Abstract
We have identified a 95 kd cell surface protein, DM-GRASP, that is expressed on a restricted population of axons. Its expression begins early in chick embryogenesis, and within the spinal cord it is localized to axons in the dorsal funiculus, midline floorplate cells, and motoneurons. Antibodies to DM-GRASP impair neurite extension on axons, and purified DM-GRASP supports neurite extension from chick sensory neurons. We have cloned and sequenced the cDNA corresponding to this protein and find that it is a new member of the immunoglobulin superfamily of adhesion molecules. Consequently we have named this protein DM-GRASP, since it is an immunoglobulin-like restricted axonal surface protein that is expressed in the dorsal funiculus and ventral midline of the chick spinal cord.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Activated-Leukocyte Cell Adhesion Molecule
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Amino Acid Sequence
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Animals
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Antibodies, Monoclonal / immunology
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Axons / metabolism
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Axons / physiology*
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Base Sequence
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Cell Adhesion Molecules, Neuronal / genetics
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Cell Adhesion Molecules, Neuronal / metabolism
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Cell Adhesion Molecules, Neuronal / physiology*
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Central Nervous System / embryology
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Central Nervous System / metabolism
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Central Nervous System / ultrastructure
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Chick Embryo
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Cloning, Molecular
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DNA / genetics
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Extracellular Matrix Proteins / genetics
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Extracellular Matrix Proteins / metabolism
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Extracellular Matrix Proteins / physiology*
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Immunoglobulins / genetics
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Immunoglobulins / metabolism
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Immunoglobulins / physiology*
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Immunohistochemistry
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Membrane Proteins / genetics
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Membrane Proteins / immunology
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Membrane Proteins / metabolism
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Membrane Proteins / physiology*
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Molecular Sequence Data
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Molecular Weight
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Nerve Tissue Proteins / genetics
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Nerve Tissue Proteins / metabolism
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Nerve Tissue Proteins / physiology*
Substances
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Activated-Leukocyte Cell Adhesion Molecule
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Antibodies, Monoclonal
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Cell Adhesion Molecules, Neuronal
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Extracellular Matrix Proteins
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Immunoglobulins
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Membrane Proteins
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Nerve Tissue Proteins
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DNA