Estrogen receptor α (ERα) mediates 17β-estradiol (E2)-activated expression of HBO1.

Estrogen receptor α (ERα) mediates 17β-estradiol (E2)-activated expression of HBO1.
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雌激素受体 α (ERα) 介导 17β-雌二醇 (E2) 激活 HBO1 的表达

DOI:
10.1186/1756-9966-29-140
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发表时间:
2010-11-01
期刊:
Journal of experimental & clinical cancer research : CR
影响因子:
--
通讯作者:
Gu JX
Gu JX
中科院分区:
其他
文献类型:
--
作者:
Wang WZ;Liu HO;Wu YH;Hong Y;Yang JW;Liu YH;Wu WB;Zhou L;Sun LL;Xu JJ;Yun XJ;Gu JX

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HBO1(与ORC1结合的组蛋白乙酰转移酶)是一种组蛋白乙酰转移酶(HAT),它在乳腺癌中可能发挥致癌作用。然而,HBO1在乳腺癌中的生物学作用和潜在机制在很大程度上仍然未知。在当前的研究中,我们旨在探究HBO1在乳腺癌中的作用并揭示潜在的分子机制。 应用免疫组织化学方法检测乳腺癌标本(n = 112)中HBO1蛋白的表达。通过积分光密度(IOD)对蛋白水平的表达进行评分,以便使用SPSS进行进一步的统计分析。实时定量PCR用于同时测量HBO1的mRNA水平。通过蛋白质印迹法确认乳腺癌细胞中HBO1蛋白的表达。 HBO1在乳腺癌组织中高表达,并且与雌激素受体α(ERα)(p < 0.001)和孕激素(PR)(p = 0.002)显著相关。在ERα阳性肿瘤中,HBO1蛋白水平也与组织学分级呈正相关(p = 0.016),而在ERα阴性肿瘤中则无此相关性。17β - 雌二醇(E2)能够上调HBO1基因表达,而这种上调可被ICI 182,780或ERα RNA干扰显著抑制。在T47D和MCF - 7细胞中,用MEK1/2抑制剂(U0126)处理可显著抑制E2增加的HBO1蛋白表达。 HBO1是ERα的一个重要下游分子,并且ERK1/2信号通路可能参与E2增加的HBO1表达。
HBO1 (histone acetyltransferase binding to ORC1) is a histone acetyltransferase (HAT) which could exert oncogenic function in breast cancer. However, the biological role and underlying mechanism of HBO1 in breast cancer remains largely unknown. In the current study, we aimed to investigate the role of HBO1 in breast cancer and uncover the underlying molecular mechanism. Immunohistochemistry was applied to detect HBO1 protein expression in breast cancer specimens (n = 112). The expression of protein level was scored by integral optical density (IOD) for further statistical analyses using SPSS. Real-time PCR was used to simultaneously measure mRNA levels of HBO1. The HBO1 protein expression in breast cancer cells was confirmed by western blot. HBO1 was highly expressed in breast cancer tissues and significantly correlated with estrogen receptor α (ERα) (p < 0.001) and progestational hormone (PR) (p = 0.002). HBO1 protein level also correlated positively with histology grade in ERα positive tumors (p = 0.016) rather than ERα negative tumors. 17β-estradiol (E2) could upregulate HBO1 gene expression which was significantly inhibited by ICI 182,780 or ERα RNAi. E2-increased HBO1 protein expression was significantly suppressed by treatment with inhibitor of MEK1/2 (U0126) in T47 D and MCF-7 cells. HBO1 was an important downstream molecule of ERα, and ERK1/2 signaling pathway may involved in the expression of HBO1 increased by E2.
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