Lateral Mobility of the Cell Adhesion Molecule L1 Within the Surface Membrane of Morphologically Undifferentiated and Differentiated Neuroblastoma Cells

Authors

  • G. Elisabeth Pollerberg,

    Corresponding author
    1. European Molecular Biology Laboratory, Meyerhofstrasse 1, Postfach 10 22 40, 69 Heidelberg, FRG
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    • 1

      Max-Planck-Institut für Entwicklungsbiologie, II, Abteilung Biochemie, Spemannstrasse 35, 7400 Tübingen, FRG

  • Jean Davoust,

    1. European Molecular Biology Laboratory, Meyerhofstrasse 1, Postfach 10 22 40, 69 Heidelberg, FRG
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    • 2

      Centre d'Immunologie de Marseille-Luminy, Case 906, F-13288 Marseille Cedex 9, France

  • Melitta Schachner

    1. Department of Neurobiology, University of Heidelberg, Im Neuenheimer Feld 364, 69 Heidelberg, FRG
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Correspondence to: G. E. Pollerberg, as above

Abstract

Lateral mobility and localization in the surface membrane of the adhesion molecule L1 was studied in morphologically undifferentiated and differentiated neuroblastoma cells to gain insight into its possible association with the different molecular forms of N-CAM. In undifferentiated cells, the fraction of mobile L1 molecules is high and similar to that of N-CAM 140. Upon long-term morphological differentiation, the fraction of mobile L1 molecules is reduced by a factor of three and is similar to that of N-CAM 180, the predominant molecular form of N-CAM in differentiated neuroblastoma cells. Comparable to N-CAM 180, L1 is also preferentially accumulated at contact sites between these cells as seen by indirect immunofluorescence. These observations raise the question of whether at least part of the L1 molecules may be directly or indirectly (e.g. via N-CAM 180) linked to the cytoskeleton, thus stabilizing cell contacts between differentiated cells.

Ancillary