Camptothecin and its analog SN-38, the active metabolite of irinotecan, inhibit binding of the transcriptional regulator and oncoprotein FUBP1 to its DNA target sequence FUSE.

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Khageh Hosseini S, Kolterer S, Steiner M, von Manstein V, Gerlach K, Trojan J, Waidmann O, Zeuzem S, Schulze JO, Hahn S, Steinhilber D, Gatterdam V, Tampe R, Biondi RM, Proschak E, Zornig M

Camptothecin and its analog SN-38, the active metabolite of irinotecan, inhibit binding of the transcriptional regulator and oncoprotein FUBP1 to its DNA target sequence FUSE.

Biochem Pharmacol. 2017 Dec 15;146:53-62. doi: 10.1016/j.bcp.2017.10.003. Epub 2017 Oct 13.

PubMed ID

29031818 [ View in PubMed

]

Abstract

The transcriptional regulator FUSE Binding Protein 1 (FUBP1) is overexpressed in more than 80% of all human hepatocellular carcinomas (HCCs) and other solid tumor entities including prostate and colorectal carcinoma. FUBP1 expression is required for HCC tumor cell expansion, and it functions as an important pro-proliferative and anti-apoptotic oncoprotein that binds to the single-stranded DNA sequence FUSE to regulate the transcription of a variety of target genes. In this study, we screened an FDA-approved drug library and discovered that the Topoisomerase I (TOP1) inhibitor camptothecin (CPT) and its derivative 7-ethyl-10-hydroxycamptothecin (SN-38), the active irinotecan metabolite that is used in the clinics in combination with other chemotherapeutics to treat carcinoma, inhibit FUBP1 activity. Both molecules prevent in vitro the binding of FUBP1 to its single-stranded target DNA FUSE, and they induce deregulation of FUBP1 target genes in HCC cells. Our results suggest the interference with the FUBP1/FUSE interaction as a further molecular mechanism that, in addition to the inactivation of TOP1, may contribute to the therapeutic potential of CPT/SN-38. Targeting of FUBP1 in HCC therapy with SN-38/irinotecan could be a particularly interesting option because of the high FUBP1 levels in HCC cells and their dependency on FUBP1 expression.

DrugBank Data that Cites this Article

Drugs

Sacituzumab govitecan

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Sacituzumab govitecan	Far upstream element-binding protein 1	Protein	Humans	Unknown	Inhibitor	Details