrum).
110
IgA picks up a...
secretory component from epithelial cells before secretion.
111
IgM is produced in...
the primary (immediate) response to an antigen. It fixes complement but does not cross the placenta.
112
Antigen receptor for IgM is on...
surface of B cells.
113
Form of IgM
monomer on B cell or pentamer when secreted; the pentamer shape allows it to efficiently trap free Ags out of tissue while the humoral response evolves.
114
IgD is found...
on the surface of many B cells and in the serum.
115
IgE binds...
mast cells and basophils. Has the lowest concentration in serum.
116
When exposed to an allergen, IgE will..
cross-linke mediating immediate (type I) hypersensitivity through the release of inflammatory mediators such as histamine.
117
IgE mediates immunity to...
worms by activating eosinophils.
118
Thymus-independent antigens are...
antigens lacking a peptide component (ex. lipopolysaccharides from gram-negative bacteria).
119
Thymus-independent antigens cannot be...
presented by MHC to T cells. They are weakly or non-immunogenic.
120
Vaccines for thymus-independent antigens often require...
boosters. (ex. pneumococcal polysaccharide vaccine).
121
Thymus-dependent antigens are...
antigens containing a protein component (ex. diphtheria vaccine).
122
As a result of direct contact between B cells with thymus-dependent antigens and Th cells, there is...
class switching and immunologic memory.
123
Acute phase reactants are...
factors whose serum concentrations change significantly in response to inflammation.
124
Acute phase reactants are produced by the...
liver in both acute and chronic inflammatory states.
125
Acute phase reactants are induced by...
IL-6, IL-1, TNF-alpha and IFN-gamma.
126
Positive Acute phase reactants
- serum amyloid A - C-reactive protein - ferritin - fibrinogen - hepcidin
127
Negative acute phase reactants
- albumin | - transferrin
128
Serum amyloid A
prolonged elevation can lead to amyloidosis
129
C-reactive protein
opsonin; fixes complement and facilitates phagocytosis | measured clinically as a sign of ongoing inflammation
130
Ferritin
binds and sequesters iron to inhibit microbial iron scavenging
131
Fibrinogen
coagulation factor; promotes endothelial repair; correlates with ESR
132
Hepcidin
prevents release of iron bound by ferritin leading to anemia of chronic disease
133
Albumin
reduction during acute phase reaction acts to conserve amino acids for positive reactants
134
Transferrin is downregulated in the acute phase to be...
internalized by macrophages to sequester iron.
135
Complement is a system of...
interacting plasma proteins that play a role in innate immunity and inflammation. MAC defends against gram-negative bacteria.
136
Activation of the Complement pathways
Classic pathway - IgG or IgM mediated Alternative pathway - microbe surface molecules Lectin pathway - mannose or other sugars on microbe surface
137
Functions of complement
C3b - opsonization C3a, C4a, C5a - anaphylaxis C5a - neutrophil chemotaxis C5b-9 - cytolysis by membrane attack complex
138
The two primary opsonins in bacterial defense are...
C3b and IgG. C3b also helps clear immune complexes.
139
Complement activation on self cells is prevented by...
decay-accelerating factor (DAF aka CD55) and C1 esterase inhibitor.
140
C1 esterase inhibitor deficiency causes...
hereditary angioedema. ACE inhibitors are contraindicated.
141
C3 deficiency increases risk of...
severe, recurrent pyogenic sinus and respiratory tract infections. It increases susceptibility to type III HSRs.
142
C5-C9 deficiencies increase...
susceptibility to recurrent Neisseria bacteremia.
143
DAF deficiency causes...
complement-mediated lysis of RBCs and paroxysmal nocturnal hemoglobinuria.
144
Cytokines secreted by macrophages
``` IL-1 IL-6 IL-8 IL-12 TNF-alpha ```
145
IL-1 is an...
endogenous pyrogen (aka osteoclast-activating factor).
