Memory T cell - Wikipedia, the free encyclopedia

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** Memory T cell **

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For other uses, see Memory cell (disambiguation).
A lymphocyte is shown in the center of this picture
1. After the naive T cell (N) encounters an antigen it becomes activated
and begins to proliferate (divide) into many clones or daughter cells.
2. Some of the T cell clones will differentiate into effector T cells (E)
that will perform the function of that cell (e.g. produce cytokines in the
case of helper T cells or invoke cell killing in the case of cytotoxic T
cells).
3. Some of the cells will form memory T cells (M) that will survive in an
inactive state in the host for a long period of time until they
re-encounter the same antigen and reactivate.

*Memory T cells* are a subset of infection- as well as potentially
cancer-fighting T cells (also known as a T lymphocyte) that have previously
encountered and responded to their cognate antigen; thus, the term
antigen-experienced T cell is often applied. Such T cells can recognize
foreign invaders, such as bacteria or viruses, as well as cancer cells.
Memory T cells have become "experienced" by having encountered antigen
during a prior infection, encounter with cancer, or previous vaccination.
At a second encounter with the invader, memory T cells can reproduce to
mount a faster and stronger immune response than the first time the immune
system responded to the invader. This behaviour is utilized in T lymphocyte
proliferation assays, which can reveal exposure to specific antigens.

*Contents*

· 1 Sub-populations
· 2 Function
· 3 See also
· 4 References
· 5 Further reading
· 6 External links

*Sub-populations[edit]*

Within the overall memory T cell population, at least three


Source: en.wikipedia.org/wiki/Memory_T_cell


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