1.2 (Quiz 1) Flashcards
microorganisms so highly pathogenic that they generally produce disease whenever they enter the host
Obligate pathogens
“Party Crashers”
Bacteria are (prokaryotes or eukaryotes)
prokaryotes
Fungi are (prokaryotes or eukaryotes)
eukaryotes
parasites are (prokaryotes or eukaryotes)
eukaryotes
___ are not cells and need the machinery of another living cell (either eukaryotic or prokaryotic) in order to replicate
Viruses
Very clearly non-self (Innate or adaptive recognition)
Innate recognition
PAMPs
Pathogen associated molecular patterns
Pathogen associated molecular patterns (PAMPs), (Innate or adaptive recognition)
Innate recognition
Evolutionarily conserved structures on pathogens that are recognized by the ___ immune system
innate
PRRs
Pattern recognition receptors
Recognized by Pattern recognition receptors (PRRs), (Innate or adaptive recognition)
Innate recognition
More specifically non-self (Innate or adaptive recognition)
adaptive recognition
Specific molecule segments, conformations, or sequences (Innate or adaptive recognition)
adaptive recognition
Recognized by T-cell receptors if presented on MHC or B-cell receptors if extracellular (Innate or adaptive recognition)
adaptive recognition
plasma cell precursor
B lymphocytes
effector T cell precursor
T lymphocytes
epithelial barrier immune system (innate or adaptive)
innate
mast cells immune system (innate or adaptive)
innate
phagocytes immune system (innate or adaptive)
innate
dendritic cells immune system (innate or adaptive)
innate
NK and ILCs immune system (innate or adaptive)
innate
B lymphocytes immune system (innate or adaptive)
adaptive
T lymphocytes immune system (innate or adaptive)
adaptive
plasma cells immune system (innate or adaptive)
adaptive
effector T cells immune system (innate or adaptive)
adaptive
Key Immunological Goals
Protect, Detect/Recognize, Recruit help, Eliminate/Tolerate, Remember
humoral immunity responding lymphocytes
B lymphocyte
humoral immunity effector mechanism
secreted antibody
block infections and eliminated extracellular microbes
humoral immunity function
cell-mediated immunity (phagocytosis in macrophage) responding lymphocytes
helper T lymphocyte
cell-mediated immunity (phagocytosis in macrophage) effector mechanism
cytokines -> activated macrophage
elimination of phagocytosed microbes
cell-mediated immunity (phagocytosis in macrophage) function
cell-mediated immunity (viral replication) responding lymphocytes
cytotoxic T lymphocyte
cell-mediated immunity (viral replication) effector mechanism
killed infected cell
kill infected cells and eliminated reservoirs of infection
cell-mediated immunity (viral replication) function
complement immune system (innate or adaptive)
innate
Phagocytes Digest what they have eaten then “present” ___
antigen to T cells
Severe, invasive infections with encapsulated (carbohydrate-coated) bacteria
Complement
doesn’t work
Soft tissue abscesses or lymphadenitis
Phagocytes don’t work
Main job is to make and secrete antibodies
B Cells
Opsinization, neutralization, complement activation
B Cells
Can secrete antibodies at or near the site of inflammation or can be distant
B Cells
Recurrent bacterial sinopulmonary infections (Sinusitis, Ear Infections, Bronchitis, Pneumonias) with bacteria
B cells and
Antibodies don’t work
Direct immune responses
CD4 “Helper” T cells
Kill cells infected with intracellular pathogens like viruses, fungi, etc.
