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Structural and functional studies on N-CAM neural cell adhesion molecules.

M Hirn, H Deagostini-Bazin, G Gennarini

    Journal De Physiologie
    |January 1, 1985
    PubMed
    Summary

    Neural cell adhesion molecules (N-CAM) exhibit developmental changes in sialic acid content, impacting binding properties. Heterogeneity in N-CAM polypeptides and their expression on neurons and astrocytes are key findings.

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    Area of Science:

    • Neuroscience
    • Cell Biology
    • Molecular Biology

    Background:

    • Neural cell adhesion molecules (N-CAM) are crucial for nervous system development and function.
    • N-CAMs are characterized by high sialic acid content, forming unusual polymers that change during development.
    • These sialylation changes significantly influence N-CAM binding properties.

    Purpose of the Study:

    • To investigate the heterogeneity of N-CAM polypeptides at the mRNA and gene levels.
    • To characterize the different forms and expression patterns of N-CAM in the mouse brain.
    • To understand the molecular basis of N-CAM function and regulation.

    Main Methods:

    • Isolation of cDNA clones for mouse N-CAM.
    • Analysis of N-CAM polypeptide heterogeneity (180 K, 140 K, 120 K).

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  • Investigation of N-CAM expression on neurons and astrocytes using molecular techniques.

    • Main Results:

    • Identified multiple mRNA species for N-CAM in mouse brain, suggesting complex regulation.
    • Characterized three distinct N-CAM polypeptides with varying membrane association and cytoplasmic domains.
    • Demonstrated N-CAM expression on both neurons and astrocytes, including cultured astrocytes, challenging previous findings.
    • Observed a decrease in sialic acid content during development, affecting N-CAM binding.

    Conclusions:

    • N-CAM expression is complex and dynamic, involving multiple mRNA species and polypeptide forms.
    • N-CAM heterogeneity and sialylation are critical for nervous system development and cell adhesion.
    • Further research into N-CAM gene regulation and function is warranted.