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Regioselective Biolistic Targeting in Organotypic Brain Slices Using a Modified Gene Gun

Regioselective Biolistic Targeting in Organotypic Brain Slices Using a Modified Gene Gun

Published on: October 24, 2014

Noninvasive gene targeting to the brain.

N Shi¹, W M Pardridge

¹Department of Medicine, University of California School of Medicine, Los Angeles, CA 90095-1682, USA.

Proceedings of the National Academy of Sciences of the United States of America

|June 7, 2000

Summary

Noninvasive gene therapy for the brain is now possible. Researchers developed neutral immunoliposomes that target the transferrin receptor, enabling gene delivery across the blood-brain barrier (BBB) after intravenous administration.

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Targeted Knockdown of Genes in the Choroid Plexus

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Area of Science:

Neuroscience
Biotechnology
Gene Therapy

Background:

The blood-brain barrier (BBB) restricts the delivery of therapeutic agents, including gene formulations, to the brain.
Previous brain gene therapy methods required invasive procedures like craniotomy or disruptive intracarotid infusions.

Purpose of the Study:

To investigate the efficacy of noninvasive intravenous gene delivery to the brain using targeted immunoliposomes.
To evaluate the expression of exogenous genes in the brain following this novel delivery method.

Main Methods:

Development of neutral pegylated immunoliposomes conjugated with the OX26 mAb targeting the rat transferrin receptor.
Encapsulation of 6- to 7-kb expression plasmids encoding luciferase or beta-galactosidase within the immunoliposomes.
Noninvasive intravenous administration of the gene formulation to adult rats.

Main Results:

Successful expression of luciferase and beta-galactosidase genes in the brain after a single intravenous dose.
Gene expression peaked at 48 hours post-administration with a significantly lower DNA dose compared to cationic liposomes.
Histochemistry confirmed widespread gene expression throughout the central nervous system, including neurons and vasculature.

Conclusions:

Neutral immunoliposomes can effectively target the BBB's transferrin receptor for noninvasive gene delivery.
This method bypasses the need for viruses or cationic liposomes, offering a safer alternative for brain gene therapy.
Endogenous receptor-mediated transport pathways can be leveraged for widespread gene expression in the brain.