Functional and mutational analysis after radiation and cetuximab treatment on prostate carcinoma cell line DU145

Radiation Oncology

Karsten Neumann¹  Mathias Walke²  Günther Gademann²  Thomas Brunner²  Hans-Joachim Ochel²  Peter Hass²  Raik Schneider³  Martin Schostak⁴  Burkhard Jandrig⁴  Frank Christoph⁵ 

[1] Department of Pathology, Hospital Dessau-Rosslau, Dessau, Germany;Department of Radiotherapy, Otto-von-Guericke-University Magdeburg, University Hospital, Magdeburg, Germany;Department of Radiotherapy, Otto-von-Guericke-University Magdeburg, University Hospital, Magdeburg, Germany;Merck Serono Oncology, Darmstadt, Germany;Department of Urology, Otto-von-Guericke-University Magdeburg, University Hospital, Magdeburg, Germany;Department of Urology, Otto-von-Guericke-University Magdeburg, University Hospital, Magdeburg, Germany;Urology City West, Berlin, Germany;

关键词: Cetuximab;    Radiation;    DU145;    Prostate cancer;    Surviving fraction;    Resistance mutations;   

DOI  :  10.1186/s13014-021-01859-6

来源: Springer

【 摘 要 】

BackgroundEpidermal Growth Factor Receptor is often overexpressed in advanced prostate carcinoma. In-vitro-studies in prostate carcinoma cell line DU145 have demonstrated increased sensibility to radiation after cetuximab treatment, but clinical data are not sufficient to date.MethodsWe analyzed effects of radiation and cetuximab in DU145 and A431 using proliferation, colony-forming-unit- and annexin-V-apoptosis-assays. Changes in protein expression of pEGFR and pERK1/2 after radiation and cetuximab treatment were analyzed. Using NGS we also investigated the impact of cetuximab long-term treatment.ResultsCell counts in DU145 were reduced by 44% after 4 Gy (p = 0.006) and 55% after 4 Gy and cetuximab (p < 0.001). The surviving fraction (SF) was 0.69 after 2 Gy, 0.41 after 4 Gy and 0.15 after 6 Gy (each p < 0.001). Cetuximab treatment did not alter significantly growth reduction in 4 Gy radiated DU145 cells, p > 0.05 or SF, p > 0.05, but minor effects on apoptotic cell fraction in DU145 were detected. Using western blot, there were no detectable pEGFR and pERK1/2 protein signals after cetuximab treatment. No RAS mutation or HER2 amplification was detected, however a TP53 gen-mutation c.820G > T was found.ConclusionsRadiation inhibits cell-proliferation and colony-growth and induces apoptosis in DU145. Despite blocking MAP-Kinase-pathway using cetuximab, no significant radiation-sensitizing-effect was detected. Cetuximab treatment did not induce resistance-mutations. Further research must clarify which combination of anti-EGFR treatment strategies can increase radiation-sensitizing-effects.

【 授权许可】

CC BY