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Transcription factor Egr-1 regulates glomerular mesangial cell proliferation
G Hofer1, C Grimmer, V P Sukhatme
1Medizinische Klinik IV der Universität Erlangen-Nürnberg, Nephrologische Forschungslabors, Loschgestrasse 8, 91054 Erlangen, Germany.
The Journal of Biological Chemistry
|November 8, 1996
Summary
Early growth response gene-1 (egr-1) drives mesangial cell proliferation in glomerulonephritis. Inhibiting egr-1 with antisense oligonucleotides significantly reduced cell replication, confirming its essential role in kidney disease progression.
Area of Science:
- Nephrology
- Molecular Biology
- Cell Biology
Background:
- Glomerular mesangial cell (MC) proliferation is a key feature of glomerulonephritis.
- Early growth response gene-1 (egr-1) expression correlates with MC proliferation.
Purpose of the Study:
- To determine if Egr-1 is essential for MC proliferation.
- To investigate the effect of inhibiting egr-1 expression on MC growth.
Main Methods:
- Utilized phosphothioate-modified antisense oligonucleotides (ODNs) to inhibit serum-induced egr-1 expression in cultured MCs.
- Quantified egr-1 mRNA and protein levels, and MC replication via [3H]thymidine uptake and cell counts.
- Tested various egr-1 antisense ODNs and control ODNs, assessing dose-dependency and comparing with heparin's effects.
Main Results:
- The most effective egr-1 antisense ODN reduced egr-1 mRNA by 68% and protein by 58%.
- MC replication was significantly inhibited (78% by [3H]thymidine uptake, 46% by cell counts).
- Inhibition of Egr-1 protein strongly correlated with reduced MC growth; effects were dose-dependent.
Conclusions:
- Egr-1 is a critical component of the mitogenic signaling pathway in MCs.
- Targeting Egr-1 with antisense ODNs offers a potential therapeutic strategy for glomerulonephritis.