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Efficient retrograde neuronal transduction utilizing self-complementary AAV1.

Edmund R Hollis1, Ken Kadoya, Matthew Hirsch

  • 1Department of Neurosciences, University of California, San Diego, La Jolla, California 92093, USA.

Molecular Therapy : the Journal of the American Society of Gene Therapy
|January 29, 2008
PubMed
Summary
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Self-complementary adeno-associated virus serotype 1 (scAAV1) shows superior retrograde transport in peripheral nerves. This enhances gene delivery efficiency to spinal cord motor neurons for potential therapies.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Gene Therapy

Background:

  • Adeno-associated virus (AAV) vectors are utilized for gene transfer to the central nervous system (CNS).
  • AAV exhibits retrograde transport via axons, enabling gene expression in neurons distant from the injection site.

Purpose of the Study:

  • To evaluate the retrograde transport capabilities of self-complementary AAV (scAAV) serotypes 1-6 after peripheral administration.
  • To identify optimal scAAV serotypes for efficient gene delivery to spinal cord motor neurons via retrograde transport.

Main Methods:

  • Peripheral injections of scAAV serotypes 1-6 into rat extensor carpi muscle or sciatic nerve.
  • Analysis of retrograde vector transport and reporter gene expression in spinal cord motor neurons (MNs).
  • Comparison of transduction efficiency between scAAV1, scAAV2, and single-stranded AAV1.

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Main Results:

  • scAAV1 demonstrated the highest retrograde transport efficiency, transducing 4.1% of cervical MNs (muscle injection) and 7.5% of lumbar MNs (nerve injection).
  • scAAV2 showed significantly lower transduction rates (undetectable after muscle injection, 0.81% after nerve injection).
  • Single-stranded AAV1 required tenfold higher viral doses than scAAV1 for detectable transgene expression, with lower efficiency (0.91% MN transduction).

Conclusions:

  • scAAV1 is the most effective serotype for retrograde gene transfer to spinal cord motor neurons following peripheral injection.
  • scAAV1 offers enhanced efficiency for therapeutic gene delivery to the CNS via retrograde axonal transport.
  • These findings support the use of scAAV1 for targeted gene therapies affecting the spinal cord.