title: A mesoporous silica nanosphere-based carrier system with chemically removable CdS nanoparticle caps for stimuli-responsive controlled release of neurotransmitters and drug molecules.
abstract: An MCM-41 type mesoporous silica nanosphere-based (MSN) controlled-release delivery system has been synthesized and characterized using surface-derivatized cadmium sulfide (CdS) nanocrystals as chemically removable caps to encapsulate several pharmaceutical drug molecules and neurotransmitters inside the organically functionalized MSN mesoporous framework. We studied the stimuli-responsive release profiles of vancomycin- and adenosine triphosphate (ATP)-loaded MSN delivery systems by using disulfide bond-reducing molecules, such as dithiothreitol (DTT) and mercaptoethanol (ME), as release triggers. The biocompatibility and delivery efficiency of the MSN system with neuroglial cells (astrocytes) in vitro were demonstrated. In contrast to many current delivery systems, the molecules of interest were encapsulated inside the porous framework of the MSN not by adsorption or sol-gel types of entrapment but by capping the openings of the mesoporous channels with size-defined CdS nanoparticles to physically block the drugs/neurotransmitters of certain sizes from leaching out. We envision that this new MSN system could play a significant role in developing new generations of site-selective, controlled-release delivery nanodevices.
authors.affiliation: Department of Chemistry, Iowa State University, Ames, IA 50011-3111, USA.
authors.forename: Cheng-Yu
authors.initials: CY
authors.lastname: Lai
authors.forename: Brian G
authors.initials: BG
authors.lastname: Trewyn
authors.forename: Dusan M
authors.initials: DM
authors.lastname: Jeftinija
authors.forename: Ksenija
authors.initials: K
authors.lastname: Jeftinija
authors.forename: Shu
authors.initials: S
authors.lastname: Xu
authors.forename: Srdija
authors.initials: S
authors.lastname: Jeftinija
authors.forename: Victor S-Y
authors.initials: VS
authors.lastname: Lin
mesh_terms: D000255:Adenosine Triphosphate / Q000008:administration & dosage* / Q000737:chemistry; D000818:Animals; D001253:Astrocytes / Q000187:drug effects / Q000378:metabolism; D001672:Biocompatible Materials / Q000008:administration & dosage / Q000737:chemistry; D019187:Cadmium Compounds / Q000008:administration & dosage / Q000737:chemistry*; D002478:Cells, Cultured; D003692:Delayed-Action Preparations; D004229:Dithiothreitol / Q000008:administration & dosage / Q000737:chemistry; D004337:Drug Carriers; D008623:Mercaptoethanol / Q000008:administration & dosage / Q000737:chemistry; D018377:Neurotransmitter Agents / Q000008:administration & dosage* / Q000737:chemistry; D010316:Particle Size; D051381:Rats; D012822:Silicon Dioxide / Q000008:administration & dosage / Q000138:chemical synthesis / Q000737:chemistry*; D013440:Sulfides / Q000008:administration & dosage / Q000737:chemistry*; D014640:Vancomycin / Q000008:administration & dosage* / Q000737:chemistry
chemical_list: D001672:Biocompatible Materials; D019187:Cadmium Compounds; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D018377:Neurotransmitter Agents; D013440:Sulfides; C034939:cadmium sulfide; D008623:Mercaptoethanol; D014640:Vancomycin; D012822:Silicon Dioxide; D000255:Adenosine Triphosphate; D004229:Dithiothreitol