title: The potential of self-assembled, pH-responsive nanoparticles of mPEGylated peptide dendron-doxorubicin conjugates for cancer therapy.
abstract: Nanoparticles, such as dendritic polymers, are currently investigated as excellent candidates for drug delivery vehicles. In this study, we report the preparation and characterization of mPEGylated peptide dendron-doxorubicin (dendron-DOX) conjugate based vehicle carrying 14.0 wt% (weight percent) of doxorubicin (DOX). Dynamic light scattering (DLS), scanning electron microscope (SEM) and transmission electron microscope (TEM) studies demonstrated the dendron-DOX conjugate self-assembled into nanoscale particles with neutral charged surface. The globular morphology and compact nanoparticle with diameter around 80 nm were observed by SEM and TEM. The release rates of DOX from the nanoparticle at pH 5.0 were much faster than those at pH 7.4 due to the pH-sensitive cleavage of the hydrazone bonds. The nanoparticle was shown to effectively kill cancer cells in vitro. Importantly, the nanoparticle resulted in strong antitumor activity and induced apoptosis on the 4T1 breast tumor model. In vivo toxicity evaluation demonstrated that drug-free dendron and drug-loading nanoparticle provided good biosafety in healthy or tumor-bearing mice, because no significant systematic toxicity was revealed via histological analysis. The functionalized peptide dendron-DOX conjugate based nanoparticle may be therefore a potential candidate for drug delivery vehicle for cancer therapy.
authors.affiliation: National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, China.
authors.forename: Wenchuan
authors.initials: W
authors.lastname: She
authors.forename: Kui
authors.initials: K
authors.lastname: Luo
authors.forename: Chengyuan
authors.initials: C
authors.lastname: Zhang
authors.forename: Gang
authors.initials: G
authors.lastname: Wang
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Geng
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Bin
authors.initials: B
authors.lastname: He
authors.forename: Zhongwei
authors.initials: Z
authors.lastname: Gu
mesh_terms: D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000008:administration & dosage / Q000737:chemistry; D003460:Crystallization / Q000379:methods; D003692:Delayed-Action Preparations / Q000008:administration & dosage* / Q000737:chemistry; D050091:Dendrimers / Q000737:chemistry; D004317:Doxorubicin / Q000008:administration & dosage* / Q000737:chemistry; D005240:Feasibility Studies; D005260:Female; D006863:Hydrogen-Ion Concentration; D051379:Mice; D008807:Mice, Inbred BALB C; D053769:Nanocapsules / Q000008:administration & dosage* / Q000737:chemistry*; D009374:Neoplasms, Experimental / Q000188:drug therapy* / Q000473:pathology; D010455:Peptides / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*; D016896:Treatment Outcome
chemical_list: D000903:Antibiotics, Antineoplastic; D003692:Delayed-Action Preparations; D050091:Dendrimers; D053769:Nanocapsules; D010455:Peptides; D011092:Polyethylene Glycols; D004317:Doxorubicin