%0 Journal Article %J IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING %D 2007 %T Drug uptake enhancement using sonodynamic effects at 4 MHz - A potential application for micro-ultrasonic-transducers %A Siu, T %A Jackson, J %A Burt, H %A Chiao, M %P 1153--1156 %V 54 %X Sonodynamic therapy is a cancer treatment method that uses macro scale ultrasound devices to enhance the cytotoxic efficacy of anticancer drugs, such as doxorubicin [1]. In this paper, unconventional, miniature ultrasound transducers (5 mm x 5 mm x 0.5 mm) were used to create a tone-burst ultrasound (4 MHz, 32 Watt/cm(2), 20% duty cycle, 50 ms burst period). It was found that the transducer significantly (P < 0.01) enhanced the immediate cells lysis when combining with doxorubicin (20 mu M) in human prostate cancer cells (PC3). With a 30-s ultrasound exposure, the immediate cell lysis and long-term cytotoxicity were enhanced by 70% and 83%, respectively, compared to controls. We have demonstrated that ultrasound in combination with doxorubicin could strongly inhibit tumour cell proliferation in vitro at lower doses of the drug. This work is a first step towards a microelectromechanical system (MEMS)-based, implantable micro-ultrasonic transducers (MUTs) that could be used in sonodynamic therapy. %8 Jun %9 article