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J Biol Chem, Vol. 273, Issue 30, 19283-19293, July 24, 1998

Identification and Characterization of a Bovine Neurite Growth Inhibitor (bNI-220)

Adrian A. Spillmann, Christine E. Bandtlow, Friedrich Lottspeich^¶, Flavio Keller, and Martin E. Schwab

From the  Brain Research Institute, University of Zürich and Swiss Federal Institute of Technology Zürich, August Forelstrasse 1, 8029 Zürich, Switzerland and ^¶ Genzentrum Martinsried, 82152 Martinsried, Germany

The poor axonal regeneration that follows lesions of the central nervous system (CNS) is crucially influenced by the local CNS tissue environment through which neurites have to grow. In addition to an inhibitory role of the glial scar, inhibitory substrate effects of CNS myelin and oligodendrocytes have been demonstrated. Several proteins including NI-35/250, myelin-associated glycoprotein, tenascin-R, and NG-2 have been described to have neurite outgrowth inhibitory or repulsive properties in vitro. Antibodies raised against NI-35/250 (monoclonal antibody IN-1) were shown to partially neutralize the growth inhibitory effect of CNS myelin and oligodendrocytes, and to result in long distance fiber regeneration in the lesioned adult mammalian CNS in vivo. We report here the purification of a myelin protein to apparent homogeneity from bovine spinal cord which exerts a potent neurite outgrowth inhibitory effect on PC12 cells and chick dorsal root ganglion cells, induces collapse of growth cones of chick dorsal root ganglion cells, and also inhibits the spreading of 3T3 fibroblasts. These activities could be neutralized by the monoclonal antibody IN-1. The purification procedure includes detergent solubilization, anion exchange chromatography, gel filtration, and elution from high resolution SDS-polyacrylamide gel electrophoresis. The active protein has a molecular mass of 220 kDa and an isoelectric point between 5.9 and 6.2. Its inhibitory activity is sensitive to protease treatment and resists harsh treatments like 9 M urea or short heating. Glycosylation is, if present at all, not detectable. Microsequencing resulted in six peptides and strongly suggests that this proteins is novel.

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