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RTL1 promotes melanoma proliferation by regulating Wnt/β-catenin signalling.

Oncotarget 2017 December 2
Cutaneous melanoma is a highly malignant and metastatic skin cancer with high mortality. However, its underlying mechanisms remain largely unclear. Here, we found that retrotransposon-like 1 (RTL1) is highly enriched in melanoma tissue, especially in early and horizontal growth tissues. Knockdown of RTL1 in melanoma cells resulted in cell proliferation suppression; cell cycle arrest at G1 phase; and down-regulation of E2F1, CYCLIN D1, cyclin-dependent kinase 6 (CDK6) and c-MYC. Moreover, overexpression of RTL1 in melanoma cells accelerated cell proliferation, promoted passage of the cell cycle beyond G1 phase, and increased the expression of cell cycle related genes. Mechanistically, we found that knockdown of RTL1 inhibited the Wnt/β-Catenin pathway by regulating the expression of genes specifically involved in β-CATENIN stabilization. Furthermore, the overexpression and knockdown of β-CATENIN rescued the effects of RTL1 on melanoma cell proliferation and the cell cycle. These findings were also confirmed via tumour xenografts in nude mice. Together, our results demonstrated that RTL1 promotes melanoma cell proliferation by regulating the Wnt/β-Catenin signalling pathway.

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