Abstract

ABSTRACT The immunoglobulin superfamily is the most abundant family of cell surface molecules, accounting for 50% of leukocyte surface glycoproteins. This evolutionary success story is thought to be due to the stability of the Ig domain, which is able to resist the harsh proteolytic and oxidative environment of the extracellular world. By mutation and selection, the Ig domain has evolved to serve many different functions including: receptors for growth factors (CSF-1 receptor, PDGF receptor, FGF receptors); receptors for the Fc region of Ig (IgG receptors; CD 16, CD32, CD64; CD89 IgA receptor); and as adhesion molecules, which now seems to be the function of the majority (CD2/CD58, CD28 and CTLA4, which bind to B7 and B70; CD4/class II, CD8/class I, CD31/CD31, CD50 (ICAM-3)/LFA-1, CD54 (ICAM-1)/LFA-1, CD102 (ICAM-2)/LFA-1, CD106 (VCAM)/VLA-4, NCAM/NCAM. L1, MAG, TAG-1, CEA) (Springer, 1990).

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