MITF suppression by CH5552074 inhibits cell growth in melanoma cells.

Abstract:

PURPOSE:Although treatment of melanoma with BRAF inhibitors and immune checkpoint inhibitors achieves a high response rate, a subset of melanoma patients with intrinsic and acquired resistance are insensitive to these therapeutics, so to improve melanoma therapy other target molecules need to be found. Here, we screened our chemical library to identify an anti-melanoma agent and examined its action mechanisms to show cell growth inhibition activity. METHODS:We screened a chemical library against multiple skin cancer cell lines and conducted ingenuity pathway analysis (IPA) to investigate the mechanisms of CH5552074 activity. Suppression of microphthalmia-associated transcription factor (MITF) expression levels was determined in melanoma cells treated with CH5552074. Cell growth inhibition activity of CH5552074 was evaluated in MITF-dependent melanoma cell lines. RESULTS:We identified an anti-melanoma compound, CH5552074, which showed remarkable cell growth inhibition activity in melanoma cell lines. The IPA results suggested that CH5552074-sensitive cell lines had activated MITF. In further in vitro studies in the melanoma cell lines, a knockdown of MITF with siRNA resulted in cell growth inhibition, which showed that CH5552074 inhibited cell growth by reducing the expression level of MITF protein. CONCLUSIONS:These results suggest that CH5552074 can inhibit cell growth in melanoma cells by reducing the protein level of MITF. MITF inhibition by CH5552074 would be an attractive option for melanoma treatment.

authors

Aida S,Sonobe Y,Yuhki M,Sakata K,Fujii T,Sakamoto H,Mizuno T

doi

10.1007/s00280-017-3317-6

subject

Has Abstract

pub_date

2017-06-01 00:00:00

pages

1187-1193

issue

6

eissn

0344-5704

issn

1432-0843

pii

10.1007/s00280-017-3317-6

journal_volume

79

pub_type

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