Synthesis and biological activity of phosphonoacetate- and thiophosphonoacetate-modified 2′-O-methyl oligoribonucleotides
作者:Richard N. Threlfall、Adrian G. Torres、Angelika Krivenko、Michael J. Gait、Marvin H. Caruthers
DOI:10.1039/c1ob06614e
日期:——
Chimeric 2â²-O-methyl oligoribonucleotides (2â²-OMe ORNs) containing internucleotide linkages which were modified with phosphonoacetate (PACE) or thiophosphonoacetate (thioPACE) were prepared by solid-phase synthesis. The modified 2â²-OMe ORNs contained a central phosphate or phosphorothioate sequence with up to 4 PACE or thioPACE modifications, respectively, at either end of the ORN in a âgapmerâ motif. Both PACE and thioPACE 2â²-OMe ORNs formed stable duplexes with complementary RNA. The majority of these duplexes had higher thermal melting temperatures than an unmodified RNA:RNA duplex. The modified 2â²-OMe ORNs were effective passenger strands with complementary, unmodified siRNAs, for inducing siRNA activity in a dual luciferase assay in the presence of a lipid transfecting agent. As single strands, thioPACE 2â²-OMe ORNs were efficiently taken up by HeLa cells in the absence of a lipid transfecting agent. Furthermore, thioPACE modifications greatly improved the potency of a 2â²-OMe phosphorothioate ORN as an inhibitor of microRNA-122 in Huh7 cells, without lipid transfection.
通过固相合成法制备了含有核苷酸内连接的嵌合 2â²-O-甲基寡核苷酸(2â²-OMe ORNs),这些嵌合寡核苷酸经磷酸乙酸酯(PACE)或硫代磷酸乙酸酯(thioPACE)修饰。经修饰的2â²-OMe ORN包含一个中心磷酸或硫代磷酸序列,在ORN的两端分别有多达4个PACE或thioPACE修饰,形成一个 "间隙 "图案。PACE 和 thioPACE 2â²-OMe ORN 都能与互补 RNA 形成稳定的双链体。与未修饰的 RNA:RNA 双链相比,这些双链中的大多数具有更高的热熔温度。修饰的 2-OMe ORN 与互补的、未修饰的 siRNA 是有效的客链,可在有脂质转染剂存在的双荧光素酶试验中诱导 siRNA 活性。作为单链,thioPACE 2â²-OMe ORNs 能在没有脂质转染剂的情况下被 HeLa 细胞有效吸收。此外,硫代PACE修饰大大提高了2â²-OMe硫代磷酸酯ORN在Huh7细胞中作为microRNA-122抑制剂的效力,而无需脂质转染。