Production of Retroviral Particles for Gene Transfer

Begin with a culture of human kidney epithelial cells grown in a nutrient-rich medium.

Replace the medium with a reduced-serum medium to minimize serum interference and improve transfection efficiency.

Add the transfection mixture dropwise to the cells.

The mixture contains a retroviral DNA construct carrying the gene of interest, a packaging plasmid supplying essential viral proteins, and polyethylenimine, which forms complexes with the plasmid DNA to facilitate transfection.

Incubate the cells to allow uptake of the DNA complex.

Replace the medium to remove residual transfection reagents.

Inside the cell, the plasmid DNA enters the nucleus, where it directs the production of viral proteins and viral RNA carrying the gene of interest.

These components assemble and bud into the medium as recombinant retroviral particles.

Collect the virus-containing medium and store it briefly at a low temperature to maintain viral stability.

Centrifuge to pellet the cellular debris.

Aliquot the viral supernatant, snap-freeze in liquid nitrogen, and store at a low temperature for later gene transfer experiments.

In a 16-centimeter Petri dish, seed single cell suspension of Bosc23 cells in 18 milliliters of DM