CD2

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CD2 (cluster of differentiation 2) is a cell adhesion molecule found on the surface of T cells and natural killer (NK) cells. It has also been called T-cell surface antigen T11/Leu-5, LFA-2,[1] LFA-3 receptor, erythrocyte receptor and rosette receptor.[2]

Function

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It interacts with other adhesion molecules, such as lymphocyte function-associated antigen-3 (LFA-3/CD58) in humans, or CD48 in rodents, which are expressed on the surfaces of other cells.[3]

In addition to its adhesive properties, CD2 also acts as a co-stimulatory molecule on T and NK cells.[4]

Diagnostic relevance

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CD2 is a specific marker for T cells and NK cells, and can therefore be used in immunohistochemistry to identify the presence of such cells in tissue sections. The great majority of T cell lymphomas and leukaemias also express CD2, making it possible to use the presence of the antigen to distinguish these conditions from B cell neoplasms.[5]

Classification

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Due to its structural characteristics, CD2 is a member of the immunoglobulin superfamily; it possesses two immunoglobulin-like domains in its extracellular portion.[4]

Interactions

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CD2 has been shown to interact with CD2BP2,[6] Lck[7] and PSTPIP1.[8]

References

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  2. ^ Uniprot database entry for CD2 (accession number P06729)
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Further reading

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