The present invention is directed to a method of modulating the expression of target genes nanoparticle composition and the release of cationic lipids for delivery of nucleic acids, as well as using them. In particular, cationic lipids containing an acid-labile linker, and the present invention is directed to nanoparticulate compositions containing them. None [Selection Figure]本発明は、核酸の送達のための放出性カチオン脂質及びナノ粒子組成物、並びにそれを用いて標的遺伝子の発現を調節する方法を対象とする。特に、本発明は、酸不安定性リンカーを含むカチオン脂質、及びそれを含有するナノ粒子組成物に関する。【選択図】なし