Gene Silencing in a Mouse Lung Metastasis Model by an Inhalable Dry Small Interfering RNA Powder Prepared Using the Supercritical Carbon Dioxide Technique
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- Okuda Tomoyuki
- Faculty of Pharmacy, Meijo University
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- Kito Daisuke
- Faculty of Pharmacy, Meijo University
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- Oiwa Ai
- Faculty of Pharmacy, Meijo University
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- Fukushima Michiko
- Faculty of Pharmacy, Meijo University
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- Hira Daiki
- Faculty of Pharmacy, Meijo University
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- Okamoto Hirokazu
- Faculty of Pharmacy, Meijo University
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In this study, a novel dry small interfering RNA (siRNA) powder for inhalation, containing chitosan and mannitol, was prepared using the supercritical carbon dioxide (CO2) technique. Although the siRNA/chitosan powder was difficult to disperse because of a long needle-like structure, it could be reduced to fragments of 10–20 µm by manual grinding, which allowed for administration into mice. Electrophoresis revealed that the supercritical CO2 technique and manual grinding didn’t greatly affect the integrity of the siRNA. Furthermore, the siRNA was more stable in the lungs than in blood, suggesting the utility of pulmonary delivery. Biodistribution experiments using Cy5.5-labeled siRNA demonstrated that pulmonary administration of the powder achieved a prolonged exposure of the siRNA/chitosan complex on the lung epithelial surface at a higher concentration. For the evaluation of the in-vivo gene silencing effect of the siRNA/chitosan powder, mice bearing colon26/Luc cells were used. The powder significantly inhibited the increase in luminescence intensity in the lungs, but the siRNA/chitosan solution and a non-specific dry siRNA/chitosan powder didn't, indicating the effective and specific gene silencing against the tumor cells metastasized in the lungs of mice by the siRNA/chitosan powder. These results strongly indicate that inhalable dry siRNA powders have the possibility of effective pulmonary gene silencing and that the supercritical CO2 technique can be applied to the production.
収録刊行物
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- Biological & Pharmaceutical Bulletin
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Biological & Pharmaceutical Bulletin 36 (7), 1183-1191, 2013
公益社団法人 日本薬学会
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詳細情報 詳細情報について
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- CRID
- 1390001204632560512
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- NII論文ID
- 130003361478
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- NII書誌ID
- AA10885497
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- COI
- 1:STN:280:DC%2BC3sjmsVKltg%3D%3D
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- ISSN
- 13475215
- 09186158
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- NDL書誌ID
- 024644748
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- PubMed
- 23811567
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可