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Nucleic Acids Research, 2003, Vol. 31, No. 8 2097-2107
© 2003 Oxford University Press

Biophysical and biological properties of quadruplex oligodeoxyribonucleotides

Virna Dapic, Vedra Abdomerovic, Rachel Marrington1, Jemma Peberdy1, Alison Rodger1, John O. Trent and Paula J. Bates

Department of Medicine, James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40202, USA and 1 Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK

Correspondence may also be addressed to John O. Trent. Tel: +1 502 852 2194; Fax: +1 502 852 2195; Email: john.trent{at}louisville.edu

Single-stranded guanosine-rich oligodeoxyribonucleotides (GROs) have a propensity to form quadruplex structures that are stabilized by G-quartets. In addition to intense speculation about the role of G-quartet formation in vivo, there is considerable interest in the therapeutic potential of quadruplex oligonucleotides as aptamers or non-antisense antiproliferative agents. We previously have described several GROs that inhibit proliferation and induce apoptosis in cancer cell lines. The activity of these GROs was related to their ability to bind to a specific cellular protein (GRO-binding protein, which has been tentatively identified as nucleolin). In this report, we describe the physical properties and biological activity of a group of 12 quadruplex oligonucleotides whose structures have been characterized previously. This group includes the thrombin-binding aptamer, an anti-HIV oligonucleotide, and several quadruplexes derived from telomere sequences. Thermal denaturation and circular dichroism (CD) spectropolarimetry were utilized to investigate the stability, reversibility and ion dependence of G-quartet formation. The ability of each oligonucleotide to inhibit the proliferation of cancer cells and to compete for binding to the GRO-binding protein was also examined. Our results confirm that G-quartet formation is essential for biological activity of GROs and show that, in some cases, quadruplex structures formed in the presence of potassium ions are significantly more active than those formed in the presence of sodium ions. However, not all quadruplex structures exhibit antiproliferative effects, and the most accurate factor in predicting biological activity was the ability to bind to the GRO-binding protein. Our data also indicate that the CD spectra of quadruplex oligonucleotides may be more complex than previously thought.


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