Methylation and loss of Secreted Frizzled-Related Protein 3 enhances melanoma cell migration and invasion.

Methylation and loss of Secreted Frizzled-Related Protein 3 enhances melanoma cell migration and invasion.
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分泌性卷曲相关蛋白 3 的甲基化和缺失可增强黑色素瘤细胞的迁移和侵袭。

DOI:
10.1371/journal.pone.0018674
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发表时间:
2011-04-08
期刊:
影响因子:
3.7
通讯作者:
Andersson T
Andersson T
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ekström EJ;Sherwood V;Andersson T

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Wnt信号传导在发育中很重要,也有助于癌症的发生和发展。分泌型卷曲相关蛋白(SFRPs)是Wnt信号转导的重要调节因子。在这里,我们研究SFRP 3在黑色素瘤中的表达和作用。我们发现,SFRP 3 mRNA在恶性黑色素瘤肿瘤中下调,与正常/良性组织相比。此外,我们发现SFRP 3表达在恶性黑色素瘤细胞系A2058、HTB 63和A375中丢失,但在非转化黑素细胞系爱马仕3A中不丢失。在黑色素瘤细胞系的SFRP 3基因中检测到甲基化的CpG富集区,并且使用去甲基化剂5′氮脱氧胞苷可以恢复其SFRP 3表达。向黑色素瘤细胞中添加重组SFRP 3对活细胞数没有影响,但降低了细胞迁移和侵袭。Wnt 5a信号传导已显示增加恶性黑素瘤细胞的迁移和侵袭,并且黑素瘤肿瘤中Wnt 5a的高表达与不良预后有关。我们发现重组SFRP 3可以抑制Wnt 5a信号传导,并且它以Wnt 5a依赖的方式抑制黑色素瘤细胞的迁移和侵袭。我们的结论是,SFRP 3的功能作为黑色素瘤迁移和侵袭抑制因子通过干扰Wnt 5a信号。
Wnt signaling is important in development and can also contribute to the initiation and progression of cancer. The Secreted Frizzled Related Proteins (SFRPs) constitute a family of Wnt modulators, crucial for controlling Wnt signaling. Here we investigate the expression and role of SFRP3 in melanoma. We show that SFRP3 mRNA is down-regulated in malignant melanoma tumors as compared to normal/benign tissue. Furthermore, we found that SFRP3 expression was lost in the malignant melanoma cell lines, A2058, HTB63 and A375, but not in the non-transformed melanocyte cell line, Hermes 3A. Methylated CpG rich areas were detected in the SFRP3 gene in melanoma cell lines and their SFRP3 expression could be restored using the demethylating agent, 5′aza-deoxycytidine. Addition of recombinant SFRP3 to melanoma cells had no effect on viable cell numbers, but decreased cell migration and invasion. Wnt5a signaling has been shown to increase the migration and invasion of malignant melanoma cells, and high expression of Wnt5a in melanoma tumors has been connected to a poor prognosis. We found that recombinant SFRP3 could inhibit Wnt5a signaling, and that it inhibited melanoma cell migration and invasion in a Wnt5a-dependent manner. We conclude that SFRP3 functions as a melanoma migration and invasion suppressor by interfering with Wnt5a signaling.
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