Abstract:
:Dendrimers, spherical or quasi-spherical synthetic polymers in the nano-size range, have found useful applications as prospective carriers in drug and gene delivery. The investigation of dendrimer uptake by cells has been previously achieved by the incorporation of a fluorescent dye to the dendrimer either by chemical conjugation or by physical interaction. Here we describe the synthesis of two intrinsically fluorescent lysine based cationic dendrimers which lack a fluorophore, but which has sufficient fluorescence intensity to be detected at low concentrations. The nomenclature used to describe our compounds results in, for example the 6th generation dendrimer being notated as Gly-Lys(63) (NH2)(64); Gly denotes that the compound has a glycine in the core coupled to 63 lysine branching units (Lys(63)) and that the surface has 64 free amino groups (NH2)(64). The use of these dendrimers in probing transport avoids the need for fluorescent tagging with its attendant problems. The uptake of Gly-Lys(63) (NH2)(64) into Caco-2 cells was followed using confocal microscopy. Being cationic, it first adsorbs to the cell surface, enters the cytoplasm and reaches the nucleus within 35-45 min. Estimates of the diffusion coefficient of the dendrimer within the cell cytoplasm leads to a value of 6.27 ( +/- 0.49) x 10(-11) cm(2) s(-1), which is up to 1000 times lower than the diffusion coefficient of the dendrimer in water. Intrinsically fluorescent dendrimers of different size and charge are useful probes of transport in cells.
journal_name
J Drug Targetjournal_title
Journal of drug targetingauthors
Al-Jamal KT,Ruenraroengsak P,Hartell N,Florence ATdoi
10.1080/10611860600834441subject
Has Abstractpub_date
2006-07-01 00:00:00pages
405-12issue
6eissn
1061-186Xissn
1029-2330pii
R60Q12H788841W02journal_volume
14pub_type
杂志文章abstract::This study was designed to exploit the ability of Peyer's patch M cells to recognize antigen-antibody complexes in the targeted delivery of a model antigen for the induction of mucosal immunity. Sensitized liposomes consisted of an entrapped model antigen, ovalbumin (OVA), and coated with unrelated antigen-antibody co...
journal_title:Journal of drug targeting
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journal_title:Journal of drug targeting
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abstract::Chemotherapy is still a major challenge for in vivo drug targeting to macrophages. Toxicity remains the major obstacle for the most potent drugs already known in the therapy of leishmaniasis. Thus, new drugs and new delivery systems are sought. By using different vesicular delivery modes e.g. liposomes, niosomes, micr...
journal_title:Journal of drug targeting
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abstract:OBJECTIVE:Histone deacetylases (HDACs) have been revealed to be involved in cerebrovascular diseases, while the role of HDAC9 in intracranial aneurysm (IA) remains seldom studied. We aim to explore the role of the HDAC9/microRNA-92a (miR-92a)/Bcl-2-like protein 11 (BCL2L11) axis in IA progression. METHODS:Expression o...
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journal_title:Journal of drug targeting
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journal_title:Journal of drug targeting
pub_type: 杂志文章,评审
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journal_title:Journal of drug targeting
pub_type: 杂志文章
doi:10.1080/1061186X.2017.1400553
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journal_title:Journal of drug targeting
pub_type: 杂志文章
doi:10.1080/10611860600648494
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journal_title:Journal of drug targeting
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journal_title:Journal of drug targeting
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journal_title:Journal of drug targeting
pub_type: 杂志文章
doi:10.1080/1061186X.2020.1744157
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abstract::Poly(D,L-lactic-co-glycolic) acid (PLGA) microspheres containing plasmid DNA encoding the firefly luciferase gene were prepared using the water-in-oil-in-water (w/o/w) double emulsion and solvent evaporation method. In this study, we investigated the effects of three process parameters on DNA microencapsulation: (1) e...
journal_title:Journal of drug targeting
pub_type: 杂志文章
doi:10.3109/10611869909085514
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journal_title:Journal of drug targeting
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doi:10.3109/1061186X.2013.851684
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journal_title:Journal of drug targeting
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journal_title:Journal of drug targeting
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journal_title:Journal of drug targeting
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journal_title:Journal of drug targeting
pub_type: 杂志文章,评审
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abstract::beta-Glucuronidase (GUSB) is a lysosomal enzyme that could be developed as a brain therapy for Type VII Mucopolysaccharidosis. However, GUSB does not cross the blood-brain barrier (BBB). To enable BBB transport of the enzyme, human GUSB was re-engineered as a fusion protein with the chimeric monoclonal antibody (MAb) ...
journal_title:Journal of drug targeting
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doi:10.3109/10611860903353362
更新日期:2010-04-01 00:00:00
abstract::A targeted delivery system for inflammatory bowel diseases, chitosan-Ca-alginate microparticles efficiently loaded with budesonide (BDS), were designed using one-step spray-drying process. They were eudragit-coated and examined for in vivo efficacy. Experimental colitis was induced by rectal instillation of 2,4,6-trin...
journal_title:Journal of drug targeting
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doi:10.3109/10611860903161310
更新日期:2009-12-01 00:00:00
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journal_title:Journal of drug targeting
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doi:10.3109/1061186X.2014.950665
更新日期:2015-01-01 00:00:00
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journal_title:Journal of drug targeting
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abstract::A promising strategy to carry genetic material to brain cells either in vitro or in vivo is using the LDL receptor (LDLr) on blood-brain barrier. LDLr naturally help to low density lipoproteins (LDL(S)) transporting across the BBB by endocytosis. Here we present the idea of using the LDLr-mediated pathway for transpor...
journal_title:Journal of drug targeting
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更新日期:2007-04-01 00:00:00
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journal_title:Journal of drug targeting
pub_type: 杂志文章,评审
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abstract::Microparticles-adsorbed insulin and zinc insulin (PenfilN) were molded to self-dissolving micropiles (SDMPs) with chondroitin sulfate as the base for the percutaneous administration of insulin. Porous silicon dioxide (Sylysia 320, 440 and 730) and porous calcium silicate (FloriteRE) were used as microparticles. As a r...
journal_title:Journal of drug targeting
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doi:10.1080/10611860701349794
更新日期:2007-06-01 00:00:00
abstract::Toxoplasmic encephalitis (TE) is the most common clinical manifestation of reactivated infection with Toxoplasma gondii in immunocompromised patients that is lethal if untreated. The combination of pyrimethamine plus sulfadiazine or clindamycin is the standard therapy for the treatment of TE, but these combinations ar...
journal_title:Journal of drug targeting
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