Summary
A small population of T cells does not express the conventional T cell receptor characterized by theα andβ polypeptide chains (TCRαβ) but instead, two polypeptides termedγ andδ (TCRγδ). This alternative receptor is able to recognize antigen. It appears early in T cell ontogeny, but its role in the thymus prior to the availability of TCRαβ remains unclear. In selected sites such as skin or gut TCRγδ predominates in mice which might suggest a role ofγδ T cells in the first line of defense against infection,γδ T cells secrete lymphokines and display cytotoxic activity. However, their activation requirements may differ from what is known forαβ T cells since MHC-nonrestricted and also CD4 and CD8 negativeγδ T cells have been described. Preferential activation by mycobacterial antigens possibly indicates a special repertoire of theγδ T cells. In various diseases slightly increased numbers ofγδ T cells were found, but these preliminary studies have not yet provided evidence for a major pathogenetic role ofγδ T cells.
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Abbreviations
- C:
-
constant region (immunoglobulin or TCR gene segment)
- CD4:
-
cluster of differentiation 4 (mainly on helper cells)
- CD8:
-
cluster of differentiation 8 (mainly on cytotoxic cells)
- D:
-
diversity region (immunoglobulin or TCR gene segment)
- DNA:
-
desoxyribonucleic acid
- IL2:
-
interleukin 2
- J:
-
joining region (immunoglobulin or TCR gene segment)
- kD:
-
kiloDalton
- MHC:
-
major histocompatibility complex
- NK:
-
natural killer (cells)
- RA:
-
rheumatoid arthritis
- TCR:
-
T cell receptor
- V:
-
variable region (immunoglobulin or TCR gene segment)
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Bröker, B., Lydyard, P.M. & Emmrich, F. The role ofγδ T cells in the normal and disordered immune system. Klin Wochenschr 68, 489–495 (1990). https://doi.org/10.1007/BF01648239
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DOI: https://doi.org/10.1007/BF01648239