What question did this study set out to answer?

To determine how empty virion contamination impacts the transduction efficiency and side-effect profile of recombinant AAV8 gene delivery vectors.

January 1, 2014Molecular Therapy — Methods & Clinical DevelopmentOpen Access

Empty virions in AAV8 vector preparations reduce transduction efficiency and may cause total viral particle dose-limiting side effects

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Why the study?

Does the presence of empty virions in rAAV8 preparations reduce transduction efficiency and increase side effects in mice?

Population

C57BL/6 and BALB/c mice

Comparison

Intravenous injection of rAAV8 preparations with… vs Fully packaged rAAV8 lots without added empty…

Design

Preclinical

Follow-up

different time points

Authors

KGKai GaoKunming University of Science and Technology MLMengxin LiNortheast Forestry University ZLZhong‐Guang LiYunnan Normal University

Discussion

Member takes

Implication

Empty particles may reduce rAAV8 transduction and raise toxicity in mice; leaves open whether purification improves human gene therapy.

Key Points

To determine how empty virion contamination impacts the transduction efficiency and side-effect profile of recombinant AAV8 gene delivery vectors.
Generated fully packaged rAAV8 lots, partially and completely empty AAV8 virions, and mixtures with variable ratios carrying EGFP, nLacZ, or hA1AT reporter genes.
Administered vector formulations intravenously into C57BL/6 and BALB/c mice, assessing transgene expression levels and serum alanine aminotransferase (ALT) at designated time points.
Supplementing fixed rAAV8 doses with empty virions repressed liver transduction by up to 64% for secreted hA1AT and 44% for nLacZ in C57BL/6 mice.
BALB/c mice displayed inhibited EGFP expression alongside concurrent elevations in serum ALT, demonstrating that empty particles exacerbate vector-mediated hepatotoxicity.

Structured PICO

Does the presence of empty virions in rAAV8 preparations reduce transduction efficiency and increase side effects in mice?

Population

C57BL/6 and BALB/c mice

Intervention

Intravenous injection of rAAV8 preparations with variable ratios of empty virions (partially and completely empty AAV8 virions, fully packaged rAAV8 lots, and mixtures) expressing reporter genes (EGFP, nLacZ, or hA1AT)

Comparator

Fully packaged rAAV8 lots without added empty virions

Outcome

Transgene expression (EGFP, nLacZ, hA1AT) and serum alanine aminotransferase (ALT) levelssurrogate

The presence of empty virions in rAAV8 preparations reduces transduction efficiency and increases liver toxicity, suggesting that their removal may improve the efficacy and safety of AAV gene therapies.

Cite This Study

Gao et al. (2014) studied this question.

synapsesocial.com/papers/6a70e076e5469ee92be18ce7 https://doi.org/10.1038/mtm.2013.9

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Empty virions in AAV8 vector preparations reduce transduction efficiency and may cause total viral particle dose-limiting side effects

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Empty virions in AAV8 vector preparations reduce transduction efficiency and may cause total viral particle dose-limiting side effects

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Also Consider

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