NCAM (neural cell adhesion molecule, CD56) is an adhesion glycoprotein with five extracellular immunoglobulin-like domains followed by two fibronectin type III repeats. Structural diversity is introduced by alternative splicing resulting in different cytoplasmic domains (1). NCAM mediates neuronal attachment, neurite extension and cell-cell interactions through homo and heterophilic interactions. PSA (polysialic acid) post-translationally modifies NCAM and increases the metastatic potential of small cell lung carcinoma, Wilms+ tumor, neuroblastoma and rhabdomyosarcoma (2). CD56 and CD16 are commonly used to identify NK cells although some cells with the T cell markers CD3 and CD4 also express CD56 (3).1) Cunningham, B. A. et al. (1987) Science 236, 799-806. Seidenfaden, R. et al. (2003) Mol. Cell. Biol. 23, 5908-5918. Robertson, M. J. and Ritz, J. (1990) Blood 76, 2421-2438.
Immunogen
CD56 (NCAM) antibody was raised against a peptide sequence around aa.850~854 (Q-T-K-E-N) derived from Human CD56 (NCAM).