Centrosome amplification induced by survivin suppression enhances both chromosome instability and radiosensitivity in glioma cells.

Centrosome amplification induced by survivin suppression enhances both chromosome instability and radiosensitivity in glioma cells.
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DOI:
10.1038/sj.bjc.6604160
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发表时间:
2008-01-29
影响因子:
8.8
通讯作者:
Kurisu, K.
Kurisu, K.
中科院分区:
医学1区
文献类型:
--
作者:
Saito, T.;Hama, S.;Izumi, H.;Yamasaki, F.;Kajiwara, Y.;Matsuura, S.;Morishima, K.;Hidaka, T.;Shrestha, P.;Sugiyama, K.;Kurisu, K.

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胶质母细胞瘤的特征是侵袭性生长和高度的放射抵抗性。存活素是一种染色体分离的调节因子,在人脑胶质瘤中高度表达,并已知其可诱导放射抗性。在这项研究中,我们研究了抑制生存素对恶性胶质瘤细胞放射敏感性的影响,同时关注中心体畸变和染色体不稳定性(CIN)。我们通过小干扰RNA转染抑制生存素,并使用克隆形成试验和台盼蓝排斥试验在U251 MG(p53突变型)和D54 MG(p53野生型)细胞中检测放射敏感性。为了评估CIN状态,我们使用免疫荧光分析确定了中心体的数量,并通过荧光原位杂交确定了着丝粒拷贝数。因此,放射增敏不同的关于p53的状态,作为U251 MG细胞迅速发展极端中心体扩增(=CIN),并提高放射敏感性,而中心体扩增和放射敏感性增加更逐渐在D54 MG细胞。TUNEL法显示抑制survivin并不导致照射后细胞凋亡。这种细胞死亡伴随着非整倍体程度的增加,表明有丝分裂细胞死亡。因此,抑制生存素可能是一个有吸引力的治疗目标,以克服放射抗性,而另外,适当注意CIN(中心体数目)被认为是重要的,以提高放射敏感性在人类胶质瘤。
Glioblastoma is characterised by invasive growth and a high degree of radioresistance. Survivin, a regulator of chromosome segregation, is highly expressed and known to induce radioresistance in human gliomas. In this study, we examined the effect of survivin suppression on radiosensitivity in malignant glioma cells, while focusing on centrosome aberration and chromosome instability (CIN). We suppressed survivin by small interfering RNA transfection, and examined the radiosensitivity using a clonogenic assay and a trypan blue exclusion assay in U251MG (p53 mutant) and D54MG (p53 wild type) cells. To assess the CIN status, we determined the number of centrosomes using an immunofluorescence analysis, and the centromeric copy number by fluorescence in situ hybridisation. As a result, the radiosensitisation differed regarding the p53 status as U251MG cells quickly developed extreme centrosome amplification (=CIN) and enhanced the radiosensitivity, while centrosome amplification and radiosensitivity increased more gradually in D54MG cells. TUNEL assay showed that survivin inhibition did not lead to apoptosis after irradiation. This cell death was accompanied by an increased degree of aneuploidy, suggesting mitotic cell death. Therefore, survivin inhibition may be an attractive therapeutic target to overcome the radioresistance while, in addition, proper attention to CIN (centrosome number) is considered important for improving radiosensitivity in human glioma.
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