[Steroid drugs and GM-CSF modulates activity of Egr-1 in glioma cells]
Francisco Martínez-Flores1, Catalina Machuca-Rodríguez, Hugo Sandoval-Zamora
1Laboratorio de Bioterapéutica Molecular, Instituto Nacional de Rehabilitación, Secretaría de Salud, México. fcomartinez@inr.gob.mx
Introduction:
The Egr-1 protein is a transcriptional factor responsive to early growth. Transcriptional regulation of the promoter has been described like responsive to physical stress, osmotic changes, and cellular growth marker. However, there is no report about the pharmacological effect on the transcriptional regulation in gliomas. Hereby we report the modulation of the Egr-1 promoter transcriptional activity induced by the Granulocytes Macrophages Colony Stimulating Factor (GM-CSF) and steroid drugs in human glioma cells (CH235-GM Grade II, U373-GM Grade III, D54-GM Grade IV) using a reporter system transduced by a recombinant adenoviral vector AdEgr-1/luc7.
Methods:
Human glioma cells shows with different malignity grade (CH235-GM Grado II; U373-GM Grado III; D54-GM Grado IV) were transduced with no replicative adenoviral vector AdEgr-1/Luc7 and exposed to drugs as progesterone, β-estradiol and betametasone, and GM-CSF. Transcriptional activity of the egr-1 promoter was quantified by Luciferase reporter gene, cloned downstream to the tata box. Luciferase activity was quantified from whole cell proteins using luminometry assays.
Results:
U373-GM cell line with GM-CSF, shows an increment on transcriptional activity of Egr-1 promoter, also in endogen way. U373-GM showed a positive regulation of Egr-1, with steroid drugs on the times analyzed. Steroid drugs as progesterone, β-estradiol and betametasone, shows a pleiotropic behavior on CH235-GM and D54-GM, glioma cell lines.
Conclusions:
Inhibition or activation response of Egr-1 promoter shows new framework to explore a mechanism of action of steroid drugs on genetic and epigenetic regulation on tumoral process.
Insights
Granulocyte-Macrophage Colony-Stimulating Factor (GM-CSF) and steroid drugs modulate Egr-1 promoter activity in human glioma cells. This reveals new insights into the pharmacological effects on transcriptional regulation in gliomas.
Area of Science:
- Molecular Biology
- Cancer Research
- Pharmacology
Context:
- Egr-1 is a key transcriptional factor involved in cellular responses.
- Pharmacological effects on Egr-1 transcriptional regulation in gliomas remain underexplored.
- Glioma cell lines of varying grades (II, III, IV) were utilized.
Purpose:
- To investigate the impact of GM-CSF and steroid drugs on Egr-1 promoter activity in human glioma cells.
- To establish a reporter system for quantifying Egr-1 transcriptional regulation.
- To explore potential mechanisms of steroid drug action in glioma.
Summary:
- Human glioma cells were transduced with an adenoviral vector carrying the Egr-1/luc7 reporter.
- Cells were treated with GM-CSF and steroid drugs (progesterone, β-estradiol, betamethasone).
- GM-CSF increased Egr-1 promoter activity in U373-GM cells; steroid drugs showed varied effects across cell lines.
Impact:
- Demonstrates GM-CSF's role in activating Egr-1 transcription in specific glioma contexts.
- Highlights the pleiotropic effects of steroid drugs on Egr-1 regulation in different glioma grades.
- Provides a framework for understanding steroid drug mechanisms in glioma genetic and epigenetic regulation.
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