CD8 “Cytotoxic” T cells
Control & modulate immune responses
“Regulatory” T cells
Inability to generate effective antibody responses, Severe viral and fungal infections, Autoimmunity
T cells don’t work
Facilitate communication/coordination of immune system
Cytokines & Chemokines
May promote larger systemic effects (i.e. fever)
Cytokines
Mediate cell attraction/migration of other immune cells via chemotaxis
Chemokines
First line of defense, Rapid activation/response, Immediately present
innate immune system
Physical and Chemical Barriers
innate immune system
Specialized Blood cells
innate and adaptive immune system
Broadly distinguish self from non-self
innate immune system
no memory
innate immune system
Recruited response (delay) when innate response cannot control/eliminate
adaptive immune system
Highly specific, coordinated
adaptive immune system
Generates immunological
adaptive immune system
Sites of immune cell genesis and development
Central/Primary structure of immune system
Bone Marrow (Central/Primary or Peripheral/Secondary)
Central/Primary structure of immune system
Thymus (Central/Primary or Peripheral/Secondary)
Central/Primary structure of immune system
Sites of immune cell activation and differentiation
Peripheral/Secondary (adaptive) structure of immune system
Spleen (Central/Primary or Peripheral/Secondary)
Peripheral/Secondary (adaptive) structure of immune system
Lymph Nodes (Central/Primary or Peripheral/Secondary)
Peripheral/Secondary (adaptive) structure of immune system
Tonsils/Adenoids (Central/Primary or Peripheral/Secondary)
Peripheral/Secondary (adaptive) structure of immune system
Mucosa-Associated Lymphatic Tissue (MALT) (Central/Primary or Peripheral/Secondary)
Peripheral/Secondary (adaptive) structure of immune system
Epithelial Barriers (Central/Primary or Peripheral/Secondary)
Peripheral/Secondary (adaptive) structure of immune system; not technically immunology organ but has important immunologic function
Blood (Central/Primary or Peripheral/Secondary)
Peripheral/Secondary (adaptive) structure of immune system; not technically immunology organ but has important immunologic function
Engulf bacteria and other small cells and particles, Digest to destroy them
Phagocytes
Most effective against bacterial and fungal pathogens (viruses are too small and parasites are too large)
Phagocytes
aka PMNs
Neutrophil (Phagocyte, innate immune system)
Most abundant leukocyte circulating in blood
Neutrophil (Phagocyte, innate immune system)
Large stores in bone marrow
Neutrophil (Phagocyte, innate immune system)
Recruited to tissues when needed by chemokines
Neutrophil (Phagocyte, innate immune system)
First line defense with short lifespan
Neutrophil (Phagocyte, innate immune system)
Die after phagocytosing pathogens, debris
Neutrophil (Phagocyte, innate immune system)
Tissue residents/sentinels, long life span
Macrophage (Phagocyte, innate immune system)
Derived from circulating blood monocytes
Macrophage (Phagocyte, innate immune system)
Generally the first to respond to danger
Macrophage (Phagocyte, innate immune system)
Phagocytose pathogens, debris
Macrophage (Phagocyte, innate immune system)
Function as Antigen Presenting Cell (APC)
Macrophage (Phagocyte, innate immune system)
APC
Antigen Presenting Cell
Secrete cytokines that initiate inflammation
Macrophage (Phagocyte, innate immune system)
Secrete chemokines that recruit other immune cells
Macrophage (Phagocyte, innate immune system)
cytokines
initiate inflammation
chemokines
recruit other immune cells
Crucial to wound healing
Macrophage (Phagocyte, innate immune system)
Migrate between tissues and lymphoid organs
Dendritic Cell (Phagocyte, innate immune system)
Phagocytose pathogens, debris then present what they find to T cells in lymphoid organs (APC)
Dendritic Cell (Phagocyte, innate immune system)
Can differentiate from monocytes/macrophages
Dendritic Cell (Phagocyte, innate immune system)
Secrete cytokines and chemokines
Dendritic Cell (Phagocyte, innate immune system)
Bridge innate and adaptive immune system
Dendritic Cell (Phagocyte, innate immune system)
Scan for normal cells and kill abnormal cells
