Site-Specific Drug-Releasing Polypeptide Nanocarriers Based on Dual-pH Response for Enhanced Therapeutic Efficacy against Drug-Resistant Tumors.

Abstract

To enhance effective drug accumulation in drug-resistant tumors, a site-specific drug-releasing polypeptide system (PEG-Phis/Pasp-DOX/CA4) was exploited in response to tumor extracellular and intracellular pH. This system could firstly release the embedded tumor vascular inhibitor (CA4) to transiently 'normalize' vasculature and facilitate drug internalization to tumors efficiently, and then initiate the secondary pH-response to set the conjugated active anticancer drug (DOX) free in tumor cells. The encapsulated system (PEG-Phis/DOX/CA4), both CA4 and DOX embedding in the nanoparticles, was used as a control. Comparing with PEG-Phis/DOX/CA4, PEG-Phis/Pasp-DOX/CA4 exhibited enhanced cytotoxicity against DOX-sensitive and DOX-resistant cells (MCF-7 and MCF-7/ADR). Moreover, PEG-Phis/Pasp-DOX/CA4 resulted in enhanced therapeutic efficacy in drug-resistant tumors with reduced toxicity. These results suggested that this site-specific drug-releasing system could be exploited as a promising treatment for cancers with repeated administration.

• Authors: Yaqiong Dong, Jun Yang, Hongmei Liu, Tianyou Wang, Suoqin Tang, Jinchao Zhang, Xin Zhang
• Journal: Theranostics (Theranostics) Vol. 5 Issue 8 Pg. 890-904 ( 2015) ISSN: 1838-7640 [Electronic] Australia
• PMID: 26000060 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Antineoplastic Agents
• Drug Carriers
• Peptides
• Stilbenes
• Doxorubicin
• fosbretabulin

Topics

• Animals
• Antineoplastic Agents (pharmacokinetics, pharmacology)
• Cell Line, Tumor
• Doxorubicin (pharmacokinetics, pharmacology)
• Drug Carriers (metabolism)
• Drug Resistance
• Female
• Humans
• Hydrogen-Ion Concentration
• Mice, Inbred BALB C
• Mice, Inbred ICR
• Molecular Medicine (methods)
• Neoplasms (drug therapy)
• Peptides (metabolism)
• Stilbenes (pharmacokinetics, pharmacology)