Drug sensitivity assessment of pancreatic cancer cells by real-time cell analysis / 中国比较医学杂志

Objective To assess the drug sensitivity of pancreatic cancer cells based on real-time cell analysis and provide a reference for individualized diagnosis and treatment of pancreatic cancer.Methods Three human pancreatic cancer cells lines SW1900, Capan-2 and PANC-1 were selected and treated with gemcitabine hydrochloride and tegafur gimeracil oteracil potassium capsules, respectively.After 24 hours of culture, the cells were treated with the two drugs in gradient concentration.The cell growth curves before and after the drug administration was monitored using a real-time cells analyzer and the growth inhibition rates (IC50) of the drugs of the pancreatic cancer cells were calculated.At the same time, the cells in the cell culture plate were treated with the drug, and acridine orange/ethidium bromide (AO/EB) staining and laser scanning confocal microscopy were performed to observe the changes of cells after the drug administration.Results 72 hours after the drug administration, IC50 values for the three cell lines were different.The IC50 values of gemcitabine hydrochloride for SW1900, Capan-2 and PANC-1 cells were 1.69 μmol/L, 10.05 μmol/L and 12.74 μmol/L, respectively.The IC50 values of tegafur capsule for SW1900, Capan-2 and PANC-1 cells were 180.29 μmol/L, 765.70 μmol/L and 95.57μmol/L, respectively.AO/EB staining confirmed the reliability of IC50.Conclusions SW1900 and Capan-2 cells can be used as the control for gemcitabine hydrochloride and tegafur gimeracil oteracil potassium capsules to establish cell models for drug screening in vitro, which provides a reference for the application of the technology in anticancer drugs screening.

Bioassay-guided separation of effective components from Gentianella acuta and their protective effect on oxidative damage in PC12 cells induced by H2O2 / 中草药

Objective: To investigate the compounds of Gentianella acuta with strong protective effect on oxidative damage in PC12 cells induced by H2O2. Methods: Damage model of PC12 cells was established by H2O2 and real-time cell analysis (RTCA) was utilized to evaluate the protective effect of extracts and compounds. Meanwhile, bioassay-guided method was applied to separating effective components, and HPLC was used for the determination and structure confirmation of compounds. Results: Fractions of n-butanol and acetic ether showed protective effect on oxidative damage in PC12 cells induced by H2O2. The anti-oxidant activity of compounds 1 and 2 showed dose-dependent manner in the scope of 3.125-50.000 μmol/L, and the protective effect was the strongest at the concentration of 50.000 μmol/L. Compounds 3 and 5 showed the best protective effect at the concentration of 25.000 μmol/L and 3.125 μmol/L respectively. Compounds 1, 2, 3, and 5 were identified as bellidifolin, demethylbellidifolin, swertianolin and norswertianolin, respectively. Conclusion: Compounds 1, 2, 3, and 5 show protective effect on oxidative damage in PC12 cells induced by H2O2, maybe the main active components in G. acuta. But the mechanism is still uncertain, and further exploration is imperative.

Assessment of drug sensitivity of the prostate cancer cells based on real-time cell analysis system / 中国比较医学杂志

Objective To develop a more convenient and stable method for assessment of drug sensitivity of prostate cancer based on real-time cell analysis system as a reference for clinical treatment.Methods Human prostate cancer VCaP, DU145, PC-3, PC-3M-2B4 and PC-3M-IE8 cells were chosen to detect the sensitivity to three drugs, docetaxel, cabazitaxel and abiraterone acetate.Serial dilutions of the three drugs were used to treat the cell culture for 24 hours.The drug-induced effects on the cell lines after an incubation of 24 hours were recorded by the real-time cell analysis system to determine the half maximal inhibitory concentration (IC50).Results Docetaxel showd IC50 of 8.81 nmol/L, 11.61 nmol/L, 1.78 nmol/L, 1.44 nmol/L, 8.69 nmol/L for VCaP, DU145, PC-3, PC-3M-2B4, PC-3M-IE8 cells, respectively.Cabazitaxel showed IC50 of 3.73 nmol/L, 3.96 nmol/L, 10.41 nmol/L, 5.43 nmol/L, and 7.37 nmol/L, respectively, for the five cell lines.Abiraterone acetate showed IC50 of 8.34 μmol/L, 8.60 μmol/L, 24.20 μmol/L, 8.59 μmol/L, and 13.21 μmol/L for the five cell lines.Conclusions PC-3M-2B4 and DU145, VCaP and PC-3 cells can be used as control for docetaxel, cabazitaxel and abiraterone acetate to establish cell models for the drug screening in vitro and to provide reference for clinical applications.

Cytotoxicity of temporary cements on bovine dental pulp-derived cells (bDPCs) using realtime cell analysis

PURPOSE: To evaluate the cytotoxicity of temporary luting cements on bovine dental pulp-derived cells (bDPCs). MATERIALS AND METHODS: Four different temporary cements were tested: Rely X Temp E (3M ESPE), Ultratemp (Ultradent), GC Fuji Temp (GC), and Rely X Temp NE (3M ESPE). The materials were prepared as discs and incubated in Dulbecco's modified eagle's culture medium (DMEM) for 72 hours according to ISO 10993-5. A real-time cell analyzer was used to determine cell vitality. After seeding 200 microL of the cell suspensions into the wells of a 96-well plate, the bDPCs were cured with bioactive components released by the test materials and observed every 15 minutes for 98 hours. One-way ANOVA and Tukey-Kramer tests were used to analyze the results of the proliferation experiments. RESULTS: All tested temporary cements showed significant decreases in the bDPCs index. Rely X Temp E, GC Fuji Temp, and Rely X Temp NE were severely toxic at both time points (24 and 72 hours) (P.05); however, the cell viability was significantly reduced at 72 hours (P<.001). Light and scanning electron microscopy examination confirmed these results. CONCLUSION: The cytotoxic effects of temporary cements on pulpal tissue should be evaluated when choosing cement for luting provisional restorations.