Hypoxia-Responsive Polymeric Micelles for Enhancing Cancer Treatment.

Polymeric drug vectors have shown great potentials in cancer therapy. However, intelligent controlled release of drugs has become a major challenge in nanomedicine research. Hypoxia-responsive polymeric micelles have received widespread attention in recent years due to the inherent hypoxic state of tumor tissue. In this study, a novel diblock polymer consisting of polyethylene glycol and poly[glutamic acid (3-(2-nitro-imidazolyl)-propyl)] was synthesized and self-assembled into hypoxia-responsive polymeric micelles for the controlled release of doxorubicin (DOX). The cell experiments demonstrated that DOX-loaded micelles had a stronger killing capacity on tumor cells under hypoxic conditions, while the blank micelles had good biocompatibility. All the experiments indicate that our hypoxia-responsive polymeric micelles have a great potential for enhanced cancer treatment.