146
IL-1 causes...
fever and acute inflammation. It activated endothelium to express adhesion molecules and induces chemokine secretion to recruit leukocytes.
147
IL-6 is an...
endogenous pyrogen that causes fever and stimulates production of acute phase reactants.
148
IL-8 is the major...
chemotactic factor for neutrophils.
149
IL-12 induces...
differnetiation of T cells into Th1 cells and activates NK cells.
150
TNF-alpha mediates...
septic shock, activates the endothelium and causes leukocyte recruitment, vascular leak.
151
Cytokines secreted by all T cells
- IL-2 | - IL-3
152
IL-2 stimulates...
growth of helper, cytotoxic and regulatory T cells
153
IL-3 supports the...
growth and differentiation of bone marrow stem cells. It functions like GM-CSF.
154
Cytokine secreted by Th1 cells...
IFN-gamma.
155
IFN-gamma has...
antiviral and antitumor properties. IT activates NK cells to kill virus-infected cells. It increases MHC expression and antigen presentation in all cells.
156
Cytokines secreted from Th2 cells
IL-4 IL-5 IL-10
157
IL-4 induces...
differentiation into Th2 cells. It promotes growth of B cells and enhances class switching to IgE and IgM.
158
IL-5 promotes...
differentiation of B cells. It enhances class switching to IgA. Stimulates growth and differentiation of eosinophils.
159
IL-10 modulates...
inflammatory response. It inhibits the actions of activated T cells and Th1.
160
Interferon alpha and beta are a part of the...
innate host defense against both RNA and DNA viruses.
161
Interferons are...
glycoproteins synthesized by viral-infected cells that act locally on uninfected cells "priming" thme for viral defense.
162
When a virus infects a cell "primed" by interferons, the viral dsRNA activates:
1. RNAase L (leading to degradation of viral/host mRNA 2. protein kinase (leading to inhibition of viral/host protein synthesis) *This essentially results in apoptosis, thereby interrupting viral amplification.
163
T cell surface proteins
1. TCR (binds antigen-MHC complex) 2. CD3 (associated with TCR for signal transduction) 3. CD28 (binds B7 on APC)
164
Helper T cell surface proteins
CD4 | CD40 ligand
165
Cytotoxic T cell surface protein
CD8
166
B cells surface proteins
- Ig (binds antigens) - CD19, CD20, CD21 (receptor for EBV), CD40 - MHC II, B7
167
Macrophage surface proteins
- CD14, CD40 - MHC II, B7 - Fc and C3b receptors (enhanced phagocytosis)
168
NK cell surface proteins
- CD16 (binds Fc of IgG) | - CD56 (unique marker for NK)
169
Anergy is when...
self-reactive T cells become nonreactive without a costimulatory molecule.
170
Superantigens (from S. pyogenes and S. aureus) act to...
cross-link the beta region of the T-cell receptor to the MHC class II on APCs. They can activate any T cell leading to a massive release of cytokines.
171
Endotoxins/lipopolysaccharide (gram-negative bacteria) directly stimulate...
macrophages by binding to endotoxin receptor CD14; Th cells are not involved.
172
Classic examples of Antigenic variation (5)
1. Salmonella (2 flagellar variants) 2. Borrelia (relapsing fever) 3. Neisseria gonorrhae (pilus protein) 4. influenza virus (major shift, minor drift) 5. Trypanosomes (programmed rearrangement)
173
Some mechanisms for variation include...
DNA rearrangement and RNA segment reassortment.
174
Examples of passive immunity
- IgA in breast milk - maternal IgG crossing placenta - antitoxin - humanized monoclonal antibody
175
Examples of active immunity
natural infection vaccines toxoid
176
Pts are given preformed antibodies (passive immunity) after exposure to...
tetanus toxin, botulinum toxin, HBV or Rabies.
177
Combined passive and active immunizations can be given for...
hep B or rabies exposure.
