cellular and molecular immunology 8th edition abbas test bank
cellular and molecular immunology 8th edition abbas
cellular and molecular immunology 8th edition
cellular and molecular immunology
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CELLULAR AND MOLECULAR IMMUNOLOGY 8TH EDITION ABBAS TEST BANK
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Cellular and Molecular Immunology 8th
Edition Abbas Test Bank
Abbas: Cellular and Molecular Immunology, 8th Edition
Activation of T Lymphocytes
Test Bank
Multiple Choice
1. All of the following protein-protein interactions are involved in activation of naive
helper T cells by antigen-presenting cells (APCs) EXCEPT binding of:
A. Peptide-MHC complexes on the APC to the TCR on the T cell
B. CD4 on the T cell to nonpolymorphic regions of class II MHC molecules on the
APC
C. Integrins on the T cell with adhesion ligands on the APC
D. B7-2 on the APC with CD28 on the T cell
E. CD40L on the T cell with CD40 on the APC
ANS: E. CD40L is not expressed on naive T cells and is only up-regulated subsequent to
activation by an antigen-presenting cell (APC). In the naive helper T cell, the TCR binds
to the MHC-peptide complex whereas the CD4 coreceptor engages a conserved region on
the MHC II molecule. Integrins on the T cell interact with adhesion ligands on the APC.
This region of binding between the T cell and the APC is known as the immunologic
synapse and also includes costimulatory interactions, such as CD28 on the T cell binding
to B7 on the APC.
2. Which one of the following statements about MHC-TCR interactions is NOT true?
A. Antigen receptors on T cells bind to MHC molecules for only brief periods of
time.
B. The affinity of most TCRs for peptide-MHC complexes is similar to the affinity
of antibodies for their antigens.
C. Only 1% or less of the MHC molecules on any antigen-presenting cell (APC)
display a peptide recognized by a particular T cell.
D. T cells usually require multiple engagements with an APC before a threshold of
activation is reached.
E. A subthreshold number of MHC-TCR interactions can lead to T cell inactivation.
ANS: B. In general, the TCR binds to peptide-MHC complexes with lower affinity than
antigen-antibody interactions. This relatively low-affinity interaction occurs briefly; thus,
a T cell may need multiple engagements with the antigen-presenting cell (APC) before a
threshold of activation occurs. If this threshold is not reached, the T cell may enter into an
inactive state known as anergy. On any given APC, less than 1% of the MHC molecules
display the same peptide.
Matching
,Questions 3-10
For each of the descriptions in questions 3-10, choose the T cell signaling molecule that
best matches it from the list below (A-O).
A. CD3
B. Lck
C. Zap-70
D. LAT
E. Ras
F. PLC
G. PIP2
H. PIP3
I. IP3
J. DAG
K. Calcineurin
L. NFAT
M. Jun
N. Fos
O. NF-B
3. This molecule becomes an active transcription factor on dephosphorylation.
ANS: L. NFAT is a transcription factor required by T cells for the expression of
interleukin (IL)-2, IL-4, tumor necrosis factor (TNF), and other cytokine genes. NFAT is
present in an inactive, phospN hoUryRlS
ateIdNG rmB.
foT inCO
thM
e cytosol of resting T cells. On
dephosphorylation by calcineurin, a nuclear localization sequence is uncovered that
permits NFAT to translocate to the nucleus. Once in the nucleus, NFAT induces
transcription of these genes.
4. This protein is a well-characterized proto-oncogene product that on mutation to a
constitutively active form has been associated with multiple neoplasms.
ANS: E. Ras was one of the first proto-oncogenes characterized. Normal ras is involved
in TCR signaling pathways. On mutation to a constitutively active state, ras promotes the
survival and proliferation of malignant cells.
5. Binding of this molecule to Jun is needed for transcriptional activation of the IL-2
gene.
ANS: N. Fos combines with phosphorylated Jun to form activation protein-1 (AP-1). AP-
1 is the name for a family of DNA-binding factors composed of dimers of two different
proteins. Transcription of fos is enhanced by the Erk pathway, whereas phosphorylation
of preexisting Jun is induced through the Vav/Rac pathway. AP-1 physically associates
with other transcription factors in the nucleus, and together they activate transcription of
cytokine genes essential for T cell activation.
6. This is a transcription factor that exists in the phosphorylated form within the nucleus.
,Test Bank 3
ANS: M. On phosphorylation, c-Jun translocates to the nucleus and binds to Fos to form
AP-1.
7. Immunosuppressive therapy with the drugs cyclosporine and FK506 inhibits T cell
activation by blocking the protein phosphatase activity of this molecule.
ANS: K. Calcineurin is responsible for the dephosphorylation of NFAT, which is an
essential transcription factor for the activation of T and B cells. The immunosuppressive
drugs cyclosporine and FK506 function by inhibiting calcineurin. These drugs are
commonly used to prevent transplant rejection.
8. This molecule binds to a receptor on the endoplasmic reticulum and stimulates release
of calcium into the cytosol.
ANS: I. IP3 is generated from the cleavage of PIP2 in the membrane to DAG and IP3 by
the enzyme PLC, and it stimulates release of calcium into the cytosol.
9. This molecule has the same downstream effect as addition of the drug phorbol
myristate acetate (PMA) to T cells.
ANS: J. Both DAG and pharmacologic agents such as phorbol myristate acetate (PMA)
activate protein kinase C (PKC). PKC has many substrates and is a potent activator of
many transcription factors in T cells.
10. This molecule is a transcriN ioR
ptU nSfaI orGiT
ctN nvBo.
lvC
edOM
in the expression of several T cell
activation genes activated when its bound inhibitor is phosphorylated.
ANS: O. NF-B is present in the cytoplasm and is bound to an inhibitor called I-B. On
stimulation with antigen, I-B becomes phosphorylated, dissociates from NF-B, and is
degraded by the ubiquitin-proteosomal pathway. NF-B then translocates to the nucleus,
where it participates in transcriptional activation of several genes.
, Abbas: Cellular and Molecular Immunology, 8th Edition
Antibodies and Antigens
Test Bank
Matching
Questions 1-5
Match each of the descriptions in questions 1-5 with the correct lettered antibody isotype
(A-E). (Answers may be used more than once.)
A. IgA
B. IgD
C. IgE
D. IgG
E. IgM
1. The secreted form of this isotype forms pentamers around a J chain
ANS: E. IgM is secreted as a J chain–linked pentamer.
2. The most abundant Ig isotype in the blood
ANS: D. The blood IgG concentration is about 3.5 mg/mL and includes four subtypes
(IgG1 to IgG4).
3. The isotype only found in membrane-bound form on naive B cells
ANS: B. IgD is not secreted and is found only on the surface of naive B cells. Its function
is not well understood.
4. The isotype found predominantly in mucosal secretions
ANS: A. IgA accounts for almost two thirds of the 3 g of antibody produced each day by
an adult, most of which is produced in the gastrointestinal mucosa.
5. The isotype most closely associated with immediate hypersensitivity (allergic)
disease
ANS: C. Most IgE that is secreted is bound to mast cells, and it plays a role in the
activation of mast cells during allergic reactions.
Questions 6-10
Match each description in questions 6-10 with the appropriate lettered term (A-I).
A. Conformational determinant
B. Linear determinant
C. Neoantigenic determinant
D. Hinge region
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