Capacitive hyperthermia as an alternative to brachytherapy in DNA damages of human prostate cancer cell line (DU-145)

The aim of this study was the evaluation of induced DNA damages of human prostate cancer cells, DU-145, treated with a combination of radiofrequency capacitive hyperthermia (HT) and teletherapy (EBRT) compared to a combination of teletherapy with high-dose rate brachytherapy (BR).

DU-145 cells were cultured as spheroids in 300 micron diameter. Then the following treatments were conducted: (a) EBRT at doses of either 2 Gy or 4 Gy of photon 15 MV, (b) HT for 0, 30, 60, and 90 minutes duration at 43 °C from a 13.56 MHz radiofrequency capacitive heating device (Celsius TCS), (c) BR with Ir-192 seed at doses of either 2 Gy or 5.5 Gy, (d) The mentioned HT followed by EBRT (HT + EBRT) and (e) EBRT followed by BR (EBRT + BR). Alkaline comet assay was performed to measure tail moment.

The induced DNA damages of DU-145 cells treated by adding HT to EBRT compared with EBRT alone, showed a significant enhancement; 3.28 and 5.14 times respectively for 30 and 60 minutes HT. By plotting dose-response curves, we could find a range of doses, which create radiobiological iso-effect in HT + EBRT and EBRT + BR treatments.

This study suggests that about DNA damages of DU-145 cells, HT + EBRT could partly be considered as an alternative to EBRT + BR.

International journal of radiation biology. 2018 Oct 25 [Epub ahead of print]

Seied Rabi Mahdavi, Azam Janati Esfahani, Samideh Khoei, Mohsen Bakhshandeh, Ali Rajabi

a Radiation Biology Research Center , Iran University of Medical Sciences , Tehran , Iran., c Department of Medical Biotechnology, School of Paramedical Sciences , Qazvin University of Medical Sciences , Qazvin , Iran., b Department of Medical Physics , Iran University of Medical Sciences , Tehran , Iran., d Radiation Technology Department, Allied Medical Sciences Faculty Shahid Beheshti University of Medical Sciences , Tehran , Iran., e Radiation Medicine Engineering Department , Shahid Beheshti University , Tehran , Iran .