Transient transfection using 222 nm far UV-C irradiation

Area of Science:

• Molecular Biology
• Cell Biology
• Biotechnology

Background:

• Ultraviolet (UV) light is generally avoided for gene transfer due to its DNA-damaging properties.
• Far-UV C (F-UV) light, specifically 222 nm, presents a potential alternative with reduced DNA damage.
• Investigating F-UV light for plasmid introduction into cells is crucial for developing new gene transfer methods.

Purpose of the Study:

• To explore the efficacy of F-UV light irradiation for introducing plasmids into COS-7 and CHO-K1 cells.
• To evaluate the cytotoxicity of F-UV light exposure at various energy levels.
• To assess the characteristics of successfully transfected cells.

Main Methods:

• COS-7 and CHO-K1 cells were irradiated with 222 nm F-UV light.
• Green fluorescent protein (EGFP) plasmid DNA was added to cell cultures post-irradiation.
• Fluorescence microscopy, propidium iodide (PI), and Hoechst staining were used to evaluate transfection and cytotoxicity.

Main Results:

• Successful transfection of COS-7 and CHO-K1 cells with EGFP plasmids was achieved using F-UV irradiation.
• Optimal transfection efficiency was observed at 0.5 mJ/cm² for COS-7 and 1 mJ/cm² for CHO-K1 cells.
• Low cytotoxicity was noted at irradiation levels of ≤1 mJ/cm² for COS-7 and ≤0.5 mJ/cm² for CHO-K1 cells.

Conclusions:

• F-UV irradiation is a viable method for gene transfer, enabling plasmid introduction into mammalian cells.
• The study demonstrates successful EGFP plasmid transfection in two distinct cell lines.
• This approach offers a promising, low-cytotoxicity alternative for gene delivery applications.