Modulation of the Inhibitory Substrate Properties of Oligodendrocytes by Platelet-Derived Growth Factor

Although growth cones typically collapse after encountering O1/galactocerebroside (GalC)-positive oligodendrocytes, the majority of growth cones traversed oligodendrocytes, which were raised for 8-10 d in medium containing 10 ng/ml platelet-derived growth factor (PDGF). Oligodendrocytes raised 8-10...

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Bibliographic Details
Published in:	The Journal of neuroscience Vol. 16; no. 18; pp. 5741 - 5748
Main Authors:	Lang, Dirk M, Hille, Michael G, Schwab, Martin E, Stuermer, Claudia A. O
Format:	Journal Article
Language:	English
Published:	United States Soc Neuroscience 15-09-1996 Society for Neuroscience
Subjects:	Animals Antibodies - immunology Astrocytes - physiology Biomarkers Culture Media, Conditioned Growth Inhibitors - antagonists & inhibitors Growth Inhibitors - immunology Growth Inhibitors - metabolism Myelin Sheath - metabolism Nerve Tissue Proteins - metabolism Oligodendroglia - drug effects Oligodendroglia - metabolism Platelet-Derived Growth Factor - pharmacology Rats
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Summary:	Although growth cones typically collapse after encountering O1/galactocerebroside (GalC)-positive oligodendrocytes, the majority of growth cones traversed oligodendrocytes, which were raised for 8-10 d in medium containing 10 ng/ml platelet-derived growth factor (PDGF). Oligodendrocytes raised 8-10 d in control medium caused growth cone collapse as they normally do, but failed to elicit this response after being transferred to PDGF-containing medium for an additional 8-10 d. The opposite was observed when PDGF-treated oligodendrocytes were brought to control medium. Growth cones collapsed when contacting these cells. Oligodendrocytes also lost their collapse-inducing activity when raised in medium conditioned by astrocytes, known to produce PDGF. Antibody IN-1 is directed against against neurite growth inhibitors (NI), proteins of 35 and 250 kDa on the surface of O1/GalC-positive oligodendrocytes, which are known to elicit growth cone collapse. IN-1 immunoreactivity was markedly reduced in PDGF-treated oligodendrocytes. However, both PDGF-treated and control oligodendrocytes exhibited myelin-associated glycoprotein, proteolipid protein, and myelin basic protein immunoreactivity. This suggests that PDGF-treatment affects NI expression but does not interfere with the expression of advanced myelin marker proteins. Because NI cause growth cone collapse, the loss of collapse-inducing activity by PDGF-treated oligodendrocytes suggests that PDGF regulates, directly or indirectly, the expression of these proteins.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0270-6474 1529-2401
DOI:	10.1523/jneurosci.16-18-05741.1996