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Efficient and innocuous delivery of small interfering RNA to microglia using an amphiphilic dendrimer nanovector

Aleksandra Ellert-Miklaszewska1, Natalia Ochocka1, Marta Maleszewska1

  • 1Laboratory of Molecular Neurobiology, Neurobiology Center, Nencki Institute of Experimental Biology of the Polish Academy of Sciences, Warsaw, 02-093, Poland.

Nanomedicine (London, England)
|August 29, 2019
PubMed

Insights

Amphiphilic dendrimers (AD) offer a safe and effective method for delivering small interfering RNA (siRNA) into microglia. This novel approach enables gene knockdown in brain-resident macrophages without impacting their essential functions.

Area of Science:

  • Neuroscience
  • Biotechnology
  • Molecular Biology

Background:

  • Microglia, the brain's immune cells, are implicated in various neurological disorders.
  • Efficient genetic manipulation of microglia is crucial for understanding and treating brain diseases.
  • Current small interfering RNA (siRNA) delivery methods for microglia face challenges in safety and efficacy.

Purpose of the Study:

  • To evaluate the potential of amphiphilic dendrimers (AD) as a delivery vehicle for siRNA in primary microglia.
  • To assess the ability of AD to facilitate functional siRNA delivery and achieve gene knockdown in microglia.
  • To determine if AD-mediated siRNA delivery affects basal microglial functions.

Main Methods:

  • Characterization of AD-siRNA complex formation, including nanoparticle size and surface potential.
  • Assessment of cellular uptake of AD-siRNA nanoparticles in rodent microglia.
  • Quantification of gene and protein expression knockdown following siRNA delivery.
  • Transcriptomic analysis to identify global changes in microglial gene expression.

Main Results:

  • AD efficiently formed nanoparticles with siRNA.
  • Significant uptake of AD-siRNA nanoparticles by primary microglia was observed.
  • Effective reduction in target gene and protein expression was achieved.
  • Transcriptomic profiling revealed functional gene silencing without altering basal microglial functions.

Conclusions:

  • Amphiphilic dendrimers (AD) serve as a safe and effective carrier for siRNA delivery into microglia.
  • AD-mediated siRNA delivery enables targeted gene knockdown in microglia.
  • This technology holds promise for advancing research and therapeutic strategies in brain pathologies involving microglia.
Keywords:
amphiphilic dendrimerbasal microglial responsesdendrimer nanovectorgene silencingglioma-initiated responseinhibitor of differentiation Id1microglial functionnonviral vectorprimary microgliasiRNA delivery

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