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Zhang Y, Arrington L, Boardman D, Davis J, Xu Y, DiFelice K, Stirdivant S, Wang W, Budzik B, Bawiec J, Deng J, Beutner G, Seifried D, Stanton M, Gindy M, Leone A. The development of an in vitro assay to screen lipid based nanoparticles for siRNA delivery. J Control Release 2013; 174:7-14. [PMID: 24240015 DOI: 10.1016/j.jconrel.2013.11.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Revised: 10/13/2013] [Accepted: 11/04/2013] [Indexed: 12/12/2022]
Abstract
In order to rapidly screen and select lead candidates for in vivo evaluation of lipid nanoparticles (LNPs) for systemic small interfering RNA (siRNA) delivery, an in vitro assay amenable to high-throughput screening (HTS) is developed. The strategy is to mimic the in vivo experience of LNPs after systemic administration, such as interactions with serum components, exposure to endosomal pH environments, and interactions with endosomal membrane lipids. It is postulated that the amount of siRNA released from LNPs after going through these treatments can be used as a screening tool to rank order the effectiveness of siRNA delivery by lipid nanoparticles in vivo. LNPs were incubated with 50% serum from different species (i.e. mouse, rat, or rhesus) at 37°C. The resulting samples were then reacted with anionic, endosomal-mimicking lipids at different pHs. The amount of siRNA released from LNPs was determined using spectrophotometry employing the fluorescent indicator SYBR Gold. Our results indicated that the amount of siRNA liberated was highly dependent upon the species of serum used and the pH to which it was exposed. LNPs treated with mouse serum showed higher levels of siRNA release, as did those subjected to endosomal pH (6.0), compared to physiological pH. Most interestingly, a good correlation between the amount of siRNA released and the in vivo efficacy was observed. In conclusion, an in vitro siRNA release assay was developed to screen and rank order LNPs for in vivo evaluation.
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Affiliation(s)
- Ye Zhang
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA.
| | - Leticia Arrington
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA
| | - David Boardman
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA
| | - Jared Davis
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA
| | - Yan Xu
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA
| | - Katie DiFelice
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA
| | - Steve Stirdivant
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA
| | - Weimin Wang
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA
| | - Brian Budzik
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA
| | - Jack Bawiec
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA
| | - James Deng
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA
| | - Greg Beutner
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA
| | - Darla Seifried
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA
| | - Matthew Stanton
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA
| | - Marian Gindy
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA
| | - Anthony Leone
- Department of RNAi Therapeutics, Merck Research Laboratories, 770 Sumneytown Pike, West Point, 19486, USA
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