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多功能蛋白聚糖启动子的结构与调控:多功能蛋白聚糖启动子在侵袭性人黑素瘤细胞中受AP-1和TCF转录因子调控。

Structure and regulation of the versican promoter: the versican promoter is regulated by AP-1 and TCF transcription factors in invasive human melanoma cells.

作者信息

Domenzain-Reyna Clelia, Hernández Daniel, Miquel-Serra Laia, Docampo María José, Badenas Celia, Fabra Angels, Bassols Anna

机构信息

Departament de Bioquímica i Biologia Molecular, Facultat de Veterinària, Universitat Autònoma de Barcelona, 08193 Barcelona, Spain.

出版信息

J Biol Chem. 2009 May 1;284(18):12306-17. doi: 10.1074/jbc.M807108200. Epub 2009 Mar 6.

Abstract

Versican is a large chondroitin sulfate proteoglycan of the extracellular matrix that is involved in a variety of cellular processes. We showed previously that versican, which is overexpressed in cutaneous melanomas as well as in premalignant lesions, contributes to melanoma progression, favoring the detachment of cells and the metastatic dissemination. Here, we investigated the transcriptional regulation of the versican promoter in melanoma cell lines with different levels of biological aggressiveness and stages of differentiation. We show that versican promoter up-regulation accounts for the differential expression levels of mRNA and protein detected in the invasive SK-mel-131 human melanoma cells. The activity of the versican promoter increased 5-fold in these cells in comparison with that measured in non-invasive MeWo melanoma cells. Several transcriptional regulatory elements were identified in the proximal promoter, including AP-1, Sp1, AP-2, and two TCF-4 sites. We show that promoter activation is mediated by the ERK/MAPK and JNK signaling pathways acting on the AP-1 site, suggesting that BRAF mutation present in SK-mel-131 cells impinge upon the up-regulation of the versican gene through signaling elicited by the ERK/MAPK pathway. This is the first time the AP-1 transcription factor family has been shown to be related to the regulation of versican expression. Furthermore, deletion of the TCF-4 binding sites caused a 60% decrease in the promoter activity in SK-mel-131 cells. These results showing that AP-1 and TCF-4 binding sites are the main regulatory regions directing versican production provide new insights into versican promoter regulation during melanoma progression.

摘要

多功能蛋白聚糖是细胞外基质中的一种大型硫酸软骨素蛋白聚糖,参与多种细胞过程。我们之前表明,多功能蛋白聚糖在皮肤黑色素瘤以及癌前病变中过度表达,它有助于黑色素瘤的进展,促进细胞脱离和转移扩散。在此,我们研究了在具有不同生物学侵袭性水平和分化阶段的黑色素瘤细胞系中多功能蛋白聚糖启动子的转录调控。我们发现多功能蛋白聚糖启动子的上调解释了在侵袭性人黑色素瘤SK-mel-131细胞中检测到的mRNA和蛋白质的差异表达水平。与非侵袭性MeWo黑色素瘤细胞相比,这些细胞中多功能蛋白聚糖启动子的活性增加了5倍。在近端启动子中鉴定出了几个转录调控元件,包括AP-1、Sp1、AP-2和两个TCF-4位点。我们表明启动子激活是由作用于AP-1位点的ERK/MAPK和JNK信号通路介导的,这表明SK-mel-131细胞中存在的BRAF突变通过ERK/MAPK通路引发的信号影响多功能蛋白聚糖基因的上调。这是首次表明AP-1转录因子家族与多功能蛋白聚糖表达的调控有关。此外,删除TCF-4结合位点导致SK-mel-131细胞中启动子活性降低60%。这些结果表明AP-1和TCF-4结合位点是指导多功能蛋白聚糖产生的主要调控区域,为黑色素瘤进展过程中多功能蛋白聚糖启动子调控提供了新的见解。

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