178
Live attenuated vaccine
microorganism loses its pathogenicity but retains capacity for transient growth within the inoculated host. Mainly induces a cellular response.
179
Pros of live attenuated vaccine
induces strong, lifelong immunity
180
Cons of live attenuated vaccine
may revert to virulent form, often contraindicated in pregnancy and immune deficiency
181
Examples of live attenuated vaccine
- mumps - measles - rubella - polio (Sabin) - influenza (intranasal) - varicella - yellow fever
182
Inactivated or killed vaccine
pathogen is inactivated by heat or chemicals; maintaining epitope structure on surface Ag is important; humoral immunity is induced.
183
Pros of inactivated/killed vaccine
stable and safer than live vaccines
184
Cons of inactivated/killed vaccine
weaker immune response, boosters usually required
185
Examples of inactivated/killed vaccine
- cholera - hep A - polio (salk) - influenza (injection) - rabies
186
Type I Hypersensitivity is...
anaphylactic and atopic. Free antigen cross-links IgE on presensitized mast cells and basophils, triggering immediate release of vasoactive amines that act at postcapillary venules.
187
In Type I HSR, the rxn develops...
rapidly after Ag exposure because of preformed Ab. The delayed response follows due to production of arachidonic acid metabolites (leukotrienes).
188
Type I HSR test
skin test specific for IgE
189
Type II HSR is...
cytotoxic (antibody mediated) - IgM, IgG bind to fixed Ag on "enemy" cell, leading to cellular destruction.
190
3 mechanisms of Type II HSR
1. opsonization leading to phagocytosis or complement activation 2. complement-mediated lysis 3. antibody-dependnet cell-mediated cytotoxicity, usually due to NK cells or macrophages
191
In Type II HSR, antibody and complement lead to...
MAC.
192
Test for Type II HSR
direct and indirect Coombs
193
Direct Coombs
detects antibodies that have adhered to pt's RBCs | ex. test an Rh+ infant of an Rh- mother
194
Indirect Coombs
detects antibodies that can adhere to other RBCs | ex. test an Rh- woman for Rh+ antibodies
195
Type III HSR is...
immune complex - antigen-antibody (IgG) complexes activate complement which attracts neutrophils; neutrophils release lysosomal enzymes.
196
Serum sickness is...
an immune complex disease (type III) in which antibodies to the foreign proteins are produced (takes 5 days). IMmune complexes forma and are deposited in membranes where they fix complement (leading to tissue damage).
197
Most serum sickness is now caused by...
drugs acting as haptens. Fever, urticaria, arthralgias, proteinuria, lymphaadenopathy 5-10 days after exposure.
198
Arthus rxn is a...
local, subacute antibody-mediated HSR type III. Intradermal injection of antigen induces antibodies, which form antigen-antibody complexes in the skin.
199
Arthus rxn is characterized by...
edema, necrosis, and activation of complement.
200
Test for Arthus rxn (or Type III HSRs)
immunofluorescent staining
201
Type IV HSR is a...
delayed (T cell mediated) type. Sensitized T lymphocytes encoutner antigen and then release lymphokines which leads to macrophase activation. NO antibody involved.
202
Test of Type IV HSR
patch test, PPD
203
Examples of Type I HSR
1. anaphylaxis (bee sting, food/drug allergy) | 2. allergic/atopic disorders (rhinitis, hay fever, eczema, hives, asthma)
204
Presentation of Type I HSR
immediate, anaphylactic, atopic
205
Presentation of Type II HSR (8)
1. autoimmune hemolytic anemia 2. pernicious anemia 3. ITP 4. erythroblastosis fetalis 5. rheumatic fever 6. goodpasture syndrome 7. bullous pemphigoid 8. pemphigus vulgaris
206
Presentation of Type II HSR
disease tends to be specific to tissue or site where antigen is found
207
Type III HSR examples (5)
1. SLE 2. polyarteritis nodosa 3. poststreptococcal glomerulonephritis 4. serum sickness 5. arthus rxn
208
Type III HSR presentation
associated with vasculitits and systemic manifestations
209
Type IV HSR examples (5)
1. MS 2. Guillain-Barre 3. GVHD 4. PPD (test for TB) 5. Contact dermatitis (poison ivy, nickel allergy)
210
Allergic rxn to blood tranfusion pathogenesis
Typer I HSR against plasma proteins in transfused blood.
