GADD45α sensitizes cervical cancer cells to radiotherapy via increasing cytoplasmic APE1 level.

GADD45α sensitizes cervical cancer cells to radiotherapy via increasing cytoplasmic APE1 level.
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DOI:
10.1038/s41419-018-0452-x
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发表时间:
2018-05-01
影响因子:
9
通讯作者:
Shan JL
Shan JL
中科院分区:
生物学1区
文献类型:
--
作者:
Li Q;Wei X;Zhou ZW;Wang SN;Jin H;Chen KJ;Luo J;Westover KD;Wang JM;Wang D;Xu CX;Shan JL

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放射抵抗仍然是宫颈癌治疗中的一个主要临床挑战。然而,宫颈癌放射抵抗发生的机制尚不清楚。在此,我们确定了在体外和体内,与放射敏感的宫颈癌相比,放射抵抗的宫颈癌中生长停滞和DNA损伤诱导蛋白45α(GADD45α)的表达减少。此外,沉默Gadd45DNA可以防止宫颈癌细胞遭受辐射诱导的α损伤、细胞周期停滞和细胞凋亡。更重要的是,我们的数据显示,Gadd45α的过表达显著增强了放射抵抗宫颈癌细胞的放射敏感性。这些数据表明,Gadd45α减少了ape1的胞浆分布,从而增强了宫颈癌细胞的放射敏感性。此外,我们发现Gadd45α通过抑制宫颈癌细胞内皮型一氧化氮合酶(ENOS)和诱导型一氧化氮合酶(INOS)来抑制一氧化氮(NO)的产生。综上所述,我们的研究结果表明,Gadd45α的低表达显著促进了放射抗性的形成,并且Gadd45α的异位表达增加了宫颈癌细胞对放射治疗的敏感性。Gadd45α通过抑制eNOS和iNOS,抑制NO调节的ape1的胞浆定位,从而增强宫颈癌细胞的放射敏感性。
Radioresistance remains a major clinical challenge in cervical cancer therapy. However, the mechanism for the development of radioresistance in cervical cancer is unclear. Herein, we determined that growth arrest and DNA-damage-inducible protein 45α (GADD45α) is decreased in radioresistant cervical cancer compared to radiosensitive cancer both in vitro and in vivo. In addition, silencing GADD45α prevents cervical cancer cells from undergoing radiation-induced DNA damage, cell cycle arrest, and apoptosis. More importantly, our data show that the overexpression of GADD45α significantly enhances the radiosensitivity of radioresistant cervical cancer cells. These data show that GADD45α decreases the cytoplasmic distribution of APE1, thereby enhancing the radiosensitivity of cervical cancer cells. Furthermore, we show that GADD45α inhibits the production of nitric oxide (NO), a nuclear APE1 export stimulator, by suppressing both endothelial NO synthase (eNOS) and inducible NO synthase (iNOS) in cervical cancer cells. In conclusion, our findings suggest that decreased GADD45α expression significantly contributes to the development of radioresistance and that ectopic expression of GADD45α sensitizes cervical cancer cells to radiotherapy. GADD45α inhibits the NO-regulated cytoplasmic localization of APE1 through inhibiting eNOS and iNOS, thereby enhancing the radiosensitivity of cervical cancer cells.
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