What is an example of T-independent antigens?
What is an example of T-independent antigens?
Thymus-independent antigen is an immunogen that can stimulate B cells to synthesize antibodies without participation by T cells….Thymus-independent antigen.
| TD antigens | TI antigens | |
|---|---|---|
| Examples | Microbial proteins, non-self or alter-self proteins | Pneumococcal polysaccharide, lipopolysaccharide, flagella |
How can you differentiate a dependent from T-independent antigens?
Protein antigens are called T-dependent antigens because they can only activate B cells with the cooperation of helper T cells. Other molecule classes do not require T cell cooperation and are called T-independent antigens.
What types of antigens do T cells not recognize?
T cells do not recognize free-floating or cell-bound antigens as they appear on the surface of the pathogen. They only recognize antigen on the surface of specialized cells called antigen-presenting cells. The MHC is the cluster of genes that encode these antigen-presenting molecules.
Which is an example of a T independent antigen?
T-independent antigens are antigens which can directly stimulate the B cells to produce antibody without the requirement for T cell help In general, polysaccharides are T-independent antigens. • Examples – Microbial proteins 2- T-dependent antigen:
How are antigens displayed in a T cell?
Antigen-presenting cells display antigens through MHC molecules. According to the interaction of antigens with T cells, two types of antigens are present. They are T cell-dependent antigens and T cell independent antigens.
How are T cell dependent antigens induced by B cells?
T cell-dependent antigens cannot stimulate the direct activation of B cells in the production of antibodies without the assistance of T cells. These antigens consist of follicular B cells, and secondary response can be induced due to the presence of memory B cells.
How are TI antigens different from other antigens?
There are 2 distinct subgroups of TI antigens, different in mechanism of activating B lymphocytes. TI-1 antigen, which has an activity that can directly activate B cells and TI-2 antigen, which has highly repetitive structure and causes simultaneous cross-linking of specific B cell receptors (BCR) on B lymphocyte.