211
Allergic rxn to blood transfusion presentation
urticaria, pruritis, wheezing, fever. Treat with antihistamines.
212
Anaphylactic rxn to blood transfusion pathogenesis
severe allergic rxn; IgA-deficient individuals must receive blood products that lack IgA
213
Anaphylactic rxn to blood transfusion presentation
dyspnea, bronchospasm, hypotension, respiratory arrest, shock
214
Febrile nonhemolytic transfusion rxn pathogenesis
Type II HSR. Host antibodies agaisnt donor HLA Ags and leukocytes.
215
Febrile nonhemolytic transfusion rxn presentation
fever, HAs, chills, flushing
216
Acute hemolytic transfusion rxn pathogenesis
Type II HSR. Intravascular hemolysis (ABO blood group incompatibility) or extravascular hemolysis (host Ab rxn against foreign antigen on donor RBCs).
217
Acute hemolytic trasnfusion rxn presentation
fever, hypotension, tachypnea, tachycardia, flank pain, hemoglobinemia (intravascular), and jaundice (extravascular hemolysis).
218
Anti-Ach receptor
myasthenia gravis
219
Anti-basement membrane
goodpasture syndrome
220
anti-cardiolipin, lupus antigocagulant
SLE, antiphospholipid syndrome
221
anticentromere
limited sclerosderma (CREST syndrome)
222
anti-desmoglein
pemphigus vulgaris
223
Anti-dsDNA, anti-Smith
SLE
224
anti-glutamate decarboxylase
T1DM
225
anti-hemidesmosome
bullous pemphigoid
226
antihistone
drug-induced lupus
227
anti-Jo-1, anti-SRP, anti-Mi-2
polymyositis, dermatomyositis
228
antimicrosomal, antithyroglobulin
Hashimoto thyroiditis
229
antimitochondrial
primary biliary cirrhosis
230
antinuclear antibodies
SLE (nonspecific)
231
anti-Scl-70 (anti-DNA topoisomerase I)
scleroderma (diffuse)
232
anti-smooth muscle
autoimmune hepatitis
233
anti-SSA, anti-SSB (anti-Ro, anti-La)
Sjogren syndrome
234
Anti-TSH receptor
graves
235
Anti-U1 RNP (ribonucleoprotein)
mixed CT disease
236
c-ANCA (PR3-ANCA)
granulomatosis with polyangiitis (Wegener)
237
IgA antiendomysial, IgA anti-tissue transglutaminase
celiac disease
238
p-ANCA (MPO-ANCA)
microscopic polyangiitis, Churg-Strauss
239
Rheumatoid factor (antibody, most commonly IgM, specific to IgG Fc region), anti-CCP
Rheumatoid arthritis
240
Patients with no T cells are susceptible to bacterial...
sepsis.
241
Pts with no T cells viral susceptibility
``` CMV EBV JCV VZV chronic infx with respiratory/GI viruses ```
242
PTs with no T cells fungal/parasitic susceptibility
Candida, PCP
243
Pts with No B cells bacterial susceptibility
Encapsulated bacteria
244
Pts with No B cells viral susceptibility
Enteroviral encephalitis, poliovirus (live vaccine contraindicated)
245
Pts with No B cells fungal/parasitic susceptibility
Giardia (no IgA)
246
Pts w/ no granulocytes bacterial susceptibilty
Staph Burkholderia cepacia Serratia Nocardia
247
Pts with no granulocytes fungal/parasitic susceptibility
Candida | Aspergillus
248
Pts with no complement bacterial susceptibility
Neisseria (no MAC)
249
B-cell deficiencies are tend to produce...
recurrent bacteiral infxns while T-cell deficiencies tend to produce more fungal and viral infections.
