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Synergistic enhancement of anticancer therapeutic efficacy of HPMA copolymer doxorubicin conjugates via combination of ligand modification and stimuli-response srategies.

Abstract：

:N-(2-Hydroxypropyl) methacrylamide (HPMA) copolymer has been extensively studied as drug carrier for tumor therapy. Due to the Enhanced Permeability and Retention (EPR) effect, HPMA copolymer drug conjugates are able to be passively accumulated in the tumor site. Currently, efficient uptake of this polymeric system by the cancer cells remains a big challenge, as HPMA polymer is highly hydrophilic, neutrally charged, and has low affinity towards cell membrane. In this study, selective and enhanced intracellular internalization of the copolymer-drug conjugates was achieved by utilizing a hybrid strategy including ligand modification and stimuli response. This hybrid approach was rationally designed to comprise cationic HPMA copolymer backbone as drug carrier, doxorubicin (Dox) as model drug, hydrazone bond as drug spacer, FQSIYPpIK (FQS) peptide as αvβ3 targeting ligand and 2, 3-Dimethylmaleic Anhydride (DMA) as a shielded/deshielded cationic group. We demonstrated our system exhibited the "seek-and-destroy" tumor tropic behavior by sequentially undergoing the following steps: (i) tumor passive targeting mediated by EPR effect; (ii) charge reversal at tumor extracellular pH of 6.5; (iii) synergistically enhanced cell uptake via electrostatic interaction with cell membrane and FQS ligand-mediated bio-recognition; (iv) drug released in the lysosome; and v) anticancer effect exerted by the targeted delivery of the Dox.

journal_name

Int J Pharm

journal_title

International journal of pharmaceutics

authors

Li L,Zhou M,Huang Y

doi

10.1016/j.ijpharm.2017.12.018

subject

Has Abstract

pub_date

2018-01-30 00:00:00

pages

450-458

issue

1

eissn

0378-5173

issn

1873-3476

pii

S0378-5173(17)31161-4

journal_volume

536

pub_type

杂志文章

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