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[Mg2+-dependent interaction of DNA with eukaryotic cells]
Molekuliarnaia Biologiia
|November 1, 1988
Summary
Eukaryotic cells, including mouse fibroblasts and myeloma cells, can bind DNA in a specific solution. A portion of this bound DNA is irreversibly attached, suggesting cellular uptake mechanisms.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Context:
- Investigates DNA interaction with eukaryotic cells under conditions mimicking liposome adsorption.
- Utilizes mouse fibroblasts (line A9) and myeloma cells for experimental models.
- Employs a 0.3 M sucrose solution with magnesium ions (Mg2+) to facilitate DNA binding.
Purpose:
- To study the mechanisms of DNA adsorption and irreversible binding to eukaryotic cells.
- To determine the influence of magnesium ion concentration on DNA-cell interactions.
- To explore the fate and stability of adsorbed DNA within the cellular environment.
Summary:
- Mouse fibroblasts and myeloma cells bind phage and plasmid DNA in a Mg2+-containing sucrose solution.
- Adsorption efficiency is not affected by trypsin pretreatment but depends on Mg2+ concentration.
- 10-15% of adsorbed DNA binds irreversibly, with a significant portion retaining its size after DNase I treatment, suggesting potential cellular internalization.
Impact:
- Provides insights into DNA-cell membrane interactions and potential DNA internalization pathways.
- Highlights the role of Mg2+ in modulating DNA binding to eukaryotic cells.
- Suggests that a portion of extracellular DNA may become stably associated with or enter cells, independent of metabolic processes.