Natural Killer cells (Innate Lymphocytes)
Directly kill the affected cells
Natural Killer cells (Innate Lymphocytes)
Important for defense against viral infections, malignancy
Natural Killer cells (Innate Lymphocytes)
Integrated in epithelial cell linings
Intraepithelial lymphocytes (IEL) (Innate Lymphocytes)
tissue resident and respond to stimuli via secretion of histamine, and other inflammatory mediators stored in granules
Mast cells (innate immune system)
very low numbers in blood, similar functions to mast cells, control of parasites
Basophils (innate immune system)
enter tissue from blood, kill parasites (nematodes, etc) by secreting toxic major basic protein, induce peristalsis and promote allergic inflammation
Eosinophils (innate immune system)
Serum proteins present in inactive form
Complement (soluble component of innate immune system)
Once the presence of a pathogen is detected, an enzymatic cascade is initiated
Complement (soluble component of innate immune system)
Results in lysis of bacterial pathogen, release of inflammatory signals, recruitment and activation of immune cells (both innate and adaptive)
Complement (soluble component of innate immune system)
work alone or in combination with antibodies
Complement (soluble component of innate immune system)
Small peptides with anti-microbial activity
Defensins (soluble component of innate immune system)
Found in mucosal and intestinal secretions, body fluids
Defensins (soluble component of innate immune system)
___ bind to and ‘recognize’ general classes of ___
PRPs, PAMPs
encoded by germline DNA
PRRs
there are many types of ___ but they are ___ and always the ___
PRRs, finite, same
B-lymphocytes are part of __ immunity
humoral (adaptive)
T-lymphocytes are part of __ immunity
cell-mediated (adaptive)
Recognize specific antigen with specific receptor (B cell receptor)
B-lymphocytes (adaptive)
Activated in secondary lymphoid organs
B-lymphocytes (adaptive)
When activated, ___ differentiate into ___ to secrete enormous amounts of a soluble form of their B-cell receptor (___)
B-lymphocytes, plasma cells, antibody
soluble form of their B-cell receptor
antibody
Antibodies highly specific and have crucial anti-microbial functions
B-lymphocytes (adaptive)
Respond to a great variety of pathogens
B-lymphocytes (adaptive)
molecule (protein, lipid, sugar, etc) that is capable of binding to the specialized receptors of adaptive lymphocytes and generates an immune response
Antigen
specific part of an antigen recognized by the specialized receptors
Epitope
Activated in secondary lymphoid organs, then migrate to site of infection
T lymphocytes (adaptive)
Recognizes specific protein antigens, requires presentation by MHC molecules
T lymphocytes (adaptive)
Respond to all types of pathogens, but particularly important for viral, fungal, and intracellular bacterial pathogens
T lymphocytes (adaptive)
“Helper cells”
CD4+ T cells
“Killer Cells”
CD8+ T cells
“Regulator cells”
T-regs
ABSOLUTELY ESSENTIAL for an effective adaptive immune response (and thus survival)
T lymphocytes (adaptive)
recognize native antigen
B cells
recognize processed antigen presented on MHC
T cells
group of lymphocytes that arising from a single common precursor that recognize a specific and distinct antigen
Clone
fully developed lymphocyte that has yet to have been successfully activated by it’s specific antigen
“Naïve” lymphocyte
lymphocyte that has encountered it’s specific antigen and received appropriate signals to differentiate
“Active/Activated” lymphocyte
activated lymphocyte that is exerting an active effect (also may hear effector functions)
“Effector” lymphocyte
Small molecules that are secreted by immune and non-immune cell types
Cytokines
Provide instructions for immune cells regarding the type of infection and what the immune cells should do
Cytokines
Can act locally and/or systemically
Cytokines
“between immune cells”
Interleukins (Cytokines)
Chemoattractant cytokines
Chemokines
Tell immune cells where to go
Chemokines
Used in normal immune cell trafficking (helps them find and go into lymphoid organs) and induced in case of infection (to find the tissue site of infection)
Chemokines