title: Real-time imaging of tunable adenosine 5-triphosphate release from an MCM-41-type mesoporous silica nanosphere-based delivery system.
abstract: We studied a mesoporous silica nanosphere (MSN) material with tunable release capability for drug delivery applications. We employed luciferase chemiluminescence imaging to investigate the kinetics and mechanism of the adenosine 5-triphosphate (ATP) release with various disulfide-reducing agents as uncapping triggers. ATP molecules were encapsulated within the MSNs by immersing dry nanospheres in aqueous solutions of ATP followed by capping of the mesopores with chemically removable caps, such as cadmium sulfide (CdS) nanoparticles and poly(amido amine) dendrimers (PAMAM), via a disulfide linkage. By varying the chemical nature of the ''cap'' and ''trigger'' molecules in our MSN system, we discovered that the release profiles could indeed be regulated in a controllable fashion.
authors.affiliation: Ames Laboratory-USDOE and Department of Chemistry, Iowa State University, Ames, Iowa 50011-3111, USA.
authors.forename: Jason A
authors.initials: JA
authors.lastname: Gruenhagen
authors.forename: Cheng-Yu
authors.initials: CY
authors.lastname: Lai
authors.forename: Daniela R
authors.initials: DR
authors.lastname: Radu
authors.forename: Victor S-Y
authors.initials: VS
authors.lastname: Lin
authors.forename: Edward S
authors.initials: ES
authors.lastname: Yeung
mesh_terms: D000255:Adenosine Triphosphate / Q000032:analysis* / Q000737:chemistry*; D003199:Computer Systems; D003692:Delayed-Action Preparations / Q000032:analysis* / Q000737:chemistry*; D004058:Diffusion; D004337:Drug Carriers / Q000032:analysis / Q000737:chemistry; D008163:Luminescent Measurements / Q000379:methods*; D008422:Materials Testing / Q000379:methods; D043942:Nanotubes / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D003692:Delayed-Action Preparations; D004337:Drug Carriers; D014867:Water; D012822:Silicon Dioxide; D000255:Adenosine Triphosphate