title: pH-sensitive strontium carbonate nanoparticles as new anticancer vehicles for controlled etoposide release.
abstract: Strontium carbonate nanoparticles (SCNs), a novel biodegradable nanosystem for the pH-sensitive release of anticancer drugs, were developed via a facile mixed solvent method aimed at creating smart drug delivery in acidic conditions, particularly in tumor environments. Structural characterization of SCNs revealed that the engineered nanocarriers were uniform in size and presented a dumbbell-shaped morphology with a dense mass of a scale-like spine coating, which could serve as the storage structure for hydrophobic drugs. Chosen as a model anticancer agent, etoposide was effectively loaded into SCNs based on a simultaneous process that allowed for the formation of the nanocarriers and for drug storage to be accomplished in a single step. The etoposide-loaded SCNs (ESCNs) possess both a high loading capacity and efficient encapsulation. It was found that the cumulative release of etoposide from ESCNs is acid-dependent, and that the release rate is slow at a pH of 7.4; this rate increases significantly at low pH levels (5.8, 3.0). Meanwhile, it was also found that the blank SCNs were almost nontoxic to normal cells, and ESCN systems were evidently more potent in antitumor activity compared with free etoposide, as confirmed by a cytotoxicity test using an MTT assay and an apoptosis test with fluorescence-activated cell sorter (FACS) analysis. These findings suggest that SCNs hold tremendous promise in the areas of controlled drug delivery and targeted cancer therapy.
authors.affiliation: Shanghai Tenth People's Hospital, School of Life Science and Technology, Tongji University, Shanghai, PR China.
authors.forename: Wen-Yu
authors.initials: WY
authors.lastname: Qian
authors.forename: Dong-Mei
authors.initials: DM
authors.lastname: Sun
authors.forename: Rong-Rong
authors.initials: RR
authors.lastname: Zhu
authors.forename: Xi-Ling
authors.initials: XL
authors.lastname: Du
authors.forename: Hui
authors.initials: H
authors.lastname: Liu
authors.forename: Shi-Long
authors.initials: SL
authors.lastname: Wang
mesh_terms: D000970:Antineoplastic Agents / Q000008:administration & dosage / Q000737:chemistry; D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage / Q000737:chemistry; D017209:Apoptosis / Q000187:drug effects; D002254:Carbonates / Q000737:chemistry*; D003692:Delayed-Action Preparations / Q000008:administration & dosage / Q000138:chemical synthesis*; D005047:Etoposide / Q000008:administration & dosage* / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D053769:Nanocapsules / Q000008:administration & dosage* / Q000737:chemistry* / Q000648:ultrastructure; D009374:Neoplasms, Experimental / Q000188:drug therapy* / Q000473:pathology; D010316:Particle Size; D013324:Strontium / Q000737:chemistry*; D016896:Treatment Outcome
chemical_list: D000970:Antineoplastic Agents; D000972:Antineoplastic Agents, Phytogenic; D002254:Carbonates; D003692:Delayed-Action Preparations; D053769:Nanocapsules; C054286:strontium carbonate; D005047:Etoposide; D013324:Strontium