Summary
Cell recognition and adhesion are important events in embryonic development as well as in adult physiology. In recent years several cell adhesion molecules (CAMs), that mediate adhesive interactions between vertebrate cells, have been identified and characterized. These CAMs are in general cell surface-associated high molecular weight glycoproteins. Two groups of CAMs have been classified: primary CAMs, that appear early in development; secondary CAMs, that become expressed later and with a more restricted tissue distribution. One example of a secondary CAM is cellCAM 105. This glycoprotein was originally identified in rat hepatocytes, and was shown to be involved in the reaggregation of freshly isolated hepatocytesin vitro. Physico-chemical studies on pure cellCAM 105 have demonstrated that it has adhesive properties and can bind to itself in a homophilic, calcium-independent reaction. Immunochemical and immunohistochemical investigations have shown that cellCAM 105 occurs in liver, several epithelia, vessel endothelia, platelets and polymorphonuclear leukocytes, and that it is expressed primarily in terminally differentiated cells or cells that are undergoing terminal differentiation. Available information suggests that cellCAM 105 has different functions in different cell types, and that the common functional denominator might be membrane-membrane binding. Recent data indicate that cellCAM 105 is a calmodulin-binding protein, suggesting that cellCAM-mediated cell binding could be involved in transmembrane signalling.
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Abbreviations
- CAM:
-
cell adhesion molecule
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Öbrink, B., Blikstad, I., Hansson, M. et al. Cell-CAM 105-an adhesive cell surface glycoprotein. Protoplasma 145, 182–187 (1988). https://doi.org/10.1007/BF01349357
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DOI: https://doi.org/10.1007/BF01349357