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Proteomics and transcriptomics analyses of ataxia telangiectasia cells treated with Dexamethasone
Michele Menotta1, Sara Orazi1, Anna Maria Gioacchini1
1Department of Biomolecular Sciences, University of Urbino "Carlo Bo", Urbino, Italy.
Abstract:
Ataxia telangiectasia (A-T) is an incurable and rare hereditary syndrome. In recent times, treatment with glucocorticoid analogues has been shown to improve the neurological symptoms that characterize this condition, but the molecular mechanism of action of these analogues remains unknown. Hence, the aim of this study was to gain insight into the molecular mechanism of action of glucocorticoid analogues in the treatment of A-T by investigating the role of Dexamethasone (Dexa) in A-T lymphoblastoid cell lines. We used 2DE and tandem MS to identify proteins that were influenced by the drug in A-T cells but not in healthy cells. Thirty-four proteins were defined out of a total of 746±63. Transcriptome analysis was performed by microarray and showed the differential expression of 599 A-T and 362 wild type (WT) genes and a healthy un-matching between protein abundance and the corresponding gene expression variation. The proteomic and transcriptomic profiles allowed the network pathway analysis to pinpoint the biological and molecular functions affected by Dexamethasone in Dexa-treated cells. The present integrated study provides evidence of the molecular mechanism of action of Dexamethasone in an A-T cellular model but also the broader effects of the drug in other tested cell lines.
Insights
Dexamethasone (Dexa) shows promise in treating Ataxia telangiectasia (A-T) by influencing specific proteins and gene expression. This study reveals Dexa's molecular mechanism in an A-T cellular model, offering insights for future therapies.
Area of Science:
- Biochemistry
- Genetics
- Molecular Biology
Background:
- Ataxia telangiectasia (A-T) is a rare, incurable genetic disorder with debilitating neurological symptoms.
- Glucocorticoid analogues, like Dexamethasone (Dexa), have shown therapeutic potential for A-T, but their mechanism remains unclear.
Purpose of the Study:
- To elucidate the molecular mechanism of Dexamethasone action in Ataxia telangiectasia.
- To investigate the effects of Dexa on protein and gene expression in A-T lymphoblastoid cell lines.
Main Methods:
- Proteomic analysis using 2DE and tandem MS to identify drug-affected proteins.
- Transcriptome analysis via microarray to assess gene expression changes.
- Integrated proteomic and transcriptomic network pathway analysis.
Main Results:
- Identified 34 proteins differentially influenced by Dexa in A-T cells compared to healthy cells.
- Observed differential gene expression in A-T (599 genes) and wild-type (362 genes) cells.
- Detected a discrepancy between protein abundance and gene expression levels.
Conclusions:
- The study provides evidence for Dexamethasone's molecular mechanism of action in an Ataxia telangiectasia cellular model.
- Integrated proteomic and transcriptomic data pinpointed biological functions affected by Dexa.
- Findings offer broader insights into Dexa's effects across different cell lines.
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