title: Au@SiO2 core-shell structure involved with methotrexate: Fabrication, biodegradation process and bioassay explore.
abstract: A new strategy is proposed to synthesize a kind of Au@SiO2 core-shell structure with methotrexate (MTX) loaded within it. Firstly, MTX molecules are attracted to the surface and vicinity of Au nanoparticles (NPs). Then the enriched MTX molecules on the surface of Au NPs have a good chance to be wrapped into the core-shell structure when SiO2 is uniformly deposited on the Au core. Secondly, the effect of Au amount and MTX content on the drug-loading capacity is emphatically studied and the result shows that core-shell structure plays a vital role in drug loading. In addition, the biodegradation process is also examined in phosphate buffer solution (PBS) at 37°C. The results show that the biodegradation of Au-MTX@SiO2 core-shell structure can be divided into two stages: the release of drug together with the fragmentation of core-shell structure and the subsequent dissolution of SiO2 layers. Lastly, in vitro bioassay tests give the evidence that obvious tumor inhibition can be achieved in presence of Au-MTX@SiO2 NPs even at low concentration and the efficacy can be greatly enhanced by the photothermal therapy on Au cores.
authors.affiliation: Jiangsu Key Laboratory of Biofunctional Material, College of Chemistry and Material Science, Nanjing Normal University, Nanjing 210023, China.
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Huo
authors.affiliation: Jiangsu Key Laboratory of Biofunctional Material, College of Chemistry and Material Science, Nanjing Normal University, Nanjing 210023, China.
authors.forename: Chaofan
authors.initials: C
authors.lastname: Dai
authors.affiliation: Jiangsu Key Laboratory of Biofunctional Material, College of Chemistry and Material Science, Nanjing Normal University, Nanjing 210023, China.
authors.forename: Deying
authors.initials: D
authors.lastname: Tian
authors.affiliation: Jiangsu Key Laboratory of Biofunctional Material, College of Chemistry and Material Science, Nanjing Normal University, Nanjing 210023, China; Jiangsu Provincial Key Laboratory of Palygorskite Science and Applied Technology, Huaiyin Institute of Technology, Huaian 223003, China. Electronic address: lishuping@njnu.edu.cn.
authors.forename: Shuping
authors.initials: S
authors.lastname: Li
authors.affiliation: Jiangsu Key Laboratory of Biofunctional Material, College of Chemistry and Material Science, Nanjing Normal University, Nanjing 210023, China. Electronic address: lixiaodong1@njnu.edu.cn.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Li
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology; D001681:Biological Assay; D002470:Cell Survival / Q000187:drug effects; D016503:Drug Delivery Systems; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry; D008727:Methotrexate / Q000737:chemistry* / Q000494:pharmacology; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D000970:Antineoplastic Agents; D006046:Gold; D012822:Silicon Dioxide; D008727:Methotrexate
keywords: Au; Core–shell structure; Drug delivery; Methotrexate; SiO(2)