» Articles » PMID: 32085572

Targeting the NPL4 Adaptor of P97/VCP Segregase by Disulfiram As an Emerging Cancer Vulnerability Evokes Replication Stress and DNA Damage While Silencing the ATR Pathway

Overview
Journal Cells
Publisher MDPI
Date 2020 Feb 23
PMID 32085572
Citations 23
Authors
Affiliations
Soon will be listed here.
Abstract

Research on repurposing the old alcohol-aversion drug disulfiram (DSF) for cancer treatment has identified inhibition of NPL4, an adaptor of the p97/VCP segregase essential for turnover of proteins involved in multiple pathways, as an unsuspected cancer cell vulnerability. While we reported that NPL4 is targeted by the anticancer metabolite of DSF, the bis-diethyldithiocarbamate-copper complex (CuET), the exact, apparently multifaceted mechanism(s) through which the CuET-induced aggregation of NPL4 kills cancer cells remains to be fully elucidated. Given the pronounced sensitivity to CuET in tumor cell lines lacking the genome integrity caretaker proteins BRCA1 and BRCA2, here we investigated the impact of NPL4 targeting by CuET on DNA replication dynamics and DNA damage response pathways in human cancer cell models. Our results show that CuET treatment interferes with DNA replication, slows down replication fork progression and causes accumulation of single-stranded DNA (ssDNA). Such a replication stress (RS) scenario is associated with DNA damage, preferentially in the S phase, and activates the homologous recombination (HR) DNA repair pathway. At the same time, we find that cellular responses to the CuET-triggered RS are seriously impaired due to concomitant malfunction of the ATRIP-ATR-CHK1 signaling pathway that reflects an unorthodox checkpoint silencing mode through ATR (Ataxia telangiectasia and Rad3 related) kinase sequestration within the CuET-evoked NPL4 protein aggregates.

Citing Articles

Dual-purposing disulfiram for enhanced chemotherapy and afterglow imaging using chlorin e6 and semiconducting polymer combined strategy.

Zhao D, Zhou A, Dong X, Meng H, He Y, Qu L Theranostics. 2024; 14(13):5141-5151.

PMID: 39267785 PMC: 11388071. DOI: 10.7150/thno.96136.


Characterizing replisome disassembly in human cells.

Jones R, Ruiz J, Scaramuzza S, Nath S, Liu C, Henklewska M iScience. 2024; 27(7):110260.

PMID: 39055910 PMC: 11269944. DOI: 10.1016/j.isci.2024.110260.


CuET overcomes regorafenib resistance by inhibiting epithelial-mesenchymal transition through suppression of the ERK pathway in hepatocellular carcinoma.

Ma D, Liu S, Liu K, He Q, Hu L, Shi W Transl Oncol. 2024; 47:102040.

PMID: 38954975 PMC: 11267041. DOI: 10.1016/j.tranon.2024.102040.


Valosin-Containing Protein (VCP): A Review of Its Diverse Molecular Functions and Clinical Phenotypes.

Pontifex C, Zaman M, D Fanganiello R, Shutt T, Pfeffer G Int J Mol Sci. 2024; 25(11).

PMID: 38891822 PMC: 11172259. DOI: 10.3390/ijms25115633.


Polydopamine-Modified Copper Coordination Mesoporous Silica Nanoparticles Loaded with Disulfiram for Synergistic Chemo-Photothermal Therapy.

Ling J, Cai Y, Feng H, Liu Z, Ouyang X Pharmaceutics. 2024; 16(4).

PMID: 38675173 PMC: 11054823. DOI: 10.3390/pharmaceutics16040512.


References
1.
Quinet A, Carvajal-Maldonado D, Lemacon D, Vindigni A . DNA Fiber Analysis: Mind the Gap!. Methods Enzymol. 2017; 591:55-82. DOI: 10.1016/bs.mie.2017.03.019. View

2.
Wang Y, Li W, Patel S, Cong J, Zhang N, Sabbatino F . Blocking the formation of radiation-induced breast cancer stem cells. Oncotarget. 2014; 5(11):3743-55. PMC: 4116517. DOI: 10.18632/oncotarget.1992. View

3.
Davis E, Lachaud C, Appleton P, Macartney T, Nathke I, Rouse J . DVC1 (C1orf124) recruits the p97 protein segregase to sites of DNA damage. Nat Struct Mol Biol. 2012; 19(11):1093-100. DOI: 10.1038/nsmb.2394. View

4.
Skrott Z, Majera D, Gursky J, Buchtova T, Hajduch M, Mistrik M . Disulfiram's anti-cancer activity reflects targeting NPL4, not inhibition of aldehyde dehydrogenase. Oncogene. 2019; 38(40):6711-6722. DOI: 10.1038/s41388-019-0915-2. View

5.
Toledo L, Altmeyer M, Rask M, Lukas C, Larsen D, Povlsen L . ATR prohibits replication catastrophe by preventing global exhaustion of RPA. Cell. 2013; 155(5):1088-103. DOI: 10.1016/j.cell.2013.10.043. View