Synergistic effect of folate-conjugated thermosensitive polymers and 5-fluorouracil in the treatment of colon cancer

Abstract

Background: In recent years, targeted drug delivery strategies have received special attention from the scientifc world due to advantages such as more efective therapy and reduction of side efects. The principle of operation is delayed excretion from the bloodstream of the drug delivery system compared to the drug itself, as well as facilitated penetration into diseased cells thanks to the use of ligands recognized by appropriate receptors. Particularly interesting drug carriers are amphiphilic copolymers that form nano-sized micelles with a drug, which can release the drug at a specifc place in the body under the infuence of appropriate stimuli. Results: We describe the synthesis of the diblock polymer, poly(2-hydroxyethyl acrylate)-b-poly(N-vinylcaprolactam) using RAFT/MADIX (Reversible Addition-Fragmentation chain Transfer/MAcromolecular Design by Interchange of Xanthate) controlled polymerization afording polymers with good dispersity according to SEC (Size-Exclusion Chromatography). Some post-modifcations of the polymer with folic acid were then performed as evidenced by NMR (Nuclear Magnetic Resonance), UV–Vis (UltraViolet–Visible) and FT-IR (Fourier-Transform Infrared) spectroscopy, and TGA (ThermoGravimetricAnalysis). The formation of stable micellar systems from polymers with and without the drug, 5-fuorouracil, was confrmed by DLS (Dynamic Light Scattering) and zeta potential measurements, and TEM (Transmission Eelectron Microscopy) imaging. Finally, the cloud point of the polymers was investigated, which turned out to be close to the temperature of the human body. Most importantly, these micellar systems have been explored as a drug delivery system against colon cancer, showing increased cytotoxicity compared to the drug alone. This efect was achieved due to the easier cellular uptake by the interaction of folic acid and its receptors on the surface of cancer cells. Conclusions: The presented results constitute a solid foundation for the implementation of a nano-sized drug delivery system containing folic acid for practical use in the treatment of drug-resistant cancer, as well as more efective therapy with fewer side efects.