Document Detail

Rapid effects of triiodothyronine on immediate-early gene expression in Schwann cells.
MedLine Citation:
PMID:  11460264     Owner:  NLM     Status:  MEDLINE    
In the peripheral nervous system, triiodothyronine (T3) plays an important role in the development and regeneration of nerve fibers and in myelin formation. However, the target genes of T3 in peripheral nerves remain to be identified. We investigated whether T3 activated genes of transcription factors in Schwann cells. Expression of egr-1 (krox-24), egr-2 (krox-20), egr-3, c-jun, junB, c-fos, fosB, fra-1, fra-2, and CREB genes was analyzed by reverse transcription-polymerase chain reaction (RT-PCR) in Schwann cells isolated from neonatal rat sciatic nerves and in the cell lines MSC-80 (mouse Schwann cells), NIH-3T3 (mouse fibroblasts), and CHO (Chinese hamster ovary cells). Some of these transcription factors have been shown to be involved in Schwann cell differentiation. T3 triggered a rapid (15-30 min), transient (1-2-h) and strong (6- to 15-fold) stimulation of Egr-1, Egr-2, Egr-3, Jun B, c-Fos, and Fos B mRNA expression in Schwann cells. In contrast, expression of c-Jun, Fra-1, Fra-2, and CREB mRNA was not affected by T3. The stimulatory effects of T3 could be abolished by adding actinomycin D. T3 triggered the same pattern of gene stimulation in the mouse Schwann cell line MSC80, but not in the NIH-3T3 and CHO cell lines. Serum activated all the genes that responded to T3 and in addition fra-1 and fra-2, but not c-jun and CREB. Immunoblotting showed that the increase in Egr-1 and c-Fos mRNA levels was accompanied by an increase in the corresponding proteins. In addition, shifts of the protein bands indicated a posttranslational modification of the two proteins. These effects of T3 are likely to be mediated by the intracellular T3 receptor, as the D-isomer RT3 and T0, which do not bind to T3 receptors, proved ineffective. The present data suggested that T3 may regulate Schwann cell functions and differentiation by transiently activating the expression of specific transcription factors.
G Mercier; N Turque; M Schumacher
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Glia     Volume:  35     ISSN:  0894-1491     ISO Abbreviation:  Glia     Publication Date:  2001 Aug 
Date Detail:
Created Date:  2001-07-19     Completed Date:  2001-09-20     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8806785     Medline TA:  Glia     Country:  United States    
Other Details:
Languages:  eng     Pagination:  81-9     Citation Subset:  IM    
Copyright Information:
Copyright 2001 Wiley-Liss, Inc.
U488 INSERM, Kremlin-Bicêtre, France.
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MeSH Terms
3T3 Cells / cytology,  drug effects,  metabolism
Animals, Newborn
CHO Cells / cytology,  drug effects,  metabolism
DNA-Binding Proteins / genetics,  metabolism
Early Growth Response Protein 1
Gene Expression Regulation, Developmental / drug effects*,  physiology
Genes, Immediate-Early / drug effects*,  physiology
Immediate-Early Proteins*
Peripheral Nerves / cytology,  metabolism*
Proto-Oncogene Proteins c-fos / genetics,  metabolism
Proto-Oncogene Proteins c-jun / genetics,  metabolism
RNA, Messenger / metabolism
Retroviridae Proteins, Oncogenic / genetics,  metabolism
Reverse Transcriptase Polymerase Chain Reaction
Schwann Cells / cytology,  drug effects*,  metabolism
Time Factors
Transcription Factors*
Triiodothyronine / analogs & derivatives,  metabolism,  pharmacology*
Reg. No./Substance:
0/DNA-Binding Proteins; 0/Early Growth Response Protein 1; 0/Egr1 protein, mouse; 0/Egr1 protein, rat; 0/Immediate-Early Proteins; 0/Proto-Oncogene Proteins c-fos; 0/Proto-Oncogene Proteins c-jun; 0/RNA, Messenger; 0/Retroviridae Proteins, Oncogenic; 0/Transcription Factors; 6893-02-3/Triiodothyronine

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