Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 19, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/ijms19071951
Keywords
telomeres; platinum complexes; cisplatin; G-quadruplex; TRF2
Funding
- National Center for Scientific Research (CNRS)
- French National Institute of Health and Medical Research (INSERM)
- Association pour la Recherche contre le Cancer (ARC) [4835]
- Institut National du Cancer INCA [2010-1-PLBIO 04-UP5-14835]
- Ligue Nationale contre le Cancer
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It is suggested that several compounds, including G-quadruplex ligands, can target telomeres, inducing their uncapping and, ultimately, cell death. However, it has never been demonstrated whether such ligands can bind directly and quantitatively to telomeres. Here, we employed the property of platinum and platinum-G-quadruplex complexes to target G-rich sequences to investigate and quantify their covalent binding to telomeres. Using inductively coupled plasma mass spectrometry, surprisingly, we found that, in cellulo, in the presence of cisplatin, a di-functional platinum complex, telomeric DNA was platinated 13-times less than genomic DNA in cellulo, as compared to in vitro data. On the contrary, the amount of mono-functional platinum complexes (Pt-ttpy and Pt-tpy) bound either to telomeric or to genomic DNA was similar and occurred in a G-quadruplex independent-manner. Importantly, the quantification revealed that the low level of cisplatin bound to telomeric DNA could not be the direct physical cause of TRF2 displacement from telomeres. Altogether, our data suggest that platinum complexes can affect telomeres both directly and indirectly.
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