[The changes of ROS and mitochondria membrane potential in HepG2 cells on the pressure of cisplatin].

Objective: To explore the changes and significance of the level of reactive oxygen species (ROS) and mitochondria membrane potential (Delta Psi) in HepG2 cells under the stress of cisplatin (CDDP).

Methods: HepG2 cells were incubated with CDDP. The changes in the level of ROS were determined by a probe (2,7-dichloro fluorescein-ciactate, DCFH-DA) and the changes of Delta Psi were reflected as changes of intensities of fluorescence seen under a laser scan microscope using a probe (rhodamine-123). All these changes in cells at 0 h, 24 h, 48 h, 72 h, 120 h, 168 h were dynamically observed.

Results: The level of ROS was much higher after the CDDP treatment than the non-treated, and the increase lasted for 24 h and 48 h. Then it started to decrease at 72 h, gradually returning to normal level at 120 h. Under the selective pressure of CDDP, the fluorescence intensity of rhodamine-123 in HepG2 cells was decreasing at 24 h and 48 h, then gradually started to increase at 72 h. There were no such changes in the cells of the controls.

Conclusion: The changes of ROS and Delta Psi in HepG2 cells under the pressure of CDDP suggest that the cells change themselves adapting to such pressures.