Abstract
Various methods exist to transfect mammalian cells in culture. It is generally accepted that individual methods have to be optimized for each of the cell lines or cell types used. Despitethe use of optimized protocols, significant day-to-day variationsin transfection efficiency regularly occur. We postulate that the`status' of cell populations prior to transfection is involved insuch variability. This study evaluates standardized transfectionsdone at different phases of the cell cycle. Cell synchronizationwas achieved using mimosine. Transfection efficiency was monitored by fluorescence quantification of GFP (Green Fluorescent Protein). We show that transfection using the calcium-phosphate-DNA co-precipitation method, at differentphases of the cell cycle, yields variable expression levels of GFP. Highest GFP expression levels were seen when transfecting cell populations with a dominant representation of S-phase-cells.
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References
Batard P, Jordan M & Wurm FM (2001) Transfer of high copy number plasmid into mammalian cells by calcium phosphate transfection. Gene 270: 61–68.
Brunner S, Sauer T, Carotta S, Cotton M, Saltik M & Wagner E (2000) Cell cycle dependence of gene transfer by lipoplex, polyplex and recombinant adenovirus. Gene Ther 7: 401–407.
Dai Y, Gold B, Vishwanatha JK & Rhode SL (1994) Mimosine inhibits viral DNA synthesis through ribonucleotide reductase. Virology 205: 210–216.
Davis PK, Ho A & Dowdy SF (2001) Biological methods for cell-cycle synchronization of mammalian cells. Biotechniques 30: 1322–1331.
Dijkwel PA & Hamlin JL (1992) Initiation of DNA replication in the dihydrofolate reductase locus is confined to the early S period in CHO cells synchronized with the plant amino acid mimosine. Mol Cell Biol 12: 3715–3722.
Graham FL & Van der Eb AJ (1973) Transformation of rat cells by DNA of human adenovirus 5. Virology 52: 456–467.
Jordan M, Schallhorn A & Wurm FM (1996) Transfecting mammalian cells: optimization of critical parameters affecting calcium-phosphate precipitate formation. Nucleic Acid Res 24: 596–601.
Krude T (1999) Mimosine arrests proliferating human cells before onset of DNA replication in a dose-dependent manner. Exp Cell Res 247: 148–159.
Mortimer I, Tam P, MacLachlan I, Graham RW, Saravolac EG & Joshi PB (1999) Cationic lipid mediated transfection of cells in culture requires mitotic activity. Gene Ther 6: 403–411.
Orrantia E & Chang PL (1990) Intracellular distribution of DNA internalised through calcium phosphate precipitation. Exper Cell Res 190: 170–174.
Orren DK, Petersen LN & Bohr VA (1995) A UV-responsive G2 checkpoint in rodent cells. Mol Cell Biol 15: 3722–3730.
Reichard P (1993) From RNA to DNA, why so many ribonucleotide reductases? Science 260: 1773–1777.
Tsai WC & Ling KH (1971) Toxic action of mimosine. Inhibition of mitosis and DNA synthesis of H.Ep-2 cell by mimosine and 3,4-dihydroxypyridine. Toxicon 9: 241–247.
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Grosjean, F., Batard, P., Jordan, M. et al. S-phase synchronized CHO cells show elevated transfection efficiency and expression using CaPi. Cytotechnology 38, 57–62 (2002). https://doi.org/10.1023/A:1021197830091
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DOI: https://doi.org/10.1023/A:1021197830091