Manipulation of radiation-induced bystander effect in prostate adenocarcinoma by dose and tumor differentiation grade: In vitro study

作者：Tubin Slavisa^*; Valeriani Maurizio; Salerno Gerardo; Bracci Stefano; Stoppacciaro Antonella; Cardelli Patrizia; Osti Mattia Falchetto; De Sanctis Vitaliana; Minniti Giuseppe; Enrici Riccardo Maurizi

来源：International Journal of Radiation Biology, 2015, 91(2): 166-171.

DOI：10.3109/09553002.2015.959667

• Bystander effect
• prostate
• adenocarcinoma

Purpose: This in vitro study evaluated the ability of prostate adenocarcinoma (ADC) cells to induce radiation-induced bystander effect (RIBE) exploring the factors that may be responsible and affect its intensity. The idea was to mimic a strong, clinically applicable RIBE that could lead to the development of innovative approaches in modern radiotherapy of prostate cancer, especially for those patients with hormone-refractory ADC in which radiotherapy might have a limited role.
Materials and methods: Two human prostate cancer cell lines of different differentiation, PC-3 and DU-145, have been irradiated using wide range of doses to obtain radiation-conditioned medium (RCM), which was used to treat the unirradiated cells and to evaluate the cytokines level. Using a trypan blue dye exclusion method, cell growth was assessed.
Results: Prostate ADC cells were able to induce RIBE; intensity depended on dose and cell differentiation. RIBE intensity of DU-145 was not correlated with the cytokines level, while for PC-3 Interleukin-6 (IL-6) correlates with strongest RIBE induced by 20 Gy.
Conclusions: RIBE can be manipulated by modifying radiation dose and depends on cell differentiation status. IL-6 correlates with RIBE after exposure of PC-3 to a very high dose of radiation, thus indicates its possible involvement in bystander signaling.

• 出版日期2015-2