Lecture notes
CBG.27 T and B Cells
- Module
- Cell Biology and Genetics
- Institution
- Imperial College London (ICL)
This describes characteristics of T cells and B cells, in terms of their receptors and development.
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CBG.27 T and B Cell DevelopmentObjectives:
Clonal proliferation
B cells
o B cell development: B cell receptors
Antibodies
T cells
o T cell development: T cell receptors
o Fate of T cells
o Roles of CD4+ and CD8+ T cells
Clonal proliferation
2nd lymphoid organs
(Image source: Kuby Immunology 7th edition, page 15) (Owen, Punt & Stranford, 2013)
Binding of 1 lymphocyte receptor to 1 antigen clonal proliferation of stem cells (clonal selection &
expansion driven by antigen)
Deletion: Process of eliminating T or B cells that have too high a specificity OR specific to “self” molecules
for antigens (after they are made)
(i) Each lymphocyte bears 1 type of receptor with a unique specificity
(ii) Binding to lymphocyte receptor to specific antigen activate lymphocyte
(iii) Activated lymphocyte starts to differentiate daughter lymphocytes/effector cells have
similar receptors
(iv) Lymphocytes specific to “self” molecules are deleted absent from mature lymphocytes
repertoire
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