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cAMP-Epac Pathway Stimulation Modulate Connexin-43 and MicroRNA-21 Expression in Glioma Cells
Hossein Mostafavi1, Mojtaba Khaksarian2, Mohammad Taghi Joghataei3
1Department of Physiology and Pharmacology, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran.; Stem Cell Technology Research Center, Molecular Biology and Genetic Engineering Department, Tehran, Iran.
Introduction:
Malignant astrocytic gliomas are the most common and lethal brain malignancies due to their refractory to the current therapies. Nowadays, molecular targeted therapy has attracted great attention in treatment of glioma. Connexin 43 (Cx43) and micro ribonucleic acid-21(miR-21) are among molecules that are involved in glioma development and progression. These molecules showed potential to be as target molecules with regard to glioma. Some studies have reported that cyclic adenosine monophosphate (cAMP) signaling could be effective on Cx43 and miR-21 in tissues other than in brain. We investigate possible relationship between β-adrenergic receptor and its newly described downstream, exchange protein directly activated by cAMP (Epac) signaling pathway and expression of Cx43 and miR-21 in low (1321N1) and high grade (U87MG) glioma cell lines.
Methods:
We treated cells with β-adrenergic agonist and Epac activator with and without adenyl cyclase inhibitor. Cx43 and miR-21 expression were measured with real-time PCR.
Results:
Our data showed that in 1321N1 cells, β-adrenergic-Epac pathway stimulation up and down-regulated Cx43 and miR-21 expression respectively. Whereas, in U87MG cells these interventions had no effect on Cx43 and miR-21 expression.
Discussion:
These findings demonstrate that low grade astrocytoma cells have better response to our pharmacological interventions.
Insights
Targeting the beta-adrenergic-Epac pathway impacts connexin 43 (Cx43) and microRNA-21 (miR-21) expression in low-grade glioma cells, but not high-grade cells. This suggests potential for novel therapeutic strategies in specific glioma types.
Area of Science:
- Neuro-oncology
- Molecular Biology
- Pharmacology
Background:
- Malignant astrocytic gliomas are aggressive brain tumors with limited treatment options.
- Connexin 43 (Cx43) and microRNA-21 (miR-21) are implicated in glioma development and progression.
- Cyclic adenosine monophosphate (cAMP) signaling pathways may influence Cx43 and miR-21 expression.
Purpose of the Study:
- To investigate the relationship between beta-adrenergic receptor/Epac signaling and Cx43/miR-21 expression in glioma cell lines.
- To determine if this pathway can be pharmacologically targeted for glioma treatment.
Main Methods:
- Treatment of low-grade (1321N1) and high-grade (U87MG) glioma cells with beta-adrenergic agonists and Epac activators.
- Assessment of Cx43 and miR-21 expression levels using real-time PCR.
- Inclusion of adenyl cyclase inhibitors to modulate cAMP signaling.
Main Results:
- Stimulation of the beta-adrenergic-Epac pathway upregulated Cx43 and downregulated miR-21 in 1321N1 (low-grade) cells.
- These interventions showed no significant effect on Cx43 and miR-21 expression in U87MG (high-grade) cells.
Conclusions:
- Low-grade astrocytoma cells exhibit a differential response to beta-adrenergic-Epac pathway modulation compared to high-grade cells.
- Pharmacological interventions targeting this pathway may be more effective in low-grade astrocytomas.
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