Mixed Flashcards
the condition of being resistant to infection
Immunity
Study of a host’s reaction when foreign substances(antigens) are introduced into the body
Immunology
Where cells developed and matured
Primary lymphoid organs
2 primary lymphoid organs
Bone Marrow
Thymus
Organs that process the antigens for attack
Secondary lymphoid organs
Secondary lymphoid organs are
Spleen, lymph nodes, tonsils, appendix, peyer’s patches(intestine),MALT
2 branches of immunity
Natural/Innate
Acquired/Adaptive/Specific
type of immunity that is present at birth
Natural/Innate Immunity
Immunity that is not antigen specific and no memory
Natural/Innate Immunity
Immunity that is absent at birth and acquired through exposure
Acquired/Adaptive/Specific Immunity
Immunity that is antigen specific and with memory
Acquired/Adaptive/Specific Immunity
2 parts of Natural/Innate Immunity
External defense
Internal defense
Intact skin, mucous membranes, body fluids, normal flora
External defense
WBCs, inflammation, phagocytosis
Internal defense
2 types of Acquired/Adaptive/Specific Immunity
Cell-mediated Immunity
Humoral-Mediated Immunity
Immunity that is mediated by T cells
Cell-mediated Immunity
Immunity that is mediated by B cells
Humoral-Mediated Immunity
bacterial infection, phagocytosis and respiratory burst
neutrophils
parasitic and helminthic infection, neutralization of basophil and mast cells products
eosinophil
hypersensitivity reactions, release histamines in blood
basophils
hypersensitivity reactions, connective tissue cell in tissue
mast cells
phagocytosis, migrate to tissues to become macrophages
monocytes
phagocytosis, elimination of bacteria, intracellular parasites, tumor cells, secretion of cell mediators, ag presentation
macrophages
phagocytosis, presentation of antigen to helper T cells in blood and lymph organs
Dendritic cells
cell mediated immunity
derived from cells in the bone marrow
mature and differentiate in thymus
T lymphocytes
60 to 80 % of lymphocytes
T lymphocytes
humoral mediated immunity
developed in the bone marrow
Have surface Igs (IgM, IgD) that act as receptors for ag
B lymphocytes
10 to 20% of lymphocytes
B lymphocytes
1st line of defense against tumor cells & cells infected with viruses
NK cells
without T and B markers
NK cells
CD16 & CD56
NK Cells
bridge between innate & acquired immunity
NK cells
<20% of lymphocytes
NK cells
Normal CD4:CD8 ratio
2:1
Cytotoxic T cells & suppresor T cell
CD8 T cells
Helper T cells, Regulatory T cells, Delayed type hypersensitivity cells
CD4 T cells
Thymus dependent
T cells
Thymus independent
B cells
Type of Activated B cells
Plasma cells or Memory cells
type of B lymphocytes that produce antibodies
Plasma cells or Memory cells
Types of Acquired Immunity
Active
Passive
Type of Acquired immunity made by oneself
Active Acquired Immunity
Type of Acquired immunity which is from other host
passive acquired immunity
Antigenic Exposure/Infection
Natural Active Acquired Immunity
Vaccination (Ag)
Artificial Active Acquired immunity
Natural passive acquired immunity
IgG - only can transfer to placenta
IgA - colustrum
vaccination of immune serum
Artificial passive acquired immunity
defense against viruses, fungi, mycobacteria, other intracellular pathogens, tumor cells
Cell mediated Immunity
Involves T lymphocytes, macrophages
cell mediated immunity
examples of cell mediated immunity
Graft rejection
hypersensitivity reaction
elimination of tumor cells
MCH 1
CD8
MCH 2
CD4
Defense against bacteria(extracellular)
Humoral mediated immunity
involves B lymphocytes, plasma cells
humoral mediated immunity
example of humoral mediated immunity
Antibody production
Substances recognized as foreign by the body and have the capability to react with a complementary antibody or cell receptor
