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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Phillips, L. J. Glaser, M. Chan, J. R. |
| Description | Author Affiliation: Chan JR ( Department of Biochemistry and the Neuroscience Program, University of Illinois, Urbana, IL 61801, USA.); |
| Abstract | Dexamethasone and progesterone have been found to accelerate the time of initiation and enhance the rate of myelin synthesis in Schwann cell/neuronal cocultures. The expression of mRNA for cytochrome P450scc (converts cholesterol to pregnenolone), 3beta-hydroxysteroid dehydrogenase (converts pregnenolone to progesterone), and the progesterone receptor were detected and markedly induced during peak myelin formation in the cocultures. The mRNA for the glucocorticoid receptor was detected, but was found to be constituitively expressed. In addition, the specific activity of 3beta-hydroxysteroid dehydrogenase was measured and found to increase by 10-fold. The mRNA for cytochrome P450scc and 3beta-hydroxysteroid dehydrogenase also were found to be induced during the differentiation of O-2A precursor cells to oligodendrocytes. Fibroblast growth factor and platelet-derived growth factor were found to have proliferative effects on Schwann cells, but they had no effect on the initiation or the rate of myelin formation. These results demonstrate that myelin-forming cells have inducible enzymes responsible for steroid biosynthesis and suggest a critical role for endogenous steroid hormones in signaling the initiation and enhancing the rate of myelin formation. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 18 |
| Volume Number | 95 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1998-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Dexamethasone Metabolism Myelin Sheath Physiology Progesterone Signal Transduction 3-Hydroxysteroid Dehydrogenases Genetics Animals Cells, Cultured Cholesterol Side-Chain Cleavage Enzyme Coculture Techniques DNA Primers Oligodendroglia Cytology Enzymology RNA, Messenger Rats, Sprague-Dawley Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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