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Comparison of two cell-adhesion molecules, uvomorulin and cell-CAM 105

Experimental Cell Research, ISSN: 0014-4827, Vol: 157, Issue: 2, Page: 451-461
1985
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Article Description

Two cell adhesion molecules, cell-CAM 105 and uvomorulin (UM), were compared by analysing their antigenic structures, their activity in cell aggregation assays and their expression in various tissues. Cell-CAM 105 is a membrane glycoprotein which mediates the intercellular adhesion of reaggregating rat hepatocytes, and UM was first described to be involved in the compaction of preimplantation mouse embryos and embryonal carcinoma cells. UM is not only expressed during embryonic development but also in various adult tissues including liver, epithelia of lung, gut, kidney and uterus. A similar distribution for UM was found in rat tissues on cell types where cell-CAM 105 is known to be present. Our studies show that ( i ) cell-CAM 105 and UM are distinct and different proteins; ( ii ) uvomorulin is involved in the compaction of rat preimplantation embryos but Fab anti-UM has no effect on reaggregating rat hepatocytes, where Fab anti-cell CAM is effective; ( iii ) distribution studies show that UM is expressed on a broader range of epithelial cells while cell-CAM 105 is more restricted to hepatocytes and simple epithelia. In cases where both cell adhesion molecules are expressed on the same cell types they can be localized to different parts of the cell surface.

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