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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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T14diLys/DOPE Liposomes: An Innovative Option for siRNA-Based Gene Knockdown?

Sophie Meinhard1, Frank Erdmann2,3, Henrike Lucas1,3

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|January 25, 2025
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Summary

Extrusion-produced liposomes offer superior properties for small interfering RNA (siRNA) delivery. An optimal nitrogen-to-phosphate (N/P) ratio of 5 demonstrated enhanced particle characteristics and gene silencing efficacy in vitro.

Keywords:
T14diLysextrusionionizable lipidlipoplexsiRNAtransfection

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Area of Science:

  • Biotechnology and Nanomedicine
  • Gene Therapy and Drug Delivery

Background:

  • Small interfering RNA (siRNA) delivery to the cell cytosol is crucial for gene silencing therapies but remains challenging.
  • Effective siRNA delivery requires complexation with cationic or ionizable compounds to protect siRNA and facilitate cell membrane penetration.

Purpose of the Study:

  • To evaluate the performance of the novel ionizable lipid T14diLys combined with DOPE for siRNA delivery.
  • To investigate the impact of liposome production methods (sonication vs. extrusion) on particle properties and siRNA delivery efficiency.

Main Methods:

  • Liposomes were prepared using either sonication or extrusion methods and subsequently characterized.
  • Liposomes were complexed with siRNA at various nitrogen-to-phosphate (N/P) ratios.
  • Evaluated parameters included particle size, zeta potential, encapsulation efficiency, lipoplex stability, and gene knockdown in eGFP-expressing cells.

Main Results:

  • Extrusion produced smaller liposomes with a narrower size distribution compared to sonication.
  • An N/P ratio of 5 yielded optimal particle properties, high encapsulation efficiency, and robust lipoplex stability.
  • In vitro gene knockdown assays confirmed the efficacy of siRNA delivery at the optimal N/P ratio.

Conclusions:

  • Extrusion is a reproducible method for producing liposomes with enhanced particle characteristics for siRNA delivery.
  • The optimal N/P ratio of 5 is critical for achieving efficient siRNA delivery and gene silencing.
  • The T14diLys/DOPE liposome system shows significant promise for therapeutic siRNA delivery applications.