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Naked DNA prevents soman intoxication
Ai Ling Fu1, Yu Xia Wang, Man Ji Sun
1Institute of Pharmacology and Toxicology, Academy of Military Medical Sciences, Bejing 100850, PR China.
Biochemical and Biophysical Research Communications
|February 15, 2005
Summary
Increasing serum paraoxonase (PON1) levels via naked DNA injection in mice enhanced protection against soman toxicity. This method showed a dose-dependent effect, reducing mortality and extending survival times in treated animals.
Area of Science:
- Biochemistry
- Toxicology
- Gene Therapy
Background:
- Paraoxonase (Q isoenzyme, PON1) is crucial for hydrolyzing organophosphates like soman and chlorpyrifos-oxon (CPO).
- Previous research suggested adenoviral gene therapy could elevate serum PON1 to mitigate CPO toxicity.
Purpose of the Study:
- To investigate the efficacy of naked DNA (plasmid pcDNA/PON1) delivery for increasing serum PON1 levels in mice.
- To evaluate the protective effects of elevated PON1 against acute soman toxicity.
Main Methods:
- Mice received tail vein injections of varying doses of plasmid pcDNA/PON1.
- PON1 activity was measured post-injection to assess expression levels and duration.
- A toxicity study exposed pre-treated mice to a lethal dose of soman.
Main Results:
- Plasmid pcDNA/PON1 demonstrated excellent expression within 24 hours, with activity decreasing over time.
- A clear dose-effect relationship was observed between plasmid dosage and PON1 activity.
- Mice pre-treated with pcDNA/PON1 showed extended mean death latency and reduced mortality compared to controls.
Conclusions:
- Naked DNA delivery of PON1 is an effective method for increasing serum PON1 levels in vivo.
- Elevated serum PON1 confers significant protection against the acute toxicity of soman.
- This approach holds potential for developing novel countermeasures against organophosphate poisoning.