B Cells: Antibodies and Diversity - German 2017- From Cutler Flashcards
What is the main job of B cells?
-Produce antibodies
What do the antibodies produced affect?
-Extracellular pathogens
What do B cells target?
-One antigen epitope
T/F B Cells have infinite target diversity
True
What is a plasma cell?
-Fully differentiated form of B cell that secretes antibodies
T/F B cells do not undergo clonal selection and expansion
False-They do undergo
Once B cells have been activated what happens to the targeting?
-It improves
What do the first three phases of B cell production take place?
-Bone marrow
What occurs in the first phase of B cell production?
-Generation of diverse and clonally expressed B-cell receptors
What occurs in Phase 2 of B cell production?
-Elimination or inactivation of B-cell receptors that bind to components of the human body (- selection)
What is Phase 3 of B cell production?
-Promotion of a fraction of immature B cells to become mature B cells in the secondary lymphoid tissues (+ selection)
T/F Antibodies are glycoproteins
True
What are four effector functions of produced antibodies?
-Receptors-Neutralization-Opsonization-Signaling
What are two cells that produced antibodies have receptor functions for?
-B cells-Granulocytes
What are the three sources of antigen diversity?
-Genetic recombination-Junctional diversity-Somatic hypermutation
Are the antigen binding sites the variable or constant region?
-Variable region
What two chains do you find on an antibody?
-Heavy Chain-Light Chain
T/F Isotype determines antibody class
True
What are the five isotypes of the Heavy chain of the antibody?
-IgG-IgA-IgM-IgE-IgD
What chain on the antibody binds the antigen?
-Heavy chain and light chain
What are the two isotypes of the light chain antibodies?
-Kappa-Lambda
What region of the antibody does complement interact with?
-Conservative region
When you cleave antibodies with proteases what are the products?
-2 Fab fragment-1 Fc fragment