Abstract
An efficient, simple, and reproducible DNA-mediated gene transfer procedure has been developed for primary cultures of adult rat hepatocytes. Calcium phosphate-DNA precipitate is formed in complete culture medium during 5 hr incubation with cells. Unabsorbed precipitate is then washed out, and 40 hr later gene expression is measured. Under optimal conditions, up to 20-25% of cells in cultures transfected with the beta-galactosidase (lacZ) gene stain positively for this activity, and cells transfected with the chloramphenicol acetyl transferase (CAT) gene, fused to a strong promoter, express CAT activities of 10-14 nmoles/min per mg protein. Five conditions were optimized based on transfection efficiency, CAT expression, and cell viability. (i) Medium composition: the presence of protein, such as fetal bovine serum or bovine serum albumin, in the medium was essential. (ii) Cell substratum: tissue culture plastic was superior to calf skin collagen and Matrigel. (iii) Cell density: 0.5-1.0 X 10(6) cells/60-mm dish were superior to higher densities. (iv) Duration of exposure to calcium phosphate-DNA: 5-8 hr was better than shorter or longer times. (v) Length of time hepatocytes were maintained in culture before initiating transfect...Continue Reading
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