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Nanocarriers responsive to a hypoxia gradient facilitate enhanced tumor penetration and improved anti-tumor efficacy
- Source :
- Biomaterials science. 7(7)
- Publication Year :
- 2019
-
Abstract
- Because of their abnormal vasculature and the dense tumor extra-cellular matrix, solid tumors prevent the deep and uniform penetration of nanocarriers. Numerous studies have shown that nanocarriers with a positively charged surface exhibit enhanced tumor penetration. Therefore, a hypoxia responsive nanocarrier [responsive micelles (RMs)] was developed, which can gradually increase the positive surface charge by responding to hypoxia gradients, and eventually achieve deep penetration in tumors. The nanocarrier was composed of a poly(caprolactone) core and a mixed shell of poly(ethylene glycol) (PEG) and 4-nitrobenzyl chloroformate (NBCF)-modified polylysine (PLL). During the blood circulation, the NBCF-modified PLL was shielded by the PEG, which gave it the ability to inhibit its rapid removal by the immune system. After reaching the tumor, the hypoxia microenvironment triggered partial NBCF degradation that recovered the amine groups of PLL, leading to a remarkable change in the surface to a positively charged one that enabled the penetration of the nanocarrier into the tumor. As the nanocarrier penetrated into the interior of the tumor, the decrease in oxygen concentration led to the further degradation of the NBCF-modified PLL, resulting in the increase of the positive surface charge which further facilitated the deep penetration. The subsequent in vitro and in vivo experiments certified that RM/doxorubicin had a better penetration ability and improved inhibition efficacy on tumor tissues, which demonstrated its potential application in cancer therapy.
- Subjects :
- Polymers
Biomedical Engineering
Antineoplastic Agents
Micelle
chemistry.chemical_compound
Mice
In vivo
Cell Line, Tumor
PEG ratio
medicine
Animals
Humans
General Materials Science
Doxorubicin
Tissue Distribution
Particle Size
Micelles
Drug Carriers
Biological Transport
Penetration (firestop)
Hydrogen-Ion Concentration
Oxygen
Drug Liberation
chemistry
Polylysine
Biophysics
Nanoparticles
Tumor Hypoxia
Nanocarriers
Ethylene glycol
medicine.drug
Subjects
Details
- ISSN :
- 20474849
- Volume :
- 7
- Issue :
- 7
- Database :
- OpenAIRE
- Journal :
- Biomaterials science
- Accession number :
- edsair.doi.dedup.....80b8280e009296b8e02cc5420132194b