Beta-catenin inhibits melanocyte migration but induces melanoma metastasis.

Beta-catenin inhibits melanocyte migration but induces melanoma metastasis.
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DOI:
10.1038/onc.2012.229
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发表时间:
2013-04-25
期刊:
影响因子:
8
通讯作者:
Larue, L.
Larue, L.
中科院分区:
医学1区
文献类型:
--
作者:
Gallagher, S. J.;Rambow, F.;Kumasaka, M.;Champeval, D.;Bellacosa, A.;Delmas, V.;Larue, L.

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经典Wnt信号通路诱导β-catenin/LEF转录因子。它在各种癌症中被激活,最典型的是癌,其中它通过增加迁移和/或侵袭促进转移性扩散。Wnt/β-catenin信号通路在黑色素瘤中经常被激活,但β-catenin在细胞核中的存在似乎不是这些肿瘤侵袭性的标志。我们发现,β-catenin信号传导与其在刺激癌细胞迁移和侵袭中的积极作用不同,它降低了黑素细胞和黑色素瘤细胞系的迁移。在体内,成黑素细胞中的β-连环蛋白信号减少了这些细胞的迁移,导致了白色腹斑表型。β-连环蛋白对迁移的抑制依赖于MITF-M(黑素细胞谱系的关键转录因子)和CSK(Src抑制剂)。尽管减少了迁移,但β-连环蛋白信号传导促进了Nras驱动的黑色素瘤小鼠模型中的肺转移。因此,β-连环蛋白可能在黑色素瘤的转移扩散中发挥相互矛盾的作用,抑制迁移,同时促进转移。这些结果强调了转移形成需要一系列成功的细胞过程,其中任何一个都可能不是最有效的。
The canonical Wnt signalling pathway induces the β-catenin/LEF transcription factors. It is activated in various cancers, most characteristically carcinomas, in which it promotes metastatic spread by increasing migration and/or invasion. The Wnt/β-catenin signalling pathway is frequently activated in melanoma, but the presence of β-catenin in the nucleus does not seem to be a sign of aggressiveness in these tumours. We found that, unlike its positive role in stimulating migration and invasion of carcinoma cells, β-catenin signalling decreased the migration of melanocytes and melanoma cell lines. In vivo, β-catenin signalling in melanoblasts reduced the migration of these cells, causing a white belly-spot phenotype. The inhibition, by β-catenin of migration was dependent on MITF-M, a key transcription factor of the melanocyte lineage, and CSK, a Src-inhibitor. Despite reducing migration, β-catenin signalling promoted lung metastasis in the Nras-driven melanoma murine model. Thus, β-catenin may play conflicting roles in the metastatic spread of melanoma, repressing migration while promoting metastasis. These results highlight that metastasis formation requires a series of successful cellular processes, any one of which may not be optimally efficient.
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