Chemotherapeutic drug delivery to cancer cells using a combination of folate targeting and tumor microenvironment-sensitive polypeptides.

Abstract:

:Chemotherapeutic agents often cause severe side effects because they produce a similar cytotoxicity in both cancerous and healthy cells. In this study, a rational strategy was implemented to take advantage of a combination of both tumor microenvironment-sensitive polypeptides (TMSP) and folate to create a more selective and efficient drug delivery system to target cancer cells. TMSP and folate were conjugated to the distal ends of DSPE-PEG2000-maleimide and DSPE-PEG5000-amine to create DSPE-PEG2000-TMSP and DSPE-PEG5000-folate, respectively, which were incorporated onto the surface of a docetaxel-loaded nanostructured lipid carrier (F/TMSP-DTX-NLC). TMSP are comprised of polycationic cell-penetrating peptides (CPP) and polyanionic inhibitory peptides, which are coupled via a proteinase-sensitive cleavable linker. The linker can be cleaved in the presence of matrix metalloprotease-2 and -9 (MMP-2/9). TMSP provides the ability to enhance specific cancer cellular uptake after selectively unmasking polyanionic inhibitory peptides in MMP-2/9 protease-oversecretion tumor tissue, whereas in circulation, the penetration is shielded. The folate moiety binds selectively to folate receptor-positive tumors. The cleaved dual-modified nanocarriers are then taken up by the tumor cells via both receptor-mediated endocytosis and CPP penetrating action to overcome the higher interstitial pressure in the tumor. The nanocarrier system demonstrated a small size, high encapsulation efficiency (>95%), sustained release and targeted delivery. The strong cellular uptake and cytotoxic activity of dual-modified F/TMSP-DTX-NLC in KB, HT-1080, MCF-7 and A549 cells verified the correlation with folate receptor expression and MMP-2/9 secretion. The remarkable penetration into KB and HT-1080 multicellular tumor spheroids confirmed that the temporary mask of the polyanionic inhibitory peptide in TMSP does not disturb the penetration ability of CPP in the tumor microenvironment with abundant proteases. Furthermore, the active targeting and triggered activation exhibited higher antitumor efficacy and lower systemic toxicity with the KB tumor model in nude mice compared to the nonmodified DTX-NLC and Taxotere(®). These results suggested that the application of combined TMSP and folate modifications may be an approach in the selectively targeted delivery of anticancer drugs with low systemic toxicity.

journal_name

Biomaterials

journal_title

Biomaterials

authors

Gao W,Xiang B,Meng TT,Liu F,Qi XR

doi

10.1016/j.biomaterials.2013.02.014

subject

Has Abstract

pub_date

2013-05-01 00:00:00

pages

4137-4149

issue

16

eissn

0142-9612

issn

1878-5905

pii

S0142-9612(13)00183-X

journal_volume

34

pub_type

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