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Production of adeno-associated virus vectors for in vitro and in vivo applications.

Abstract：

:Delivering and expressing a gene of interest in cells or living animals has become a pivotal technique in biomedical research and gene therapy. Among viral delivery systems, adeno-associated viruses (AAVs) are relatively safe and demonstrate high gene transfer efficiency, low immunogenicity, stable long-term expression, and selective tissue tropism. Combined with modern gene technologies, such as cell-specific promoters, the Cre/lox system, and genome editing, AAVs represent a practical, rapid, and economical alternative to conditional knockout and transgenic mouse models. However, major obstacles remain for widespread AAV utilization, such as impractical purification strategies and low viral quantities. Here, we report an improved protocol to produce serotype-independent purified AAVs economically. Using a helper-free AAV system, we purified AAVs from HEK293T cell lysates and medium by polyethylene glycol precipitation with subsequent aqueous two-phase partitioning. Furthermore, we then implemented an iodixanol gradient purification, which resulted in preparations with purities adequate for in vivo use. Of note, we achieved titers of 1010-1011 viral genome copies per µl with a typical production volume of up to 1 ml while requiring five times less than the usual number of HEK293T cells used in standard protocols. For proof of concept, we verified in vivo transduction via Western blot, qPCR, luminescence, and immunohistochemistry. AAVs coding for glutaredoxin-1 (Glrx) shRNA successfully inhibited Glrx expression by ~66% in the liver and skeletal muscle. Our study provides an improved protocol for a more economical and efficient purified AAV preparation.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Kimura T,Ferran B,Tsukahara Y,Shang Q,Desai S,Fedoce A,Pimentel DR,Luptak I,Adachi T,Ido Y,Matsui R,Bachschmid MM

doi

10.1038/s41598-019-49624-w

subject

Has Abstract

pub_date

2019-09-19 00:00:00

pages

13601

issue

1

issn

2045-2322

pii

10.1038/s41598-019-49624-w

journal_volume

9

pub_type

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