Evolution of the structure of lipid nanoparticles for nucleic acid delivery: from in situ studies of formulation to colloidal stability
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Date
2024-04-15
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
The development of lipid nanoparticle (LNP) based therapeutics for delivery of RNA has triggered the advance of new strategies for formulation, such as high throughput microfluidics for precise mixing of components into well-defined particles. In this study, we have characterised the structure of LNPs throughout the formulation process using in situ small angle x-ray scattering in the microfluidic chip, then by sampling in the subsequent dialysis process. The final formulation was investigated with small angle x-ray (SAXS) and neutron (SANS) scattering, dynamic light scattering (DLS) and cryo-TEM. The effect on structure was investigated for LNPs with a benchmark lipid composition and containing different cargos: calf thymus DNA (DNA) and two model mRNAs, polyadenylic acid (polyA) and polyuridylic acid (polyU). The LNP structure evolved during mixing in the microfluidic channel, however was only fully developed during the dialysis. The colloidal stability of the final formulation was affected by the type of incorporated nucleic acids (NAs) and decreased with the degree of base-pairing, as polyU induced extensive particle aggregation. The main NA LNP peak in the SAXS data for the final formulation were similar, with the repeat distance increasing from polyU<polyA<DNA, following the expected extent of base-pairing. © 2023 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY license.
Description
Keywords
Lipids, Nanoparticles, Nucleic acids, Colloids, Stability, Therapeutic uses, RNA, Small angle scattering, Neutron diffraction, Transmission electron microscopy
Citation
Gilbert, J., Sebastiani, F., Yanez Arteta, M., Terry, A., Fornell, A., Russell, R., Mahmoudi, N., & Nylander, T. (2024). Evolution of the structure of lipid nanoparticles for nucleic acid delivery: from in situ studies of formulation to colloidal stability. Journal of Colloid and Interface Science, 660, 66-76. doi:10.1016/j.jcis.2023.12.165