NDLI: Kinetics of homophilic binding by embryonic and adult forms of the neural cell adhesion molecule.

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Kinetics of homophilic binding by embryonic and adult forms of the neural cell adhesion molecule.

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Kinetics of homophilic binding by embryonic and adult forms of the neural cell adhesion molecule.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Hoffman, S. Edelman, G. M.
Abstract	The neural cell adhesion molecule, N-CAM, is a cell surface glycoprotein found on embryonic and adult neurons and on a variety of ectodermal and mesodermal tissues in very early embryos. During development, it shows local variations in prevalence at the cell surface as well as conversion from an embryonic form (E form) with high sialic acid content to an adult form (A form) with lesser amounts of this sugar. This E leads to A conversion occurs on different schedules in different brain regions, and it has been hypothesized that both the conversion and the prevalence changes are related to early regulation of pattern formation and connectivity. In order to identify precisely the consequences of these mechanisms of local cell surface modulation of N-CAM, an assay was developed to measure the rate of aggregation either of vesicles reconstituted from lipid and purified N-CAM or of native brain membrane vesicles. In both preparations, aggregation was greater than 95% inhibitable by specific anti-(N-CAM) Fab' fragments. The rates of aggregation of reconstituted N-CAM vesicles and native brain vesicles were found to be inversely related to the sialic acid content of their N-CAM molecules, with full desialylation resulting in about a 4-fold increase in rate over E-form N-CAM. Intermediate rates were obtained both with A-form N-CAM (which contains only one-third of the sialic acid content of E-form N-CAM) and with partially desialylated E-form N-CAM. The rate of coaggregation of reconstituted vesicles containing E-form N-CAM with reconstituted vesicles containing A-form N-CAM was also intermediate, implying that desialylation did not change the nature of (N-CAM)-(N-CAM) binding but only its rate. Even larger alterations in vesicle aggregation rate were seen when the amount of N-CAM per vesicle was altered. A 2-fold increase in the N-CAM-to-lipid ratio of reconstituted vesicles resulted in a greater than 30-fold increase in their rate of aggregation. Moreover, desialylation did not cause a further increase in the rate of aggregation of these already rapidly aggregating vesicles. These results in a model system demonstrate the large range of binding rates that are obtainable by various forms of local surface modulation of N-CAM. They are consistent with the proposal that similar alterations affecting (N-CAM)-mediated cell adhesion in vivo may be major factors in pattern formation during development of the nervous system.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	18
Volume Number	80
Language	English
Publisher	National Academy of Sciences
Publisher Date	1983-10-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Antigens Metabolism Animals Brain Embryology Cell Adhesion Molecules Kinetics Molecular Weight Neuraminidase Sialic Acids Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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