B cells Humoral immune response
Jan 30, 2016
B cells
Humoral immune response
Antigen receptors on lymphocytes
Antigens: proteins, polysaccharides, lipids, nucleic acids, small molecules
Conformational and linear epitops
Complex of peptide-MHC molecule on an APC
Linear epitops
B cell T cell
B cell maturation
B cell maturation
pro B
pro B
pre B
pre Breceptor
Active Btk enables:
survival, proliferation and further maturation etc.
Mutation of BTK gene:
X-linked agammaglobulinemia
(Bruton’s agammaglobulinemia)
Btk
(Bruton’s tyrosine kinase)
pro B
immature B
IgM
pre B
pre Breceptor
pro B
pre B
pre Breceptor
IgMIgD
mature B
IgM
immature B
IgMIgD
CD40MHC II
B-7
Humoral immune response
Thymus-dependent(T-dependent, TD)
Thymus-independent(T-independent, TI)
Subsets of B cells
Phases of humoral immune response
Activation ofB cells
(two-signal requirement)
Activation of B cells(intracellular
signaling)
Functional consequence
sof B cell
activation
Functional consequence
sof B cell
activation
Functions of
antibody isotypes
Primary and
secondary antibody response