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Differential distribution of oligodeoxynucleotides in developing organs with epithelial-mesenchymal interactions
U W Rothenpieler1, G R Dressler
1Laboratory of Mammalian Genes and Development, National Institute of Child Health and Human Development, Bethesda, MD 20892.
Nucleic Acids Research
|October 25, 1993
Summary
Antisense oligodeoxynucleotides (ODNs) show variable gene silencing success. This study found mesenchymal cells readily uptake ODNs, while mature epithelial cells do not, impacting therapeutic applications.
Area of Science:
- Molecular Biology
- Cell Biology
- Developmental Biology
Background:
- Antisense oligodeoxynucleotides (ODNs) are valuable tools for gene expression inhibition.
- Variability exists in antisense technology's application across different biological systems.
- Understanding cellular uptake is crucial for optimizing ODN efficacy.
Purpose of the Study:
- To evaluate the in vitro uptake of ODNs by various embryonic cell types.
- To correlate ODN distribution with cell differentiation and tissue development.
- To identify factors influencing ODN accessibility for gene silencing.
Main Methods:
- Culturing developing embryonic tissues in vitro with fluorescently labeled phosphorothioate ODNs.
- Assessing intracellular ODN distribution using fluorescent microscopy.
- Counterstaining tissue sections to identify epithelial basement membrane formation.
Main Results:
- High intracellular ODN levels were detected in mesenchymal cells of lung, salivary gland, kidney, ovary, and testis.
- ODN levels decreased significantly during new epithelium formation in kidneys and gonads.
- Mature epithelial cells across all tested tissues showed no detectable ODN uptake.
Conclusions:
- Mesenchymal cells demonstrate efficient ODN uptake, supporting gene inhibition potential.
- Mature epithelial cells exhibit resistance to ODN uptake in culture.
- ODN efficacy in complex organs may be limited by epithelial cell barriers, impacting therapeutic strategies.