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Nucleic Acids Research, 2003, Vol. 31, No. 3 953-962
© 2003 Oxford University Press

In vivo tumor growth inhibition and biodistribution studies of locked nucleic acid (LNA) antisense oligonucleotides

Kees Fluiter, Anneloor L. M. A. ten Asbroek, Marit B. de Wissel, Marja E. Jakobs, Margit Wissenbach1, Håkan Olsson1, Otto Olsen1, Henrik Oerum1 and Frank Baas*

Department of Neurogenetics, Academical Medical Center, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands and 1 Cureon A/S, Fruebjergvej 3, DK-2100 Copenhagen, Denmark

*To whom correspondence should be addressed. Tel: +31 20 5665998; Fax: +31 20 5669312; Email: f.baas{at}amc.uva.nl

Locked nucleic acids (LNA) are novel high-affinity DNA analogs that can be used as genotype-specific drugs. The LNA oligonucleotides (LNA PO ODNs) are very stable in vitro and in vivo without the need for a phosphorothiolated backbone. In this study we tested the biological fate and the efficacy in tumor growth inhibition of antisense oligonucleotides directed against the gene of the large subunit of RNA polymerase II (POLR2A) that are completely synthesized as LNA containing diester backbones. These full LNA oligonucleotides strongly reduce POLR2A protein levels. Full LNA PO ODNs appeared to be very stable compounds when injected into the circulation of mice. Full LNA PO ODNs were continuously administered for 14 days to tumor-bearing nude mice. Tumor growth was inhibited sequence specifically at dosages from 1 mg/kg/day. LNA PO ODNs appeared to be non-toxic at dosages <5 mg/kg/day. Biodistribution studies showed the kidneys to have the highest uptake of LNA PO ODNs and urinary secretion as the major route of clearance. This report shows that LNA PO ODNs are potent genotype-specific drugs that can inhibit tumor growth in vivo.


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