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. 1990 Mar;87(6):2349–2353. doi: 10.1073/pnas.87.6.2349

Long-term transplantation of canine keratinocytes made resistant to G418 through retrovirus-mediated gene transfer.

M E Flowers 1, M A Stockschlaeder 1, F G Schuening 1, D Niederwieser 1, R Hackman 1, A D Miller 1, R Storb 1
PMCID: PMC53684  PMID: 2315325

Abstract

We studied cultured canine keratinocytes to determine whether they could serve as targets for retrovirus-mediated gene transfer and whether infected cells could persist after transplantation into dogs, a large random-bred model for gene transfer studies. Canine keratinocytes obtained from skin biopsy samples were cultured in vitro with lethally irradiated NIH 3T3 cells used as a feeder layer. The keratinocyte colonies consisted of squamous epithelium with numerous desmosomes, tonofilaments, and keratohyalin granules. In addition, the cells were strongly reactive with monoclonal antibodies to cytokeratin intermediate filament proteins. For the infection studies, we grew the keratinocytes on a feeder layer of lethally irradiated PA317 retrovirus packaging cells, which produced a helper-free amphotropic retroviral vector containing the neomycin phosphotransferase (neo) gene. After cocultivation, 34% (range, 10-76%) of the keratinocytes were found to be resistant to the neomycin analogue G418. Infected keratinocytes were then transplanted into the dog of origin; 1% (range, less than 0.1-3%) of the keratinocytes obtained 27-130 days after transplantation from skin biopsy samples gave rise to G418-resistant colonies. We conclude that canine keratinocytes cultured in vitro can be infected efficiently with a neo gene-containing retroviral vector, and they show persistent G418 resistance for at least 130 days after transplantation into the skin donor.

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Selected References

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