, China) at 37°C for 2 h, washed, and incubated for 2 h with 1:50 diluted FITC-conjugated secondary antibodies (Beijing Zhongshan Golden STI571 cell line Bridge Biotechnology Corp., China). The pcDNA-vector-transfected
cells were stained with anti-p16INK4a/p12 and anti-p14ARF antibodies. The nuclei of A549 cells transduced with p16INK4a protein were counterstained using Hoechst stain. Cell growth suppression assays Transduced cells or control cells were seeded onto 24-well plates at an initial density of 1 × 104 cells/mL and then trypsinized, harvested, and counted at 24-h intervals (plasmid transfection groups) or 12-h intervals (protein transduction groups). The cell number at each time point was determined in three separate wells and learn more experiments were independently repeated at least three times. Cell cycle analysis The redistribution of cells in the cell cycle was analyzed by flow cytometry analysis. After 48 h of cultivation, transduced cells and the control groups were harvested by trypsinization, washed with PBS and fixed in 75% ethanol at 4°C Ro 61-8048 for 24 h. The cycle TEST⁜ PLUS DNA Reagent Kit (BD Biosciences, San Jose, CA) was used for cell sample preparation and DNA staining according to the manufacturer’s guidelines. Cell
cycle distribution was analyzed by flow cytometry analysis (Bio-Rad, Richmond, CA). All experiments were repeated at least three times. Statistical analysis All values are expressed as means ± SD. Student’s t-test was used to assess statistical differences. A p value < 0.05 was considered significant. Results Construction and identification of A549 cell clones stably expressing exogenous p16INK4a, p14ARF and p12 Full-length cDNAs were cloned into pcDNA3 vectors designated as pcDNA3-p16INK4a, pcDNA3-p14ARF, and Phosphoribosylglycinamide formyltransferase pcDNA3-p12, verified by DNA sequencing (data not shown), and stably transfected into A549 cells. Positive cell clones were identified
by G418 screening for 14 days and the expression of exogenous p16INK4a, p14ARF, or p12 examined by RT-PCR and immunocytochemical assays. RT-PCR of the transfected cells confirmed the presence of products of the expected sizes (493, 543, and 372 bp) (Figure 2a). Immunocytochemical assay results were in agreement with the RT-PCR results and showed significant green fluorescence in cells transfected with each of the three transcripts, thus demonstrating protein expression. The empty-plasmid group stained with anti-p16INK4a/p12 and anti-p14ARF antibodies did not show fluorescence, excluding the background signals (Figure 2b). Figure 2 Identification of stable A549 cell clones for RNA and protein expression.a. RT-PCR detection of RNA expression of p16INK4a (lane 1), p14ARF (lane 2) and p12 (lane 3). The products were analyzed by 1% agarose gel electrophoresis. Lane M was loaded with DL 2000 DNA marker, with sizes shown on the left. b. Immunocytochemical assays detected expression of p16INK4a, p14ARF and p12 proteins in the cell clones.
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