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Published on: May 27, 2016
[Comparative analysis of activity of different promoters for NIS gene expression in melanoma cells]
Abstract:
Development of targeted drug delivery system is key problem of cancer gene therapy. To ensure specific delivery of these therapeutic compounds to the tumor it is preferable for therapeutic gene expression to occur predominantly in cancer cells. Therefore, when testing drug in vivo, it is necessary to study distribution of therapeutic gene expression products in different tissues of the organism. Sodium iodide symporter (NIS) is attractive reporter because its tissue level is easily quantitatively detected by noninvasive imaging methods. Different promoters are used to direct expression of therapeutic genes in tumor cells: strong nonspecific, moderate tissue-specific and tumor-specific. Tumor-specific promoters function in wide range of tumor cells, however they are relatively weak. Relationship between promoter and sodium iodide symporter activity is unclear to date. In this report we examined activity of different promoters in two melanoma cell lines, functional activity of NIS driven by these promoters, also we compared promoter strength and NIS activity. We demonstrated that in spite of strong differences in promoter activity functional activity of NIS directed by these promoters varies weakly. Relatively weak melanoma-specific promoter directs high NIS activity in melanoma cell, however weaker cancer-specific promoters drive high NIS activity only in certain melanoma cell line.
Insights
Investigating gene therapy for cancer, this study found that while promoter strength varies, the sodium iodide symporter (NIS) reporter gene activity remained similar across different promoters in melanoma cells.
Area of Science:
- Oncology
- Molecular Biology
- Biotechnology
Background:
- Targeted drug delivery is crucial for effective cancer gene therapy, requiring specific gene expression in tumor cells.
- The sodium iodide symporter (NIS) serves as a valuable reporter gene for non-invasive monitoring of therapeutic gene expression.
- The relationship between promoter strength and NIS activity in cancer cells remains poorly understood.
Purpose of the Study:
- To evaluate the activity of various promoters in driving gene expression in melanoma cell lines.
- To assess the functional activity of the sodium iodide symporter (NIS) reporter gene when driven by different promoters.
- To compare promoter strength with NIS activity to understand their correlation in cancer gene therapy.
Main Methods:
- Examined the activity of diverse promoters in two distinct melanoma cell lines.
- Quantified the functional activity of the sodium iodide symporter (NIS) reporter gene under the control of these promoters.
- Compared promoter strength and NIS reporter gene activity to establish correlations.
Main Results:
- Significant differences in promoter activity were observed, but functional NIS activity showed minimal variation across promoters.
- A melanoma-specific promoter, despite being weaker, effectively drove high NIS activity in melanoma cells.
- Weaker cancer-specific promoters exhibited high NIS activity only in specific melanoma cell lines, indicating cell-type dependency.
Conclusions:
- Promoter strength does not directly correlate with NIS reporter gene activity in melanoma cells.
- Melanoma-specific promoters can achieve robust NIS reporter gene expression, crucial for targeted gene therapy.
- The choice of promoter and its activity in specific cancer cell types are critical for successful NIS-based gene therapy monitoring.
