Figure 2 In vivo gene expression of a β-galactosidase reporter gene following systemic administration of THLs. (Top panels) β-galactoside histochemistry was performed on mouse brain and spleen
removed 2 days after an IV injection of THLs carrying … It is possible to produce THLs that carry plasmid DNA engineered with a tissue-specific promoter [20]. This is of particular relevance in gene therapy protocols Inhibitors,research,lifescience,medical wherein ectopic expression of the transgene is not desired When the lacZ expression plasmid is NLG919 driven by the brain-specific promoter derived from the 5′-flanking sequence of the glial fibrillary acid protein (Gfap) gene, the expression of β-galactosidase in brain was widely detected (Figure 2, top right panel), as previously seen with the SV40-lacZ plasmid (Figure 2, top left panel). On the contrary, there was no expression of the transgene in peripheral tissues (Figure 2, bottom right panel) when the transgene was under the influence of the brain-specific Gfap promoter. Tissue-specific Inhibitors,research,lifescience,medical gene expression with the combined use of THLs and the opsin promoter was demonstrated in vivo in the Rhesus monkey [35]. 4. In Vivo Efficacy of THLs in a Model of Inhibitors,research,lifescience,medical Mucopolysaccharidosis The in vivo efficacy of THLs was investigated in a model of type VII mucopolysaccharidosis (MPS), which is caused by mutations in the gene encoding the lysosomal enzyme β-glucuronidase
(GUSB) [36]. MPS is a lysosomal storage disorder, and the majority of lysosomal storage disorders adversely affect the central nervous system [37]. Therefore, therapeutic transgenes must be delivered to all parts of the brain, and this is only possible with a transvascular route to brain. THLs were prepared with a plasmid Inhibitors,research,lifescience,medical DNA encoding for GUSB, and with the TfRMab to target THLs across both the BBB and the BCM in a transgenic mouse model of MPS-VII. The GUSB expression plasmid, Inhibitors,research,lifescience,medical designated pCMV-GUSB, is driven by the widely read cytomegalovirus (CMV) promoter.
The latter was preferred over a brain-specific promoter, as MPS-VII affects both the CNS and peripheral tissues. The GUSB enzyme activity was investigated Levetiracetam in cultured fibroblasts obtained from GUSB null mice [GUSB(−)], and >50-fold increase in the GUSB activity was observed following incubation with the THL carrying the pCMV-GUSB as compared with control GUSB(−) fibroblasts (Figure 3(a)). The GUSB enzyme activity persisted at high levels for over 2-week period [36]. Figure 3 Enzyme replacement therapy with THLs in a mouse model of type VII mucopolysaccharidosis. (a) GUSB enzyme activity in GUSB null (−) fibroblasts and in fibroblasts obtained from wild type (+) mice. Fibroblasts were treated either with saline or … In vivo studies in GUSB null mice were also performed with a single dose of 10ug/mouse of pCMV-GUSB encapsulated in TfRMAb-targeted THLs.
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