1). The viral titers of Ad-GFP-HA117, Ad-GFP-MDR1 and Ad-GFP ranged between 2.5-3.5 × 109 plaque forming units (PFU)/ml. Figure 1 GFP expression GSK126 chemical structure in HEK 293 cells transducted with the recombinant adenoviruses Ad-GFP-HA117, Ad-GFP-MDR1 or Ad-GFP (×100). Fluorescence and adenovirus

quantification in 4T1 cells The expression of GFP in 4T1 cells was observed 48 h after transduction using a fluorescence microscope (Figure. 2). As shown in Figure 3, the transduction efficiencies of individual stable transductants were between 75- 80% when the adenovirus MOI = 50. In addition, the transduction efficiency increased with increasing concentration of adenovirus. Both the survival rate (over 80%) and the transduction efficiency (80%) of 4T1 cells were relatively high when the adenovirus MOI = 50. Thus, an MOI = 50 was used in further experiments. Figure 2 GFP expression in 4T1 cells 48 h after transduction. A: 4T1 cells (×100); B: 4T1/HA117, 4T1/MDR1 or 4T1/GFP transductants (×100); C: 4T1 cells (×200); D: 4T1/HA117, 4T1/MDR1 or 4T1/GFP transductants (×200). We show only one figure of the selleck all three transductants’ microscope images because of the limination of length. Figure 3 Transduction efficiency of 4T1 cells 48 h after transduction with Ad-GFP-HA117, Ad-GFP-MDR1 or Ad-GFP at a MOI = 50. A: Transduction efficiency of Ad-GFP-HA117 in 4T1/HA117 cells; B: Transduction efficiency of Ad-GFP-MDR1 in 4T1/MDR1 cells; C: Transduction efficiency of

Ad-GFP in 4T1/GFP cells. The number of cells is shown on the × axis. UR and UL indicate the cells with and without green fluorescence, respectively. Cells expressing GFP represent

those that were successfully transducted. This experiment was repeated at least 3 times with the same results. Up-regulation of HA117 and MDR1 mRNA and P-gp protein expression in 4T1 cells To detect changes in the mRNA and protein levels of HA117 and MDR1 in 4T1 cells transducted with Ad-GFP-HA117, Ad-GFP-MDR1 or Ad-GFP viral supernatants for 48 h and RT-PCR and western blotting analysis were performed. However, we could not be detect because an antibody against this protein has not been synthesized. As shown in Figure Adenosine 4, the mRNA levels of HA117 and MDR1 were remarkably higher in 4T1/HA117 and 4T1/MDR1 transductants than in 4T1 cells or 4T1/GFP transductants (P < 0.01 for HA117 and P < 0.05 for MDR1). In addition, western blotting analysis (Figure. 5) showed a corresponding increase change in P-gp expression in the 4T1/MDR1 transductants. Collectively, these results demonstrate that the expression of HA117 or MDR1 can be effectively up-regulated by recombinant adenovirus-mediated transduction of vectors expressing the HA117 or MDR1 genes, respectively. Figure 4 The mRNA expression levels of the HA117 and MDR1 genes in 4T1 cells 48 h after transduction of Ad-GFP-HA117 or Ad-GFP-MDR1 as quantified by RT-PCR. The levels of HA117 and MDR1 mRNA increased significantly 48 h after transduction.