Biomarkers and mechanisms of FANCD2 function.

Biomarkers and mechanisms of FANCD2 function.
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DOI:
10.1155/2008/821529
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发表时间:
2008
影响因子:
--
通讯作者:
Powell SN
Powell SN
中科院分区:
其他
文献类型:
--
作者:
Willers H;Kachnic LA;Luo CM;Li L;Purschke M;Borgmann K;Held KD;Powell SN

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范可尼贫血(FA)和BRCA 1蛋白形成的途径的遗传或表观遗传失活发生在几种癌症类型中,使受影响的肿瘤对DNA交联剂和其他化疗药物可能过敏。有人提出,FA/BRCA缺陷细胞不能形成效应蛋白(如FANCD 2)的亚核病灶,可用作生物标志物,以帮助化疗的个体化。我们发现,FANCD 2失活不仅使细胞对交联敏感,而且对氧化应激敏感,这是癌症治疗的一种常见效应。氧化应激敏感性与FANCD 2或RAD 51灶形成无关,但与γ H2 AX灶水平增加和细胞凋亡相关。因此,FANCD 2可能通过不同的机制保护细胞免受交联和氧化应激,这与越来越多的观点一致,即该途径不是线性的。我们的数据强调需要多种生物标志物,如γ H2 AX,FANCD 2和RAD 51,以捕获所有途径活动。
Genetic or epigenetic inactivation of the pathway formed by the Fanconi anemia (FA) and BRCA1 proteins occurs in several cancer types, making the affected tumors potentially hypersensitive to DNA cross-linkers and other chemotherapeutic agents. It has been proposed that the inability of FA/BRCA-defective cells to form subnuclear foci of effector proteins, such as FANCD2, can be used as a biomarker to aid individualization of chemotherapy. We show that FANCD2 inactivation not only renders cells sensitive to cross-links, but also oxidative stress, a common effect of cancer therapeutics. Oxidative stress sensitivity does not correlate with FANCD2 or RAD51 foci formation, but associates with increased γH2AX foci levels and apoptosis. Therefore, FANCD2 may protect cells against cross-links and oxidative stress through distinct mechanisms, consistent with the growing notion that the pathway is not linear. Our data emphasize the need for multiple biomarkers, such as γH2AX, FANCD2, and RAD51, to capture all pathway activities.
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