The research group led by Luca Cucullo and Damir Janigro from the Cleveland Clinic Lerner College of Medicine, Ohio, USA exposed rat and human tumour cells to very low intensity (7.5 microamps) 50 Hertz alternating current pulses, with a ten-second interval, for three days in vitro. Such electrical stimulation is known not to damage cells but to decrease the proliferation of tumour cells. The tumour cell lines used overexpress the MDR1 protein, which makes them resistant to anti-cancer drugs such as doxorubicin. Following the three days of electrical stimulation, the cells were exposed to increasing concentrations of doxorubicin for three hours.
Janigro et al.'s results show that electrical stimulation led to an increased uptake of doxorubicin, which caused the cells to die, even at low doxorubicin concentrations. Exposing the cells to an electric current was more effective than treating the cells with an MDR1 inhibitor. These findings suggest the potential application of electrical stimulation to improve the efficacy of existing chemotherapeutic treatments.
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BioMed Central
16-Mar-2006