Efficient gene delivery to primary alveolar epithelial cells by nucleofection

Area of Science:

• Cell Biology
• Respiratory Medicine
• Gene Delivery Technologies

Background:

• Primary alveolar epithelial cells are crucial for lung research, particularly in studying gas exchange and barrier functions.
• Efficiently introducing genetic material into these cells remains a significant hurdle for experimental manipulation.

Purpose of the Study:

• To evaluate nucleofection as a method for highly efficient gene and oligonucleotide delivery into primary alveolar epithelial type II (ATII) cells.
• To assess the impact of nucleofection on ATII cell viability and monolayer integrity.
• To demonstrate the functional application of nucleofection in silencing specific genes in ATII cells.

Main Methods:

• Nucleofection, a form of electroporation for nuclear delivery, was applied to primary ATII cells.
• Green fluorescent protein (GFP) expression was used to quantify transfection efficiency via flow cytometry.
• Small interfering RNAs (siRNAs) were delivered to silence Akt and megalin genes.

Main Results:

• Nucleofection achieved up to 50% transfection efficiency in primary ATII cells with 3-8 μg plasmid DNA, maintaining high cell viability.
• Similar transfection rates were observed in cultured A549 and H441 cells.
• Nucleofection did not impair the integrity of ATII cell monolayers and successfully silenced Akt and megalin, inhibiting albumin transport.

Conclusions:

• Nucleofection is a highly effective technique for transfecting primary alveolar epithelial cells with both plasmids and oligonucleotides.
• This method offers high viability and consistent transfection rates, preserving key physiological properties of ATII cells.
• Nucleofection provides a valuable tool for advancing lung research involving primary alveolar epithelial cells.