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Title: ヌクレアーゼ抵抗性化学修飾核酸の開発研究
Other Titles: Development of Highly Nuclease-resistant Chemically-modified Oligonucleotides
Authors: 松田, 彰1 Browse this author
Authors(alt): MATSUDA, Akira1
Keywords: nuclease
amino linker
radical cyclization
RNA interference
Issue Date: 2011
Publisher: 公益社団法人 日本薬学会
Volume: 131
Issue: 2
Start Page: 285
End Page: 298
Abstract:   Chemical modification of therapeutic oligodeoxyribonucleotides (ODNs) is necessary to avoid not only degradation by endo- and exo-nucleases but also recognition by sensors such as an innate immune system. We have been developing modified nucleosides having an aminoalky linker at the pyrimidine nucleobase or sugar moiety. ODNs containing 5-N-(6-aminohexyl)carbamoyl-2′-deoxyuridine (7) were thermally stabilized about 3°C per modification and were about 160 times more stable to hydrolysis by snake venom phosphodiesterase (a 3′-exonuclease) than unmodified ODNs, but not by endonucleases. On the other hand, ODNs containing 4′-C-(aminoethyl)thymidine (14b), which was synthesized by a newly developed radical cyclization-ring-enlargement reaction by us, were 87 times more stable to hydrolysis by DNase I (an endonuclease) and 133 times more stable in 50% human serum than unmodified ODNs. The highly stereoselective synthesis of 4′-thioribonuclesides (SNs) was also developed using a Pummerer reaction. Human thrombin RNA aptamer (CII-1-37) containing 4′-thiouridine and 4′-thiocytidine was obtained by SELEX with a Kd value of 4.7 nM, while a previously known RNA aptamer (RNA-24) has a Kd value of 85 nM. Studies of the modification pattern-RNAi activity relationships by using SNs have been carried out against luciferase genes. We found that siRNAs, which have 4 residues of SNs on both ends of the sense strand and 4 residues on the 3′-end of the antisense strand, were the most effective. 4′-ThioRNA is about 1100 times more stable in 50% human plasma than unmodified RNA. However, oligoribonucleotides (SMONs) containing 2′-O-methyl-4′-thioribonucleosides were 9800 times more stable in 50% human plasma than unmodified RNA. Since SMON duplexes were thermally more stable than unmodified ON duplexes, therefore they would be quite suitable to use for oligonucleotide therapeutics.
Type: article
Appears in Collections:薬学研究院 (Faculty of Pharmaceutical Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松田 彰

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