Characterization of multi-walled carbon nanotubes double-functionalization with cytostatic drug etoposide and phosphorothioate oligodeoxynucleotides

Carbon nanomaterials possess unique structural and physicochemical properties, and thus they are broadly utilized as carriers for a variety of therapeutic agents in nanomedicinal applications. Herein we present an electrochemical characterization of binding capability of acidic oxidized multi-walled carbon nanotubes (oMWCNTs) modified with poly(ethylene glycol) towards common cytostatic drug etoposide (or VP-16). The comparison of willingness of oMWCNTs and MWCNTs-PEG to form complexes with etoposide revealed significantly higher capacity in PEGylated variant of carbon nanotubes (the 15 mM etoposide loading capacity was approximately 46.4% in 2 mg of MWCNT-PEG or 28.1% in equal amount of oMWCNT). To obtain a multifunctional nanotransporter we employed the phosphorothioate oligodeoxynucleotide (PODN), which could further extend the possible biological effects of MWCNT-PEG-Etoposide complex. By using square wave voltammetry, the binding capacity of 2 mg of MWCNT-PEG-Etoposide (15 mM) towards PODNs was determined to be 4.5 mu M. Such characterized multifunctional complex can be further employed for biological testing on chemoresistant tumors, such as non-small-cell lung cancer, to enhance the treatment efficiency.

Keywords

Antisense oligodeoxynucleotides, Carbon nanomaterials, Electrochemistry, Nanotechnology, Poly(ethylene) glycol

Citation

INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE. 2015, vol. 10, issue 9, p. 7707-7719.
http://www.electrochemsci.org/papers/vol10/100907707.pdf

Document type

Peer-reviewed

Document version

Published version

Language of document

en

Document licence

Creative Commons Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/