| Autor: |
Winegar, R. A., Monforte, J. A., Suing, K. D., O'loughlin, K. G., Rudd, C. J., MacGregor, J. T. |
| Zdroj: |
Human Gene Therapy; November 1996, Vol. 7 Issue: 17 p2185-2194, 10p |
| Abstrakt: |
ABSTRACTThe increasing use of nucleic acid-based therapeutics has created a need for new methods of determining tissue distribution and levels. Radiolabel methods may not always be appropriate because nucleic acids are easily degraded. Quantitation using the polymerase chain reaction (PCR) has the advantage that only continuous stretches of DNA will be amplified. In situhybridization allows detection of specific sequences in histological preparations. We have used quantitative PCR and in situhybridization techniques to study the pharmacokinetics and distribution of PGagPol (a potential anti-HTV plasmid vaccine) in rabbits. Samples were obtained 4 hr, 24 hr, 7 days, and 28 days after intramuscular injection of 100 μμg or 400 μμgof plasmid. A simplified procedure for collecting and processing tissues for PCR that minimizes the risk of contamination was developed. Using PCR, plasmid was found principally in the skin and muscle of the injection site and in blood plasma. At 4 hr after dosing with 400 μμg, the plasmid was detected at the injection site with mean copy numbers of 106(in muscle) and 4 ×× 104(in skin) per microgram of tissue. Plasmid copy number declined rapidly in muscle during the first 24 hr and was undetectable at 7 and 28 days after injection. The decline was slower in the skin, and the plasmid was still detectable at 28 days. With in situhybridization, plasmid was detected in muscle, mainly in the perimysium and to a lesser degree in the endomysium and within the muscle fibers. These data indicate that quantitative PCR and in situhybridization are sensitive methods for examining tissue distribution of DNA used for gene therapy. |
| Databáze: |
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