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Inducible and Reversible Dominant-negative DN Protein Inhibition
Published on: January 7, 2019
Insights on ornithine decarboxylase silencing as a potential strategy for targeting retinoblastoma
Sivashanmugam Muthukumaran1, Renganathan Bhuvanasundar2, Vetrivel Umashankar3
1Centre for Bioinformatics, Kamalnayan Bajaj Institute for Research in Vision and Ophthalmology, Vision Research Foundation, Chennai, India; School of Chemical and Biotechnology, SASTRA University, Thanjavur, India.
Abstract:
Ornithine Decarboxylase (ODC) is a key enzyme involved in polyamine synthesis and is reported to be up regulated in several cancers. However, the effect of ODC gene silencing in retinoblastoma is to be understood for utilization in therapeutic applications. Hence, in this study, a novel siRNA (small interference RNA) targeting ODC was designed and validated in Human Y79 retinoblastoma cells for its effects on intracellular polyamine levels, Matrix Metalloproteinase 2 & 9 activity and Cell cycle. The designed siRNA showed efficient silencing of ODC mRNA expression and protein levels in Y79 cells. It also showed significant reduction of intracellular polyamine levels and altered levels of oncogenic LIN28b expression. By this study, a regulatory loop is proposed, wherein, ODC silencing in Y79 cells to result in decreased polyamine levels, thereby, leading to altered protein levels of Lin28b, MMP-2 and MMP-9, which falls in line with earlier studies in neuroblastoma. Thus, by this study, we propose ODC silencing as a prospective strategy for targeting retinoblastoma.
Insights
This study demonstrates that silencing Ornithine Decarboxylase (ODC) in retinoblastoma cells reduces polyamine levels and impacts key cancer-related proteins. ODC gene silencing shows promise as a therapeutic strategy for retinoblastoma.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Ornithine Decarboxylase (ODC) is crucial for polyamine synthesis and often upregulated in cancers.
- The therapeutic potential of ODC gene silencing in retinoblastoma remains largely unexplored.
Purpose of the Study:
- To design and validate a small interference RNA (siRNA) targeting ODC in human Y79 retinoblastoma cells.
- To investigate the effects of ODC gene silencing on polyamine levels, Matrix Metalloproteinase (MMP) activity, and cell cycle progression.
- To explore the regulatory role of ODC in retinoblastoma, potentially involving oncogenic LIN28b.
Main Methods:
- Designed and validated a novel siRNA targeting ODC.
- Assessed ODC mRNA and protein expression in Y79 retinoblastoma cells.
- Measured intracellular polyamine levels, MMP-2 and MMP-9 activity, and cell cycle distribution.
- Analyzed the expression of oncogenic LIN28b.
Main Results:
- The designed siRNA effectively silenced ODC mRNA and protein expression in Y79 cells.
- Significant reduction in intracellular polyamine levels was observed post-ODC silencing.
- Altered expression levels of oncogenic LIN28b, MMP-2, and MMP-9 were noted.
- A potential regulatory loop involving ODC, polyamines, LIN28b, and MMPs was proposed.
Conclusions:
- ODC gene silencing is an effective strategy for reducing polyamine levels in retinoblastoma cells.
- ODC silencing influences key proteins like LIN28b, MMP-2, and MMP-9, suggesting a broader impact on cancer pathways.
- ODC silencing presents a promising therapeutic avenue for targeting retinoblastoma.
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