alexa Trafficking of intracerebroventricularly injected antisense oligonucleotides in the mouse brain.
Materials Science

Materials Science

Journal of Nanomedicine & Biotherapeutic Discovery

Author(s): Chauhan NB

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Abstract Intracerebroventricular (icv) delivery of therapeutic molecules directly into the brain parenchyma has attracted considerable attention because of the advantage of bypassing the blood-brain barrier. Exogenous icv administration of antisense oligodeoxynucleotides (AS-ODNs) has been implicated in modifying gene expression within the targeted brain area. The biodistribution, tissue penetration, and stability of exogenously administered AS-ODNs are the major determinants with regard to their potential utility as agents for modifying gene expression. This report examined the distribution and clearance of labeled AS-ODNs with the aim of exploring the feasibility of icv administration of AS-ODNs as a targeted treatment approach to Alzheimer's disease. A single icv injection of fluorescein-labeled 2'-O-(methoxy) ethyl (2'MOE) ribosyl-modified AS-ODNs directed at the beta-secretase cleavage site of beta-amyloid precursor protein (APP) mRNA into the mouse brain showed rapid uptake by 15 minutes, overall gradual spread and retention by 30 minutes to 3 hours, and complete clearance by 8 hours postinjection. Labeled AS-ODNs were observed to penetrate across the cell membrane and accumulate in both nuclear and cytoplasmic compartments of neuronal and nonneuronal cell populations. Current study provides a basic pattern of uptake, distribution, and stability of AS-ODNs in the mouse brain. This article was published in Antisense Nucleic Acid Drug Dev and referenced in Journal of Nanomedicine & Biotherapeutic Discovery

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