The use of RNA interference to increase PEI-mediated transient gene expression in mammalian cells
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Using flow cytometry, single cell sorting, confocal microscopy and fluorescent plasmids, a thorough study of DNA uptake, DNA fate and DNA expression in mammalian cells transfected with the widely used calcium-phosphate precipitation method was executed. We ...
Using transient expression, high amounts (>20 mg/mL) of secreted anti-human Rhesus-D IgG1 were produced in a suspension-adapted HEK293 EBNA cell line (Meissner et al., Biotechnol Bioeng 75: 197-203, 2001). Time of harvest was 3 days after transfection. For ...
One of the major hurdles of isolating stable, inducible or constitutive high-level producer cell lines is the time-consuming selection procedure. Given the variation in the expression levels of the same construct in individual clones, hundreds of clones mu ...
We have investigated the ability of double-stranded RNA (dsRNA) to inhibit gene expression in a vertebrate, the zebrafish, Danio rerio. Injection of dsRNA corresponding to the T-box gene tbx16/spadetail (spt) into early wild-type embryos caused a rapid and ...
Large-scale transient expression from mammalian cells is a new technology. Breakthroughs have been achieved for non-viral delivery methods: transfections can now be done at the 1-10 L scale with mammalian cells grown in suspension. Production of 1-20 mg/L ...
Low efficiency of transfection is often the limiting factor for acquiring conclusive data in reporter assays. It is especially difficult to efficiently transfect and characterize promoters in primary human cells. To overcome this problem we have developed ...
The expression of recombinant proteins with the Semliki Forest Virus (SFV) system has been scaled up to bioreactor scale. As a model protein for this study the human 5-HT(3) receptor was chosen. The gene for the receptor was subcloned into the SFV expressi ...
Transient gene expression (TGE) in mammalian cells at the reactor scale is becoming increasingly important for the rapid production of recombinant proteins. We improved a process for transient calcium phosphate-based transfection of HEK293-EBNA cells in a ...
Human papillomavirus type 18 (HPV18) capsid proteins L1 and L2, synthesised in mammalian cells using recombinant vaccinia viral expression vectors, are transported to the nucleus and assembled into virus-like particles. When 293T cells, which express SV40 ...
We have isolated and characterised the promoter of the mouse Scnn1a (alpha ENaC) gene. Using transient transfections of serial deletion mutants into Scnn1a-expressing cells, we demonstrate that 1.56 kb of 5' upstream sequence is required for cell-specific ...
