Novel Soluplus(®)-TPGS mixed micelles for encapsulation of paclitaxel with enhanced in vitro cytotoxicity on breast and ovarian cancer cell lines

Colloids and Surfaces. B, Biointerfaces
Ezequiel BernabeuDiego A Chiappetta

Abstract

The aim of this work was to develop mixed micelles based on two biocompatible copolymers of polyvinyl caprolactam-polyvinyl acetate-polyethylene glycol (Soluplus(®)) and D-α-tocopheryl polyethylene-glycol 1000 succinate (TPGS), to improve the aqueous solubility and the in vitro anti-tumor activity of paclitaxel (PTX). Pure and mixed nanomicelles were prepared by solvent evaporation method and characterized by transmission electron microscopy (TEM) and dynamic light scattering (DLS). Solubility of PTX was increased 60,000 and 38,000 times, when it was formulated in pure Soluplus(®) micelles and in mixed micelles (Soluplus(®):TPGS; 4:1 ratio), respectively. The in vitro PTX release profile from micellar systems was characterized employing the dialysis membrane method where all drug-loaded formulations showed a sustained and slow release of PTX. In vitro assays were conducted on human cancer cell lines including ovarian cancer cells SKOV-3, breast cancer cells MCF-7 and triple negative breast cancer cells MDA-MB-231. Cytotoxicity studies showed that mixed micelles exhibited better antitumor activity compared to PTX solution against the three cell lines. Furthermore mixed micelles showed a significant increase on PTX cellular uptak...Continue Reading

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