Breast cancer metastasis suppressor 1 (BRMS1) inhibits osteopontin transcription by abrogating NF-kappaB activation.

Breast cancer metastasis suppressor 1 (BRMS1) inhibits osteopontin transcription by abrogating NF-kappaB activation.
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DOI:
10.1186/1476-4598-6-6
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发表时间:
2007-01-16
期刊:
影响因子:
37.3
通讯作者:
Shevde LA
Shevde LA
中科院分区:
医学1区
文献类型:
--
作者:
Samant RS;Clark DW;Fillmore RA;Cicek M;Metge BJ;Chandramouli KH;Chambers AF;Casey G;Welch DR;Shevde LA

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骨桥蛋白(OPN)是一种分泌型磷酸化糖蛋白,与肿瘤的进展和侵袭性肿瘤密切相关。MDA-MB-435细胞分泌非常高水平的OPN。然而,转移抑制MDA-MB-435细胞,转染乳腺癌转移抑制因子1(BRMS 1),表达OPN显着减少。BRMS 1是mSin 3-HDAC转录辅阻遏物复合物的成员,并且已经显示在动物模型中抑制乳腺癌和黑色素瘤细胞的转移。因此,我们假设BRMS 1调节OPN表达。利用荧光素酶报告基因检测OPN启动子缺失,在OPN启动子上寻找BRMS 1调控位点,发现了一个新的NF-κB位点(OPN/NF-κB)。电泳迁移率改变分析和染色质免疫沉淀(ChIP)证实该位点是NF-κ B结合位点。我们还发现HDAC 3通过OPN/NF-κB抑制OPN。我们的研究结果表明BRMS 1通过抑制NF-κB的活化来调节OPN的转录。因此,我们确定骨桥蛋白,肿瘤转移激活剂,作为一个关键的下游目标的BRMS 1。OPN的抑制可能是BRMS 1依赖性抑制肿瘤转移的潜在机制之一。
Osteopontin (OPN), a secreted phosphoglycoprotein, has been strongly associated with tumor progression and aggressive cancers. MDA-MB-435 cells secrete very high levels of OPN. However metastasis-suppressed MDA-MB-435 cells, which were transfected with breast cancer metastasis suppressor 1 (BRMS1), expressed significantly less OPN. BRMS1 is a member of mSin3-HDAC transcription co-repressor complex and has been shown to suppress the metastasis of breast cancer and melanoma cells in animal models. Hence we hypothesized that BRMS1 regulates OPN expression. The search for a BRMS1-regulated site on the OPN promoter, using luciferase reporter assays of the promoter deletions, identified a novel NF-κB site (OPN/NF-κB). Electrophoretic mobility shift assays and chromatin immunoprecipitations (ChIP) confirmed this site to be an NF-κB-binding site. We also show a role of HDAC3 in suppression of OPN via OPN/NF-κB. Our results show that BRMS1 regulates OPN transcription by abrogating NF-κB activation. Thus, we identify OPN, a tumor-metastasis activator, as a crucial downstream target of BRMS1. Suppression of OPN may be one of the possible underlying mechanisms of BRMS1-dependent suppression of tumor metastasis.
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