Cited by 159RNA Interference and Gene DeliveryGenetic Neurodegenerative DiseasesDNA and Nucleic Acid Chemistry

Hydrophobically Modified siRNAs Silence Huntingtin mRNA in Primary Neurons and Mouse Brain

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Alterman, Julia F, Hall, Lauren M, Coles, Andrew H, Hassler, Matthew R, Didiot, Marie-Cecile, Chase, Kathryn, Abraham, Jasmin, Sottosanti, Emily +6 more·2015·Molecular Therapy - Nucleic Acids

Abstract

Applications of RNA interference for neuroscience research have been limited by a lack of simple and efficient methods to deliver oligonucleotides to primary neurons in culture and to the brain. Here, we show that primary neurons rapidly internalize hydrophobically modified siRNAs (hsiRNAs) added directly to the culture medium without lipid formulation. We identify functional hsiRNAs targeting the mRNA of huntingtin, the mutation of which is responsible for Huntington's disease, and show that direct uptake in neurons induces potent and specific silencing in vitro. Moreover, a single injection of unformulated hsiRNA into mouse brain silences Htt mRNA with minimal neuronal toxicity. Thus, hsiRNAs embody a class of therapeutic oligonucleotides that enable simple and straightforward functional studies of genes involved in neuronal biology and neurodegenerative disorders in a native biological context.

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Registry

Crossref · 10.1038/mtna.2015.38

Cites

57 of 57 references verified0 citation errors · 0 not checkable

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  • Such conjugated siRNAs are retained near the brain injection site, even with continuous monthly administration.

    “However, they are retained near the brain injection site, even with continuous monthly administration4, 7.”

    From A divalent siRNA chemical scaffold for potent and sustained modulation of gene expression throughout the central nervous system (2019) · cites this paper as [7]

    The Results section on mouse-brain distribution (page not provided) reports a steep fluorescence gradient from the injection site 24 hours after a single injection, with no fluorescence visually detectable on the opposite side. This supports limited distribution after one injection, but not retention during continuous monthly administration; the Materials and methods section describes single injections, not a monthly regimen. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • IBA-1 and GFAP are well-established markers of immune stimulation.

    “To evaluate the impact of Di-siRNA injection on microglia activation and gliosis, we measured two well-established markers of immune stimulation, IBA-1 and GFAP.”

    From A divalent siRNA chemical scaffold for potent and sustained modulation of gene expression throughout the central nervous system (2019) · cites this paper as [7]

    The Results section (page not provided) uses IBA-1-positive microglia to assess innate immune activation and says IBA-1 is upregulated after brain injury. The cited paper’s passages do not identify GFAP as a marker or use it to assess gliosis, so they support only the IBA-1 part of the claim. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • DARPP32 protein expression is an established marker for medium spiny neurons in the striatum.

    “To assess neuronal viability, we measured DARPP32 protein expression, an established marker for medium spiny neurons in the striatum7.”

    From A divalent siRNA chemical scaffold for potent and sustained modulation of gene expression throughout the central nervous system (2019) · cites this paper as [7]

    The Results section (page unavailable) calls DARPP-32 “an established marker for striatal neuron viability,” and Materials and methods describes counting DARPP-32-positive neurons in the striatum. Our copy does not identify those neurons specifically as medium spiny neurons, so that part of the claim is not supported. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Conjugating cholesterol to an siRNA generates steep concentration gradients around CSF-brain interfaces at the expense of delivery to deeper brain structures.

    “conjugating cholesterol to an siRNA promotes robust cellular association, but generates steep concentration gradients around CSF–brain interfaces at the expense of delivery to deeper brains structures [11].”

    From Elucidating brain transport pathways and cell type-dependent gene silencing of a durable lipid–siRNA conjugate administered into cerebrospinal fluid (2025) · cites this paper as [11]

    The Results section (‘hsiRNA distribution in vivo in mouse brain after intrastriatal injection’; page not provided) reports a steep fluorescence gradient from the injection site, with no visually detectable fluorescence on the opposite side. The paper does not place that gradient at a CSF–brain interface or establish that cholesterol conjugation caused reduced delivery to deeper brain structures. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Htt is a disease-relevant target that is ubiquitously expressed by CNS cells, and a well-validated siRNA sequence exists for it.

    “we chose Htt as a disease-relevant target that is ubiquitously expressed by CNS cells and for which a well-validated siRNA sequence exists (“Htt10150”) [11].”

    From Elucidating brain transport pathways and cell type-dependent gene silencing of a durable lipid–siRNA conjugate administered into cerebrospinal fluid (2025) · cites this paper as [11]

    The Introduction identifies Htt as the causative gene in Huntington’s disease. The Results (‘Potent and specific silencing with unformulated hsiRNAs in primary neurons’; page unavailable) show that HTT10150 silences Htt in primary neurons, and the in vivo Results report dose-dependent silencing in mouse brain. These passages support the disease relevance and validated siRNA sequence, but do not establish that Htt is ubiquitously expressed by CNS cells. (LLM, conf=0.87)

    Experimental — accuracy not yet measured

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Cites

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1 of the 58 references couldn’t be matched to a known paper.

Research works printed but not linked: 2

  1. Karra, D and Dahm, R (2010). Transfection techniques for neuronal cells. J Neurosci 30: 6171–6177. 20445041 PMC6632737
  2. Byrne, M, Tzekov, R, Wang, Y, Rodgers, A, Cardia, J, Ford, G et al. (2013). Novel hydrophobically modified asymmetric RNAi compounds (sd-rxRNA) demonstrate robust efficacy in the eye. J Ocul Pharmacol Ther 29: 855–864. 24180627

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Authors
Alterman, J. F., Hall, L. M., Coles, A. H., Hassler, M. R., Didiot, M.-C., Chase, K., Abraham, J., Sottosanti, E., Johnson, E., Sapp, E., Osborn, M. F., Difiglia, M., Aronin, N., & Khvorova, A.
Affiliations
  • University of Massachusetts Chan Medical School (US)
  • Massachusetts General Hospital (US)
Corresponding author
Khvorova, Anastasia
Venue
Molecular Therapy - Nucleic Acids
Publisher
Elsevier BV
Published
2015
Volume
4
Pages
e266
ISSN
2162-2531 (ISSN-L)
OpenAlex
W2295697145
Cited by
158
References
58
Citations by year
2026: 11 · 2025: 20 · 2024: 16 · 2023: 17 · 2022: 20 · 2021: 11 · 2020: 10 · 2019: 11 · 2018: 22 · 2017: 13 · 2016: 5 · 2015: 1 · 2013: 1
FWCI
5.94
Type
journal article
Language
en
Open access
Locations
  • Molecular Therapy — Nucleic Acids (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • eScholarship@UMassChan (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institutes of Health (UH2TR000888, 1s10od020012-01, UH3TR000888)
  • National Institute of General Medical Sciences (R01GM108803)
  • National Center for Advancing Translational Sciences
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
Keywords
siRNA delivery, primary neurons, RNA interference, Huntington's disease, oligonucleotide uptake, intracerebroventricular administration, neurodegenerative diseases, gene silencing

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