ASBESTOS FIBERS MEDIATE THE UPTAKE OF DNA INTO PRIMATE CELLS IN CULTURE.

Area of Science:

• Biotechnology
• Cell Biology
• Toxicology

Background:

• DNA exhibits strong binding affinity to the surface of chrysotile fibers.
• Understanding DNA-fiber interactions is crucial for assessing potential biological impacts.

Purpose of the Study:

• To investigate chrysotile fibers as potential transfection vehicles for DNA delivery.
• To evaluate the cellular uptake of DNA-adsorbed chrysotile fibers into monkey COS-7 cells.

Main Methods:

• Transfection of COS-7 cells with plasmid DNA (pSV2-neo) using chrysotile fibers, calcium phosphate, or saline.
• Microscopic analysis to observe fiber uptake and nuclear localization.
• Assessment of antibiotic resistance (G418) to quantify transfection efficiency.

Main Results:

• Chrysotile fibers were internalized by COS-7 cells and localized near cell nuclei.
• Transfection frequency using chrysotile fibers was approximately one-third of that achieved with calcium phosphate.
• Chrysotile fibers alone did not induce antibiotic resistance in the absence of plasmid DNA.

Conclusions:

• Chrysotile fibers can facilitate DNA transfection into mammalian cells.
• The mechanism of DNA uptake by chrysotile fibers may contribute to the cytotoxic and oncogenic effects of asbestos.