250
X-linked (Bruton) agammaglobulinemia defect
Defect in BTK, a tyrosine kinase gene leading to no B cell maturation.
251
X-linked agammaglobulinemia presentation
recurrent bacterial and enteroviral infxns after 6 months (decreased maternal IgG).
252
Findings of X-linked agammaglobulinemia
- normal CD19+ B cell count - decreased pro-B - decreased Ig of all classes - absent LNs and tonsils
253
Selective IgA deficiency presentaiton
- usually asymptomatic - can see airway and GI infections - autoimmune disease - atopy - anaphylaxis to IgA-containing products
254
Findings of IgA deficiency
-IgA
255
Common variable immunodeficiency defect
defect in B-cell differentiation
256
Common variable immunodeficiency presentation
-can be acquired in 20-30s; increased risk of autoimmune disease, bronchiechtasis, lymphoma, sinopulmonary infxns
257
Findings of common variable immunodeficieincy
- decreased plasma cells | - decreased immunoglobulins
258
DiGeorge syndrome (Thymic aplasia) defect
- 22q11 deletion | - failure to develop 3rd and 4th pharyngeal pouches (leading to an absent thymus and parathyroids)
259
Digeorge Syndrome presentation
- tetany (hypocalcemia) - recurrent viral/fungal infxns (T-cell deficiency) - conotruncal abnormalities (tetralogy of fallot and truncus arteriorsus)
260
Findings of DiGeorge
- decreased T cells - decreased PTH - decreased calcium - absent thymic shadow on CXR - 22q11 deletion detected by FISH
261
IL-12 recptor deficiency defect
decreased Th1 response; autosomal recessive
262
IL-12 receptor deficiency presentation
disseminated mycobacteiral and fungal infxns; may present after administration of BCG vaccine
263
Findings of IL-12 receptor deficiency
decreased IFN-gamma
264
Autosomal dominant hyper-IgE syndrome (Job syndrome) defect
-deficiency of Th17 cells due to STAT3 mutation leading to impaired recrutiment of neutrophils to the site of infxn
265
Autosomal dominant hyper-IgE syndrome presentation
- coarse Facies - cold staphylococcal abscesses - retained primary teeth - dermatolgic problems (eczema)
266
Findings of autosomal dominant hyper-IgE syndrome
- increased IgE | - decreased IFN-gamma
267
Chronic mucocutaneous candidiasis defect
T-cell dysfunction
268
Chronic mucocutaneous candidiasis presnetation
noninvasive candida infections of the skin and mucous membranes
269
Findings of chronic mucocutaneous candidiasis
- absent invitro T-cell proliferation in response to candida | - absent cutaneous rxn to candida antigens
270
Severe combined immunodeficiency (SCID) defect
several types including defective IL-2R gamma chain (most common, X-linked), adenosine deaminase deficiency (autosomal recessive)
271
SCID presentation
- FTT - diarrhea - thrush - recurrent viral, bacterial, fungal and protzoal infxns
272
SCID treatment
bone marrow transplant
273
Findings of SCID
- decreased T cell receptor excision circles (TRECs) - absense of thymic shadow - absence of germinal centers (LN biopsy) - absence of T cells (flow cytometry)
274
Ataxia-telangiectasia defect
defects in ATM gene leading to DNA double strand breaks leading to cell cycle arrest
275
Ataxia-telangiectasia presentation
``` cerebellar defects (ataxia) spider angiomas (telangiectasia) IgA deficiency ```
276
Ataxia-telangiectasia findings
- increased AFP - decreased IgA, IgG, IgE - lymphopenia - cerebellar atrophy
277
Hyper-IgM syndrome defect
most commonly due to defective CD40L on Th cells (class switching defect); X-linked
278
Presentation of Hyper-IgM syndrome
severe pyogenic infections early in life; opportunistic infxn with Pneumocystis, Cryptosporidium, CMV.
