A Combination of Epigenetic BET and CDK9 Inhibitors for Treatment of Human Melanoma

A Combination of Epigenetic BET and CDK9 Inhibitors for Treatment of Human Melanoma.

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Item Type: Article
Status: Published
Official URL: https://doi.org/10.1016/j.jid.2020.12.038
Journal or Publication Title: Journal of Investigative Dermatology
Volume: 141
Number: 9
Page Range: 2238-2249.e12
Date: September 2021
Divisions: Melanoma Epigenetics Laboratory
Melanoma Oncology and Immunology
Depositing User: General Admin
Identification Number: 10.1016/j.jid.2020.12.038
ISSN: 0022202X
Date Deposited: 10 Oct 2021 10:47

Dysregulation of epigenetic modifiers is a frequent event in melanoma and underlies many aspects of melanoma biology, including resistance to targeted therapy and immunotherapies. Here, we report that dual targeting of BET and CDK9 proteins have synergistic effects against melanoma cells in vitro and in vivo. The BET inhibitor (IBET151) and CDK9 inhibitor (CDKI73) synergistically killed melanoma cells in vitro independent of their BRAF or NRAS mutation status. The combination of drugs markedly inhibited the growth of human melanoma C002M cells in vitro in three-dimensional spheroids and in vivo in NOD-SCID gamma mice compared with vehicle control and the individual drugs (P < 0.05). Cell death was associated with mitochondrial depolarization, caspase-dependent apoptosis with cleavage of PARP1, and downregulation of anti-apoptotic proteins BCL2, BCLXL, and MCL1. Gene set enrichment analysis revealed downregulation of hallmark gene sets associated with E2F, G2M checkpoint, and c-MYC. Survival analysis showed worse prognosis with high G2M, E2F, or c-MYC gene signatures, suggesting biomarkers of response of BET and CDK9 inhibitors in melanoma. This combination of epigenetic inhibitors targets multiple downstream genes, leading to cell death of melanoma cells in vitro and in vivo, and warrants further investigation for treatment of melanoma in patients not responding to current therapies.

Copyright © 2021 The Authors. Published by Elsevier Inc. All rights reserved.

Emran, Abdullah Al
Tseng, Hsin-Yi
Gunatilake, Dilini
Cook, Stuart J.
Ahmed, Farzana
Wang, Shudong
Hersey, Peter
Gallagher, Stuart J.
Tiffen, Jessamy C.
Last Modified: 10 Oct 2021 10:47
URI: https://eprints.centenary.org.au/id/eprint/1075

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