김병혁 (Byoung Hyuck Kim) 서울대학교 의과대학, 서울대학교병원
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Clin. Cancer Res., Published Online First October 1, 2019 | DOI: 10.1158/1078-0432.CCR-19-0610
Identification of FES as a novel radiosensitizing target in human cancers
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Abstract

Purpose: The identification of novel targets for developing synergistic drug-radiation combinations would pave the way to overcome tumor radioresistance. We conducted cell-based screening of a human kinome siRNA library to identify a radiation-specific kinase that has a synergistic toxic effect with radiation upon inhibition and is not essential for cell survival in the absence of radiation. Experimental Design: Unbiased RNAi screening was performed by transfecting A549 cells with a human kinome siRNA library followed by irradiation. Radiosensitizing effects of a target gene and involved mechanisms were examined. Results: We identified the non-receptor protein tyrosine kinase FES as a radiosensitizing target. The expression of FES was increased in response to irradiation. Cell viability and clonogenic survival after irradiation were significantly decreased by FES knockdown in lung and pancreatic cancer cell lines. In contrast, FES depletion alone did not significantly affect cell proliferation without irradiation. An inducible RNAi mouse xenograft model verified in vivo radiosensitizing effects. FES-depleted cells showed increased apoptosis, DNA damage, G2/M phase arrest, and mitotic catastrophe after irradiation. FES depletion promoted radiation-induced reactive oxygen species formation, which resulted in phosphorylation of S6K and MDM2. The radiosensitizing effect of FES knockdown was partially reversed by inhibition of S6K activity. Consistent with the increase in phosphorylated MDM2, an increase in nuclear p53 levels was observed, which appears to contribute increased radiosensitivity of FES-depleted cells. Conclusions: We uncovered that inhibition of FES could be a potential strategy for inducing radiosensitization in cancer. Our results provide the basis for developing novel radiosensitizers.

Keywords: Radiosensitization, FES, cancer

Category: Cancer Biology/Oncology
추천자 : 최근까지 한빛사 선정저널이었던 논문으로 연구자가 추천한 논문
등록일 2019.10.02
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