Antigen
an antigen that induces an antibody and reacts specifically with it
Homologous antigen
an antigen that reacts with an antibody it did not induce cross reaction
Heterologous antigen
glycoprotein substances developed by PLASMA CELLS in response to the presence of antigens
Antibodies
basic structure of antibodies
2 heavy chains and 2 light chains held together by disulfide bonds
2 types of light chains
kappa
lambda
normal ratio of Kappa:Lambda in serum
2:1
5 types of heavy chains
mu gamma alpha delta epsilon
4 types of hypersensitivity reactions
Type I - Allergic/Anaphylactic
Type II - Cytotoxic
Type III - Immune Complex
Type IV - Delayed Type
most severe type of hypersensitivity reaction
Type I or allergic/anaphylactic
examples of type I hypersensitivity reaction
Bronchial asthma
Hay fever
Urticaria
Food allergies
type of hypersensitivity reaction that involves HEMOLYSIS
Type II - Cytotoxic
Ab or Cells involved in type I hypersensitivity
IgE
Ab or Cells involved in type II hypersensitivity
IgM, IgG + complement
type of complement pathway that starts with the C1 activation
Classical pathway
type of complement pathway activated by IgM and IgG
Classical pathway
C3b
opsonin
C5a,C3a,C4a
anaphylatoxin
most virulent anaphylatoxin
C5a
C5a is a
chemotoxin
type of hypersensitivity reaction that involves autoimmune diseases
Type III - immune complexes
examples of type II hypersensitivity
HTR, HDN, ITP and Some drug allergies
Ab or Cells involved in type III hypersensitivity
IgM, IgG + complement
examples of type III hypersensitivity
Immune glomerulonephritis
serum sickness
arthus reaction
Type I, II, III hypersensitivity reactions are involved in what kind of immunity
Humoral-mediated immunity
Ab or Cells involved in type IV hypersensitivity
T cells (CD4+, T cells delayed)
examples of type IV hypersensitivity
Tuberculin skin test
Contact dermatitis
C3 convertase in Classical Pathway
C4b2a
C5 convertase in Classical Pathway
C4b2a3b
Membrane Attack Complex in Classical and Alternative pathway
C5b6789
Type of complement pathway that is activated by polysaccharide and lipopolysaccharide
Alternative pathway
Type of complement pathway that is activated by bind of MBL to mannose found in bacteria
Lectin pathway
type of complement pathway that is very similar to classical pathway
Lectin pathway
C3 convertase in Alternative Pathway
C3bBb
C5 convertase in Alternative Pathway
C3bBb3b
IGRAs is also known as
Interferon-Gamma Release Assay
WB test that can aid in the diagnosis of M.tuberculosis infection
IGRAs / Interferon-Gamma Release Assay
measure a person’s immune reactivity to M.tuberculosis
IGRAs
2 types of IGRAs
QuantiFERON - TB Gold In-Tube test (QFT-GIT)
T-SPOT TB test (T-Spot)
5 classes of Immunoglobulins
IgG IgA IgM IgD IgE
predominant immunoglobulin
IgG
immunoglobulin produced in secondary(anamnestic) ab response
IgG
4 subclasses of IgG
IgG1
IgG2
IgG3
IgG4
Most clinically significant IgG subclasses are
IgG1
IgG3
IgG exist as
monomer
IgM exist as
pentamer
IgA in serum exists as
monomer
IgA in body secretions exists as
dimer
Binds complement, has roles in oponization and ab-dependent cellular cytotoxicity, neutralizes toxins
IgG
predominant immunoglobulin in secretions
IgA
Only immunoglobulin that can cross the placenta barrier
IgG
1st antibody produced against an immunogen
IgM
produced during Primary immune response
IgM
Best activator of the classical pathway of complement
IgM
Immunoglobulin with unknown function
IgD
immunoglobulin primarily a cell membrane surface component of B-lymphocytes
IgD
Immunoglobulins that exist as monomer
IgG
IgA in serum
IgD
IgE
immunoglobulin elevated during parasitic infections and Type I allergic reactions
IgE