279
Findings of Hyper-IgM syndrome
- increased IgM | - decreased IgG, IgA, IgE
280
Wiskott-Aldrich syndrome defect
- mutation in WAS gene (x-linked recessive) | - T cells unable to reorganize actin skeleton
281
Presentation of Wiskott-Aldrich
- Thrombocytopeic purpura - eczema (esp. trunk) - recurrent infections - increased risk of atuoimmune disease and malignancy
282
Findings of Wiskott-Alrdrich
- decreased/normal IgG, IgM - increased IgE, IgA - fewre and smaller platelets
283
Leukocyte adhesion deficiency (LAD) type I Defect
defect in LFA-1 integrin (CD18) protein on phagocytes; impaired migration and chemotaxis; AR
284
LAD type I presentation
recurrent bacterial skin and mucosal infections, absent pus formation, impaired wound healing, delayed separation of umbilical cord
285
LAD type I findings
- increased neutrophils | - absence of neutrophils at infection sites
286
Chediak-Higashi syndrome defect
defect in lysosomal trafficking regulator gene (LYST). Microtubule dysfunction in phagosome-lysosome fusion; AR
287
Chekiak-Higashi syndrome presentation
recurrent pyogenic infxns by staph and strep, partial albinism, peripheral neuropathy, progressive neurodegeneration, infiltrative lymphohistiocytosis
288
Chediak-higashi findings
- giant granules in neutrophils and platelets - pancytopenia - mild coagulation defects
289
Chronic granulomatous disease defect
defect of NADPH oxidase leading to decreased ROS and absent respiratory burst in neutrophils; X-linked
290
Chronic granulomatous disease presentation
increased susceptiblity to catalase positive organisms
291
Findings of chronic granulomatous disease
- abnormal dihydrorhodamine test | - nitroblue tetrazolium dye reduction test is negative
292
Hyperacute (w/i minutes) transplant rejection pathogenesis
pre-existing recipient antibodies react to donor antigen (type II HSR) and activate complement
293
Hyper acute rejection features
widespread thrombosis of graft vessesl leading to ischemia/necrosis. (graft must be removed)
294
Acute rejection (wks to months) pathogenesis
Cellular: CTLs activated against donor MHCs Humoral: similar to hyperacute, excpt antibodies develop after transplant
295
Acute rejection features
- vasculitis of graft vessels with dense interstitial lymphocytic infiltrate - prevent/reverse with immunosuppressants
296
Chronic (months to years) rejection pathogenesis
recipient T cells perceive donor MHC as recipient MHC and react against donor antigens presented; both cellular and humoral components
297
Chronic rejection features
- irreversible; t-cell and antibody mediated damage - Heart: atherosclerosis - Lungs: bronchiolitis obliterans - Liver: vanishing bile ducts - Kidney: vascular fibrosis, glomerulopathy
298
GVHD pathogenesis
grafted immunocompetent T cells proliferate in the immunocompromised host and reject host cells with "foreign" proteins leading to severe organ dysfunction
299
Features of GVHD
- maculopapular rash, jaundie, diarrhea, hepatosplenomegaly - usually in bone marrow and liver transplants (rich in lymphocytes) - potentially beneficial in BMT for leukemia (graft vs. tumor)
300
Cyclosporine MOA
calcineurin inhibitor; binds cyclphilin; blocks T-cell activation by preventing IL-2 transcription
301
Use of cyclosporine
transplant rejection prophylaxis psoriasis RA
302
Toxicity of Cyclosporine
