Disabling c-Myc in childhood medulloblastoma and atypical teratoid/rhabdoid tumor cells by the potent G-quadruplex interactive agent S2T1-6OTD

Shalaby, Tarek; von Bueren, André O; Hürlimann, Marie-Louise; Fiaschetti, Giulio; Castelletti, Deborah; Masayuki, Tera; Nagasawa, Kazuo; Arcaro, Alexandre; Jelesarov, Ilian; Shin-ya, Kazuo; Grotzer, Michael (2010). Disabling c-Myc in childhood medulloblastoma and atypical teratoid/rhabdoid tumor cells by the potent G-quadruplex interactive agent S2T1-6OTD. Molecular cancer therapeutics, 9(1), pp. 167-79. Philadelphia, Pa.: American Association for Cancer Research AACR 10.1158/1535-7163.MCT-09-0586

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We investigated here the effects of S2T1-6OTD, a novel telomestatin derivative that is synthesized to target G-quadruplex-forming DNA sequences, on a representative panel of human medulloblastoma (MB) and atypical teratoid/rhabdoid (AT/RT) childhood brain cancer cell lines. S2T1-6OTD proved to be a potent c-Myc inhibitor through its high-affinity physical interaction with the G-quadruplex structure in the c-Myc promoter. Treatment with S2T1-6OTD reduced the mRNA and protein expressions of c-Myc and hTERT, which is transcriptionally regulated by c-Myc, and decreased the activities of both genes. In remarkable contrast to control cells, short-term (72-hour) treatment with S2T1-6OTD resulted in a dose- and time-dependent antiproliferative effect in all MB and AT/RT brain tumor cell lines tested (IC(50), 0.25-0.39 micromol/L). Under conditions where inhibition of both proliferation and c-Myc activity was observed, S2T1-6OTD treatment decreased the protein expression of the cell cycle activator cyclin-dependent kinase 2 and induced cell cycle arrest. Long-term treatment (5 weeks) with nontoxic concentrations of S2T1-6OTD resulted in a time-dependent (mainly c-Myc-dependent) telomere shortening. This was accompanied by cell growth arrest starting on day 28 followed by cell senescence and induction of apoptosis on day 35 in all of the five cell lines investigated. On in vivo animal testing, S2T1-6OTD may well represent a novel therapeutic strategy for childhood brain tumors.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine
UniBE Contributor:	Arcaro, Alexandre
ISSN:	1535-7163
Publisher:	American Association for Cancer Research AACR
Language:	English
Submitter:	Anette van Dorland
Date Deposited:	04 Oct 2013 14:13
Last Modified:	05 Dec 2022 14:02
Publisher DOI:	10.1158/1535-7163.MCT-09-0586
PubMed ID:	20053783
Web of Science ID:	000278405000015
URI:	https://boris.unibe.ch/id/eprint/2824 (FactScience: 205743)