Highly efficient gene silencing activity of siRNA embedded in a nanostructured gyroid cubic lipid matrix.

Highly efficient gene silencing activity of siRNA embedded in a nanostructured gyroid cubic lipid matrix.
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DOI:
10.1021/ja1059763
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发表时间:
2010-12-01
影响因子:
15
通讯作者:
Safinya CR
Safinya CR
中科院分区:
化学1区
文献类型:
--
作者:
Leal C;Bouxsein NF;Ewert KK;Safinya CR

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RNA interference (RNAi) is an evolutionarily conserved sequence-specific post-transcriptional gene silencing pathway with wide-ranging applications in functional genomics, therapeutics, and biotechnology. Cationic liposome-small interfering RNA (CL-siRNA) complexes have emerged as vectors of choice for delivery of siRNA, which mediates RNAi. However, siRNA delivery by CL-siRNA complexes is often inefficient and accompanied by lipid toxicity. We report the development of CL-siRNA complexes with a novel cubic phase nanostructure, which exhibit efficient silencing at low toxicity. The inverse bicontinuous gyroid cubic nanostructure was unequivocally derived by synchrotron X-ray scattering, while fluorescence microscopy revealed co-localization of lipid and siRNA in complexes. We attribute the efficient silencing to enhanced fusion of complex and endosomal membranes, facilitated by the cubic phase membrane’s positive Gaussian modulus which may enable spontaneous formation of transient pores. The findings underscore the importance of understanding membrane-mediated interactions between CL-siRNA complex nanostructure and cell components in developing CL-based gene silencing vectors.
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