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Transient activation of transgene expression by hydrodynamics-based injection may cause rapid decrease in plasmid DNA

H Ochiai¹, M Fujimuro, H Yokosawa

¹Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-ku, Sapporo, Japan.

|May 26, 2007

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Hydrodynamics-based injection enhances transgene expression, but silencing occurs without histone modification. A second injection, even saline, boosts expression, suggesting activation by manipulation, not histone changes.

Area of Science:

Molecular Biology
Gene Therapy
Biochemistry

Background:

Intranuclear DNA location is crucial for therapeutic efficacy.
Hydrodynamics-based injection (HBI) leads to rapid exogenous DNA expression decline (silencing) without CpG methylation.

Purpose of the Study:

Investigate histone modifications' role in HBI-mediated DNA silencing.
Examine the impact of repeat HBI on transgene expression.

Main Methods:

Delivered naked luciferase-plasmid DNA into mouse liver via HBI.
Analyzed histone modifications on plasmid DNA using chromatin immunoprecipitation (ChIP).
Assessed effects of a second HBI on luciferase expression.

Main Results:

Related Experiment Videos

Histone H3 modification status remained constant from 4 hours to 4 weeks post-injection.

A subsequent injection of saline alone enhanced luciferase expression from previously administered DNA.

These findings indicate histone modification is not involved in silencing.

Conclusions:

HBI manipulation, not histone modification, activates transgene expression.
The return from this activated state is responsible for silencing.
Repeat HBI can boost expression from existing DNA.