PuSH - Publikationsserver des Helmholtz Zentrums München: Glycosylation is crucial for stability of tumour and cancer stem cell antigen EpCAM.

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Münz, M. ; Fellinger, K.* ; Hofmann, T.* ; Schmitt, B. ; Gires, O.

Glycosylation is crucial for stability of tumour and cancer stem cell antigen EpCAM.

Front. Biosci. 13, 5195-5201 (2008)

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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

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Epithelial cell adhesion molecule EpCAM is strongly over-expressed in a variety of carcinomas where it is involved in signalling events resulting in increased expression of target genes such as c-Myc, cyclins and others, eventually conferring cells an oncogenic phenotype. However, EpCAM is also expressed in a series of healthy epithelia, albeit generally to a far lesser extend. We have uncovered differential glycosylation of EpCAM as a means to discriminate normal from malignant tissues. EpCAM was hyperglycosylated in carcinoma tissue as compared with autologous normal epithelia. All three N-glycosylation consensus sequences within EpCAM's extracellular domain were used in human and murine cells. We show that glycosylation at asparagine198 is crucial for protein stability. Mutants of EpCAM that substitute asparagine198 for alanine showed a decreased overall expression and half-life of the molecule at the plasma membrane. This is of considerable importance with respect to EpCAM variants expressed in normal tissue, where it might reveal to be less stable and thus may have repercussions on functionality.

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