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Cinobufagin Suppresses Melanoma Cell Growth by Inhibiting LEF1.

International journal of molecular sciences (2020-09-17)
Geon-Hee Kim, Xue-Quan Fang, Woo-Jin Lim, Jooho Park, Tae-Bong Kang, Ji Hyung Kim, Ji-Hong Lim
RÉSUMÉ

Constitutive activation of the β-catenin dependent canonical Wnt signaling pathway, which enhances tumor growth and progression in multiple types of cancer, is commonly observed in melanoma. LEF1 activates β-catenin/TCF4 transcriptional activity, promoting tumor growth and progression. Although several reports have shown that LEF1 is highly expressed in melanoma, the functional role of LEF1 in melanoma growth is not fully understood. While A375, A2058, and G361 melanoma cells exhibit abnormally high LEF1 expression, lung cancer cells express lower LEF1 levels. A luciferase assay-based high throughput screening (HTS) with a natural compound library showed that cinobufagin suppressed β-catenin/TCF4 transcriptional activity by inhibiting LEF1 expression. Cinobufagin decreases LEF1 expression in a dose-dependent manner and Wnt/β-catenin target genes such as Axin-2, cyclin D1, and c-Myc in melanoma cell lines. Cinobufagin sensitively attenuates cell viability and induces apoptosis in LEF1 expressing melanoma cells compared to LEF1-low expressing lung cancer cells. In addition, ectopic LEF1 expression is sufficient to attenuate cinobufagin-induced apoptosis and cell growth retardation in melanoma cells. Thus, we suggest that cinobufagin is a potential anti-melanoma drug that suppresses tumor-promoting Wnt/β-catenin signaling via LEF1 inhibition.

MATÉRIAUX
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Description du produit

Sigma-Aldrich
Quercetin, ≥95% (HPLC), solid
Sigma-Aldrich
Curcumin, from Curcuma longa (Turmeric), powder
Sigma-Aldrich
Resvératrol, ≥99% (HPLC)
Sigma-Aldrich
Actinomycin D, from Streptomyces sp., ~98% (HPLC)
Sigma-Aldrich
Silymarin, flavonolignans
Sigma-Aldrich
Wnt3A, human, recombinant, expressed in HEK 293 cells human
Sigma-Aldrich
Wortmannin, from Penicillium funiculosum, ≥98% (HPLC and TLC)
Cinobufagin, phyproof® Reference Substance