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Synthesis, Functionalization, and Characterization of Fusogenic Porous Silicon Nanoparticles for Oligonucleotide Delivery
Published on: April 16, 2019
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Maximizing RNA Loading for Gene Silencing Using Porous Silicon Nanoparticles
Terence Tieu1,2, Sameer Dhawan3, V Haridas3
1Monash Institute of Pharmaceutical Sciences , Monash University , Parkville Campus, 381 Royal Parade , Parkville , Victoria 3052 , Australia.
ACS Applied Materials & Interfaces
|June 30, 2019
Summary
Porous silicon nanoparticles effectively deliver gene-silencing RNA (siRNA) by protecting it from degradation. Surface modification with dendrimers and use of salt or urea significantly enhanced siRNA loading for potential cancer therapies.
Area of Science:
- Biotechnology
- Nanotechnology
- Molecular Biology
Background:
- Gene silencing using small interfering RNA (siRNA) is promising but limited by RNA instability and poor cellular delivery.
- Porous silicon nanoparticles offer a solution by protecting encapsulated RNA and facilitating cellular uptake.
Purpose of the Study:
- To investigate variables affecting siRNA loading into porous silicon nanoparticles.
- To optimize siRNA delivery using surface modifications and additives.
- To demonstrate the efficacy of functionalized nanoparticles in delivering siRNA for cancer treatment.
Main Methods:
- Investigated siRNA loading into porous silicon nanoparticles.
- Modified nanoparticle surfaces with amino-functional molecules, including polyamidoamine dendrimers.
- Examined the effects of salt and chaotropic agents (urea) on siRNA loading capacity.
- Demonstrated in vitro delivery of siRNA targeting ELOVL5.
Main Results:
- Maximum siRNA loading of 413 μg/(mg) achieved with fourth-generation dendrimer modification.
- Low concentrations of NaCl (0.05 M) and urea (0.25 M) increased RNA loading by 19% and 21%, respectively.
- Dendrimer-functionalized nanocarriers successfully delivered siRNA targeting ELOVL5.
Conclusions:
- Porous silicon nanoparticles, particularly when functionalized with dendrimers, are effective carriers for siRNA delivery.
- Optimized loading conditions using salt or urea enhance siRNA encapsulation efficiency.
- Dendrimer-modified nanoparticles show potential for targeted gene silencing in cancer therapy, specifically for ELOVL5 in prostate cancer.
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