Imaging and tissue biodistribution of 99mTc-labeled adenovirus knob (serotype 5).

Abstract:

:Hepatic sequestration of systemically administered adenoviral vectors reduces the number of viral particles available for delivery to other tissues. The biological basis of this phenomenon was investigated using a new in vivo technique which permitted imaging in real time. Recombinant adenovirus serotype 5 knob (Ad5K) was radiolabeled with the gamma-emitter 99mTc (half-life = 6 h). Scatchard analysis of the 99mTc-Ad5K showed specific, high-affinity binding to U293 cells (Kd = 1.4 +/- 0.5 nM), demonstrating that the radiolabeling process had no effect on receptor binding. In vivo dynamic imaging with an Anger gamma camera revealed that the liver binding followed an exponential rise to maximum, with a measured 100% extraction efficiency. Initially, the liver binding capacity was 3.1 +/- 0.4 micrograms Ad5K, equivalent to approximately 17,000 Ad5K molecules per liver cell. Liver binding was blocked by preincubation of Ad5K with neutralizing anti-Ad5K antibody; a 50% reduction in liver uptake was demonstrated by imaging. Unlabeled Ad5K was more effective in blocking liver uptake of 99mTc-Ad5K, whereas irrelevant unlabeled Ad3K had no effect. Imaging data for the liver uptake studies were in agreement with biodistribution determined by removing and measuring tissues. These data demonstrated that in vivo imaging is a sensitive tool for measuring changes to liver tropism. Similar imaging techniques can be applied to adenovirus vectors to measure specific targeting for gene therapy.

journal_name

Gene Ther

journal_title

Gene therapy

authors

Zinn KR,Douglas JT,Smyth CA,Liu HG,Wu Q,Krasnykh VN,Mountz JD,Curiel DT,Mountz JM

doi

10.1038/sj.gt.3300659

subject

Has Abstract

pub_date

1998-06-01 00:00:00

pages

798-808

issue

6

eissn

0969-7128

issn

1476-5462

journal_volume

5

pub_type

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