- Nephrotoxicity** - HTN - hyperlipidemia - hyperglycemia - tremor - hirsutism - gingival hyperplasia
303
Tacrolimus MOA
calcineurin inhibitor; binds FK506 binding protein; blocks T cell activation by preventing IL-2 transcription
304
Use of Tacrolimus
transplant rejection prophylaxis
305
Toxicity of Tacrolimus
- increased risk of diabetes and neurotoxicity | - nephrotoxic**
306
Sirolimus MOA
mTOR inhibitor; binds FKBP | blocks T cell activation and B cell differentiation by preventing IL-2 signal transduction
307
Use of Sirolimus
kidney transplant rejection prophylaxis
308
Toxicity of Sirolimus
- anemia - thrombocytopenia - leukiopenia - insulin resistance - hyperlipidemia - NON-nephrotoxic
309
Basiliximab MOA
monoclonal antibody; blocks IL-2R
310
Basiliximab Use
kidney transplant rejection prophylaxis
311
Basiliximab Toxicity
edema HTN tremor
312
Azathioprine MOA
antimetabolite precursor of 6-MP; inhibits lymphocyte proliferation by blocking nucleotide synthesis
313
Azathioprine use
- transplant rejection prophylaxis - RA - Crohn disease - glomerulonephritis
314
Azathioprine toxicity
- leukopenia - anemia - thrombocytopenia
315
Glucocorticoids MOA
inhibit NF-kappaB; suppress both B and T cell fxn by decreasing transcription of many cytokines
316
Use of Glucocorticoids
- transplant rejection prophylaxis (immune suppression) | - inflammation
317
Toxicity of Glucocorticoid
- hyperglycemia - osteoporosis - central obesity - muscle breakdown - psychosis - acne - HTN - cataracts - peptic ulcers
318
Glucocorticoids can cause iatrogenic...
Cushing Syndrome.
319
Epoeitin alfa (erythropoietin) is used for...
anemias esp. in renal failure.
320
Thrombopoietin is used in...
thrombocytopenia.
321
Oprelvekin (IL-11) is used in...
thrombocytopenia.
322
Filgrastim (granulocyte colony-stimulating-factor) is used in...
recovery of bone marrow.
323
Sagramostim (granulocyte-macrophage colongy-stimulating factor) is used in...
recovery of bone marrow.
324
Aldesleukin (IL-2) is used in...
renal cell carcinoma and metastatic melanoma.
325
IFN-alpha is used in...
Hep B/C, Kaposi sarcoma, hairy cell leukemia, condyloma acuminatum, RCC, and malignant melanoma
326
IFN-beta is used in..
MS.
327
IFN-gamma is used in...
chronic granulomatous disease
328
Alemtuzumab targets...
CD52 and is used for CLL.
329
Bevacizumab targets...
VEGF and is used in colorectal cancer and RCC.
330
Cetuximab targets...
EGFR and is used in Stage IV colorectal cancer and head/neck cancer.
331
Rituximab targets...
CD20 and is used in B-cell non-hodgkin lymphoma, RA, and ITP
332
Trastuzumab targets...
HER2/neu and is used in breast cancer and gastric cancer.
333
Infliximab and adalimumab target...
TNF-alpha and are used in IBD, RA, ankylosing spondyliits and psoriasis.
334
Natalizumab targets...
alpha4-integrin and is used in MS and Crohn disease.
335
Abciximab targets...
glycoprotein IIb/IIIa and is used as an anti-platelet agent for prevention of ischemic complications in pts undergoing percutaneous coronary intervention.
336
Denosumab targets...
RANKL and is used in osteoporosis to inhibit osteoclast maturation.
337
Digoxin immune Fab targets...
digoxin and is used for digoxin toxicity.
338
Omalizumab targets...
IgE and is used for allergic asthma; it prevents IgE binding to FcepsilonRI.
339
Palvizumab targets...
RSV F protein and is used for RSV prophylaxis for high-risk infants.