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Cellular uptake of phosphorothioate oligodeoxynucleotides is negatively affected by cell density in a transformed rat
1Laboratory of Pulmonary Pathobiology, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27707.
Abstract:
Antisense oligodeoxynucleotides have been used to specifically inhibit the expression of a variety of genes. In the process of testing phosphorothioate oligodeoxynucleotides (S-oligos) as specific inhibitors of transforming growth factor alpha synthesis, we observed that the efficiency of cellular uptake of S-oligos was not constant throughout the culture period but decreased as the cell densities increased. Our data suggest that the mechanism by which oligonucleotides enter cells is negatively affected by increased cell density. These results emphasize the importance of determining uptake kinetics before designing and interpreting antisense experiments using phosphorothioate oligonucleotides.
Insights
Cellular uptake of phosphorothioate oligodeoxynucleotides (S-oligos) decreases with increasing cell density. This suggests cell density negatively impacts oligonucleotide entry mechanisms, crucial for antisense experiments.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Antisense oligodeoxynucleotides are utilized for targeted gene expression inhibition.
- Phosphorothioate oligodeoxynucleotides (S-oligos) are investigated for inhibiting transforming growth factor alpha synthesis.
Purpose of the Study:
- To evaluate the cellular uptake efficiency of S-oligos over time.
- To determine the impact of cell density on S-oligo cellular uptake.
Main Methods:
- Monitoring S-oligo cellular uptake in cell cultures.
- Analyzing uptake efficiency at varying cell densities.
Main Results:
- S-oligo cellular uptake efficiency was not constant and decreased as cell densities increased.
- Increased cell density negatively affects the mechanism of oligonucleotide entry into cells.
Conclusions:
- Cell density is a critical factor influencing S-oligo cellular uptake.
- Uptake kinetics must be assessed prior to designing antisense experiments with S-oligos.