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Two Monoclonal Antibodies Recognizing Carbohydrate Epitopes on Neural Adhesion Molecules Interfere with Cell Interactions

Authors

  • Thomas Fahrig,

    1. Department of Neurobiology, University of Heidelberg, Im Neuenheimer Feld 364, 6900 Heidelberg, Federal Republic of Germany
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  • Brigitte Schmitz,

    Corresponding author
    1. Department of Neurobiology, University of Heidelberg, Im Neuenheimer Feld 364, 6900 Heidelberg, Federal Republic of Germany
      Correspondence to: Brigitte Schmitz, as above
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  • Dieter Weber,

    1. Department of Neurobiology, University of Heidelberg, Im Neuenheimer Feld 364, 6900 Heidelberg, Federal Republic of Germany
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  • Andrea Kücherer-Ehret,

    1. Department of Neurobiology, University of Heidelberg, Im Neuenheimer Feld 364, 6900 Heidelberg, Federal Republic of Germany
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    • *

      Max-Planck-Institute for Psychiatry, D-8033 Martinsried bei München, Federal Republic of Germany

  • Andreas Faissner,

    1. Department of Neurobiology, University of Heidelberg, Im Neuenheimer Feld 364, 6900 Heidelberg, Federal Republic of Germany
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  • Melitta Schachner

    1. Department of Neurobiology, University of Heidelberg, Im Neuenheimer Feld 364, 6900 Heidelberg, Federal Republic of Germany
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Correspondence to: Brigitte Schmitz, as above

Abstract

We have studied two monoclonal antibodies raised against crude fractions of membrane glycoproteins from adult mouse brain and found them to react with two carbohydrate epitopes expressed on several neural cell adhesion molecules. Other identified and unidentified glycoproteins from different cell types, organs and species were also recognized by these antibodies. Both epitopes are N-glycosidically linked mannosidic or hybrid type oligosaccharides and co-expressed on all the glycoproteins so far tested. In spite of their remarkable similarities, the glycan epitopes are different as shown by ELISA competition assays. In microexplant outgrowth and cell adhesion assays, both antibodies interfere with neural cell adhesion, migration, and neurite outgrowth. These observations, together with previous studies on the L2/HNK-1 glycan (Künemund et al., 1988), indicate that adhesion molecules carry various carbohydrate epitopes mediating different cell interactions in in vitro assays.

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Ancillary