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Myelinated, but not unmyelinated axons, reversibly down-regulate N-CAM in Schwann cells.

Jessen, KR; Mirsky, R; Morgan, L; (1987) Myelinated, but not unmyelinated axons, reversibly down-regulate N-CAM in Schwann cells. J Neurocytol , 16 (5) pp. 681-688.

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Abstract

There is evidence from chicks and mice that N-CAM expression in Schwann cells is subject to significant regulation during development and following injury. In the present work, rat sciatic nerve and immunohistochemical methods have been used to study developmental and injury-related modulation of N-CAM in Schwann cells, using cell type specific markers to identify different Schwann cell populations, and cell counting to quantify their size. The study has sought to determine unambiguously whether immature Schwann cells in developing nerves and denervated Schwann cells in injured adult nerves express surface N-CAM, and has investigated the temporal relationship between the gradual loss of surface N-CAM and the differentiation of myelin-forming Schwann cells, monitored by the sequential appearance of the glycolipid galactocerebroside and the myelin-specific protein P0. Further points examined are whether this down-regulation of N-CAM is rapidly reversible following loss of axonal contact, and whether N-CAM reappearance in Schwann cells depends on protein synthesis. In nerves from 17- to 18-day embryos, 90% of the Schwann cells, identified with Ran-1 antibodies, expressed surface N-CAM. In nerves from newborn rats many cells are in the early stage of myelin synthesis and therefore express galactocerebroside, although they have not yet acquired P0. Suspension staining of dissociated cells from this nerve showed that 92% of the galactocerebroside-positive cells were also N-CAM positive. In suspension staining of nerves from 5-day, 10-day and adult rats, P0-positive cells were essentially N-CAM negative.(ABSTRACT TRUNCATED AT 250 WORDS)

Type: Article
Title: Myelinated, but not unmyelinated axons, reversibly down-regulate N-CAM in Schwann cells.
Location: United States
Keywords: Animals, Antigens, Surface, Axons, Cell Adhesion, Cell Adhesion Molecules, Cells, Cultured, Embryo, Mammalian, Fluorescent Antibody Technique, Glycoproteins, Kinetics, Nerve Fibers, Myelinated, Rats, Rats, Inbred Strains, Schwann Cells, Sciatic Nerve
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Ophthalmology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Cell and Developmental Biology
URI: http://discovery.ucl.ac.uk/id/eprint/126244
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