Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Immunology > Antibody Mediated Immune Response > Flashcards

Antibody Mediated Immune Response Flashcards

(57 cards)

Start Studying
1
Q

Ig rearrangement occurs where?

A

bone marrow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the main Ag receptor isotype of the surface of most peripheral B cells?

A

IgD often co-expressed with IgM

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Some children with periodic fever have increased levels of what?

A

IgD

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Before a B cell can leave the bone marrow it must undergo what?

A

central tolerance or negative selection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

negative selection prevents what?

A

the development of autoimmunity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

the second mechanism for preventing recognition of self-ags?

A

receptor editing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

receptor editing consists of?

A

reactivation of Ig gene recombination and expresses new light chain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Activation of B cells by Ag in the lymph node initiates what process:

A
  1. B cell proliferation
  2. B cell increases expression of: Ag (MHC class II), B7 (CD80/CD86), receptors for cytokines produced by Th cell
  3. Secrete low levels of IgM
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Where do Ag-activated B cells migrate to within the lymph node?

A

from lymphoid follicle to T cell rich zones of lymph node

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Which part of complement is very important at the beginning of infection when amount of microbial Ag is limited?

A

CR2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what does CR2 bind?

A

C3d, a fragment of C3b deposited on bacteria

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

CR2 does what to B cells?

A

makes B cell very sensitive to Ags

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

CR2 helping B cells helps to illustrate what concept of immune system?

A

cooperation between innate and adaptive immunity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Ags are processed and peptides produced are presented on what of B cells?

A

class II MHC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

T cells activate B cells through?

A

direct contact and cytokines

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

CD40 is expressed on which cell?

A

B cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

CD40L is expressed on what cell?

A

T helper cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What must happen with BCRs for the B cell to be activated?

A

cross-linked

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

what does activation of the B cells result in?

A

proliferation, initial antibody production, germinal center reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

what is the first antibody produced by B cells?

A

IgM

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Ab class is determined by which region?

A

Fc region of heavy chain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

During B cell maturation it can switch to produce what?

A

IgG, IgA, or IgE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Principal effector function of IgA

Study These Flashcards
A

mucosal immunity

24
Q

Principal effector function of IgG subclasses (IgG1, IgG3)

Study These Flashcards
A

Fc-dependent phagocyte responses; complement activation; neonatal immunity (placental transfer)

25
Principal effector function of IgM
complement activation
26
Principal effector function of IgE
immunity against helminths (eosinophil-mediated); mast cell degranulation (immediate hypersensitivity)
27
Mechanism of Ig class switching?
intrachromosomal recombination within G-rich tandem repeated DNA sequences called S (switch) regions located upstream of heavy chain constant region genes (except C-delta)
28
High rate of mutation of VDJ gene segments is referred to as?
somatic hypermutation
29
Where does somatic hypermutation mutate?
part of rearranged gene that encodes Ag-binding domain
30
Somatic hypermutation creates B cells with BCRs?
with higher affinity or stimulated more easily because they get Ag first
31
B cells with higher affinity proliferate...?
more robust than lower affinity receptors
32
Result of somatic hypermutation?
more B cells with higher affinity of BCR for Ag
33
B cells can become what?
plasma cell or memory cell
34
plasma cells travel where?
spleen or back to bone marrow
35
plasma cells live about how long?
5 days
36
Memory seems to be only activated when?
CD40-CD40L interaction occurs
37
Thymus-dependent antigen chemical nature?
proteins
38
Thymus-independent antigen chemical nature?
polymeric antigens, esp. polysaccharrides, glycolipids, nucleic acids
39
Does isotype switching occur with thymus-dependent antigens?
Yes
40
Does isotype switching occur with thymus-independent antigens?
little or no (may be some IgG)
41
Do antibodies of thymus-dependent antigens have affinity maturation?
yes
42
do antibodies of thymus-independent Ags produce secondary response (memory B cells)?
Only seen with some antigens
43
What are 3 properties of Thymus-independent Ags?
1. polymeric structure 2. resistance to degradation (persist for long periods of time and continue to stimulate the immune system) 3. polyclonal activation of B cells
44
What do TI-Ags do to B cells?
cross-link many BCRs
45
TI-1 Ags are?
polyclonal activators of B cells
46
What kinds of molecules are normally TI-Ags?
Usually polysaccharide lipids and other nonprotein Ags
47
TI-2 Ags are?
(not polyclonal) are Ags with repeating epitopes for cross-linking BCRs
48
TI-1 Ags signaling?
1: BCR binds Ag 2: TLR * no CD4 cell help may be non-specific (e.g. such as LPS)
49
TI-2 Ags signaling?
1: BCR binds Ag 2: clustering of BCRs * no CD4 cell help
50
TI-2 Ag immune responses
generated against repetitive Ags
51
B cells activated with TI-2 Ags by?
direct BCR cross-linking
52
Does TI-2 Ag immune response produce memory?
no
53
For TI-2 Ags what kind of Ab produced?
mostly IgM
54
Abs produced in response to TI-2 Ags had what kind of affinity?
relative low
55
What kind of belong to TI Ags?
many bacterial cell wall polysaccharides
56
What are the advantages of TI-Ags?
B cells can be activated right away without T cells activated
57
Patients with congenital or acquired deficiencies of Ab-mediated response are susceptible to infections of what?
encapsulated bacteria

Immunology (13 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions