Immunology Flashcards
Role of C3b
Opsonisation
Allows bacteria-phagocyte binding, particularly important for encapsulated and GNB
Role of C3a and C5a
Chemotaxis
Recruit phagocytes
Degranulation of mast cells
Endothelial vasodilation and leakiness of blood vessels to allow neutrophils to enter tissue
Role of IL-8
Released from APCs
Upregulating and recruiting neutrophils
Role of TNF-alpha and IL-1
Release from APCs
Endothelial vasodilation and leakiness of blood vessels to allow neutrophils to enter tissue
Role of C5b
Binds to C 6, 7, 8, 9 to form Membrane attack complex which leads to cytolysis
Types of antibody that cannot activate classical complement pathway
IgA, IgE, IgD
Signals that activate NK cells
Downregulation of MHC-1 molecules on target cell
Activating receptors on target cells
CD16 Fc receptors on IgG (antibody dependent cell mediated cytotoxicity)
The alternative name of NK cell
Large granular lymphocyte
HLA genes on chromosome
Class 1 region - MHC 1 - A, B, C, E
Class 2 region - MHC 2- DP, DQ, DR
Class 3 region - Complement C2 and C4, TNF, HSP70
Cells that present MHC II
APCs
Cells that present MHC I
All nucleated cells
Signal 2 on Th Cell
CD 80/86 on APC binding to CD28 on naive T Cell
Leads to IL-2 production
Cytokines made by TH1 cells
IFN-gamma, TNF-alpha, IL-6
Cytokines made by TH-2
IL-4, IL-5
Cytokines made by TH-17
IL-17
Pathogen target of TH-1
Intracellular microbes
Pathogen target of TH-2
Helminth parasites
Pathogen target of TH-17
Extracellular bacteria, fungi
Cells with CD-40L
Activated effector T Cell
CD5 surface marker
On B1 subset of B cells
Non memory cells
IgM on surface