Thermosensitive magnetic liposomes with doxorubicin cell-penetrating peptides conjugate for enhanced and targeted cancer therapy.

To specifically deliver cytotoxic drug to tumor cells and enhance cellular uptake is the key for effective cancer therapy. In this paper, we described a novel drug targeting system, which is designed to combine features of biological (cell-penetrating peptides, CPPs) and physical (magnetic) drug targeting for use in the magnetic hyperthermia-triggered release. A doxorubicin-CPPs conjugate (DOX-CPPs) was loaded into thermosensitive magnetic liposomes (TSMLs) (DOX-CPPs/TSMLs), and in vitro DOX-CPPs thermosensitive release activity, anti-proliferation effect, in vivo targeted delivery as well as in vivo antitumor activity were determined. The results demonstrated that the DOX-CPPs/TSMLs showed good physicochemical properties, effective anti-proliferation effect in MCF-7 cells in vitro. Additionally, in vivo study, DOX-CPPs/TSMLs under AC magnetic field displayed superior in vivo targeted delivery efficacy, antitumor efficacy in an MCF-7 xenograft murine model. In conclusion, the application of DOX-CPPs/TSMLs under AC magnetic field may provide a strategy for the selective and efficient delivery of drug.