Improving Transient Transfection Efficiency in a Differentiated, Polar Epithelial Cell Layer.

Area of Science:

• Cell Biology
• Biotechnology
• Epithelial Biology

Background:

• Transfecting polar, differentiated epithelial cells is challenging compared to nonpolar models.
• Confluent epithelial cell layers present a significant barrier to efficient gene delivery.

Purpose of the Study:

• To develop a strategy for enhancing transfection efficiency in polar, differentiated epithelial cells.
• To investigate methods to overcome the low transfection rates in models like CACO-2 cells.

Main Methods:

• Utilized a chemical abrasion method involving trypsin and EDTA pretreatment.
• Applied this pretreatment to differentiated CACO-2 human intestinal epithelial cell layers before using transfection reagents.

Main Results:

• Pretreatment with trypsin and EDTA dramatically improved transfection efficiency in polar, differentiated epithelial cells.
• The chemical abrasion method induced leakiness in the epithelial barrier by disrupting tight junctions and causing cell death/detachment.

Conclusions:

• Chemical abrasion is an effective strategy to enhance transfection in challenging polar epithelial models.
• The induced epithelial barrier compromise limits its use to studies assessing barrier reformation, not functional barrier assessment.