Cellular uptake of ribonuclease A-functionalised core-shell silica microspheres

Chimonides, G.F, Behrendt, J.M., Chundoo, E., Bland, C., Hine, A.V., Devitt, A., Nagel, D.A. and Sutherland, A.J. (2014). Cellular uptake of ribonuclease A-functionalised core-shell silica microspheres. Journal of Materials Chemistry B, 2 (42), pp. 7307-7315.


Analysis of protein function in a cellular context ideally requires physiologically representative levels of that protein. Thus conventional nucleic acid-based transfection methods are far from ideal owing to the over expression that generally results. Likewise fusions with protein transduction domains can be problematic whilst delivery via liposomes/nanoparticles typically results in endosomal localisation. Recently polymer microspheres have been reported to be highly effective at delivering proteins into cells and thus provide a viable new alternative for protein delivery (protein transduction). Herein we describe the successful delivery of active ribonuclease A into HeLa cells via novel polymer core-silica shell microspheres. Specifically, poly(styrene-co-vinylbenzylisothiouronium chloride) core particles, generated by dispersion polymerisation, were coated with a poly(styrene-co-trimethoxysilylpropyl methacrylate) shell. The resultant core-shell morphology was characterised by transmission electron, scanning electron and fluorescence confocal microscopies, whilst size and surface charge was assessed by dynamic light scattering and zeta-potential measurements, respectively. Subsequently ribonuclease A was coupled to the microspheres using simple carbodiimide chemistry. Gel electrophoresis confirmed and quantified the activity of the immobilised enzyme against purified HeLa RNA. Finally, the polymer-protein particles were evaluated as protein-transduction vectors in vitro to deliver active ribonuclease A to HeLa cells. Cellular uptake of the microspheres was successful and resulted in reduced levels of both intracellular RNA and cell viability.

Publication DOI: https://doi.org/10.1039/C4TB01130A
Divisions: Engineering & Applied Sciences > Chemical engineering & applied chemistry
Life & Health Sciences
Life & Health Sciences > Applied Health Research Group
Life & Health Sciences > Biomedical Sciences research group
Life & Health Sciences > Biosciences
Engineering & Applied Sciences > Biomaterials Research Unit
Engineering & Applied Sciences > Advanced Materials Research Unit
Engineering & Applied Sciences > Polymer and advanced materials research group
Additional Information: This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Funding: EPSRC Industrial CASE (GFC) grant number EP/D038057/1 Electronic supplementary information: see DOI: 10.1039/c4tb01130a
Uncontrolled Keywords: Biomedical Engineering,Medicine(all),Chemistry(all),Materials Science(all)
Full Text Link: http://pubs.rsc.org/en/content/articlelanding/2014/tb/c4tb01130a#!divAbstract
Related URLs: http://www.scopus.com/inward/record.url?scp=84907942482&partnerID=8YFLogxK (Scopus URL)
Published Date: 2014-11-14
Authors: Chimonides, G.F
Behrendt, J.M.
Chundoo, E.
Bland, C.
Hine, A.V. ( 0000-0003-4065-831X)
Devitt, A. ( 0000-0002-4651-6761)
Nagel, D.A.
Sutherland, A.J. ( 0000-0003-3651-1809)



Version: Published Version

License: Creative Commons Attribution

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