[Detection of reactive oxygen species of human dental pulp cells by flow cytometry]

To establish a method for detection of reactive oxygen species(ROS) of human dental pulp cells(HDPCs) by flow cytometry.

HDPCs were obtained using tissue explant technique in vitro. The subcultured cells were exposed to peroxide oxygen(H2O2) of different concentrations from 50 μmol/L to 400 μmol/L for 30 minutes, then incubated with two different concentrations of 2',7'-dichlorofluorescein diacetate (DCFH-DA), which were 10 μmol/L and 20 μmol/L for 20 minutes at 37 degrees centigrade in dark. The fluorescence intensities of intracellular dichlorofluorescein(DCF) were detected by flow cytometry. Statistical analysis was carried out by SPSS 13.0 software software.

The positive rate varied with different concentrations of detectors. The fluorescence intensities remained insignificant difference among samples incubated with the same concentration of detector and H(2)O(2),and increased by rising of the incubating concentration of H(2)O(2).

The detector with concentration of 20 μmol/L shows higher detector loading rate(positive rate). The intracellular ROS level changes as the H(2)O(2) treatment concentration rising from 50 to 400 μmol/L. The application of flow cytometry to measure the ROS in HDPCs is simple, reliable and stable.