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]
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
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]
↑Wilkins AL, Yang W, Yang JJ (2003). "Structural biology of the cell adhesion protein CD2: from molecular recognition to protein folding and design". Curr Protein Pept Sci. 4 (5): 367–73. doi:10.2174/1389203033487063. PMID14529530.
↑ 4.04.1Yang JJ, Ye Y, Carroll A, Yang W, Lee HW (2001). "Structural biology of the cell adhesion protein CD2: alternatively folded states and structure-function relation". Curr Protein Pept Sci. 2 (1): 1–17. doi:10.2174/1389203013381251. PMID12369898.
↑Leong, Anthony S-Y; Cooper, Kumarason; Leong, F Joel W-M (2003). Manual of Diagnostic Cytology (2 ed.). Greenwich Medical Media, Ltd. p. 61. ISBN978-1-84110-100-2.
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Yang JJ, Ye Y, Carroll A, Yang W, Lee HW (2002). "Structural biology of the cell adhesion protein CD2: alternatively folded states and structure-function relation". Curr. Protein Pept. Sci. 2 (1): 1–17. doi:10.2174/1389203013381251. PMID12369898.
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Samelson LE, Fletcher MC, Ledbetter JA, June CH (1990). "Activation of tyrosine phosphorylation in human T cells via the CD2 pathway. Regulation by the CD45 tyrosine phosphatase". J. Immunol. 145 (8): 2448–54. PMID1976695.
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