Non-invasive gamma camera imaging of gene transfer using an adenoviral vector encoding an epitope-tagged receptor as a reporter

B. E. Rogers, T. R. Chaudhuri, P. N. Reynolds, D. Della Manna, K. R. Zinn

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


A model epitope-tagged receptor was constructed by fusing the hemagglutinin (HA) sequence on the extracellular N-terminus of the human somatostatin receptor subtype 2 (hSSTr2) gene. This construct was placed in an adenoviral (Ad-HAhSSTr2) vector. This study evaluated Ad-HAhSSTr2 in vitro and in vivo using FACS, fluorescent microscopy, radioactive binding assays, and gamma camera imaging techniques. Infection of A-427 non-small cell lung cancer cells with Ad-HAhSSTr2 or Ad-hSSTr2 resulted in similar expression of hSSTr2 by FACS analysis and binding assays using a 99mTc-labeled somatostatin analogue (99mTc-P2045 . HAhSSTr2 expression in A-427 cells was specific for infection with Ad-HAhSSTr2. FITC-labeled anti-HA antibody (FITC-HA) confirmed surface expression in live A-427 cells and the absence of internalization. Gamma camera imaging and gamma counter analysis of normal mice showed significantly greater (P<0.05) liver uptake of 99mTc-labeled anti-HA antibody (99mTc-anti-HA) in mice injected i.v. 48 h earlier with Ad-HAhSSTr2 (53.6 ± 6.9% ID/g) as compared to mice similarly injected with Ad-hSSTr2 (9.0 ± 1.3% ID/g). in a mouse tumor model, imaging detected increased tumor localization of 99mTc-anti-HA due to direct intratumor injection Ad-HAhSSTr2. Gamma counter analysis confirmed significantly greater (P<0.05) uptake of 99mTc-anti-HA in tumors injected with Ad-HAhSSTr2 (12.5 ± 4.1% ID/g) as compared to Ad-hSSTr2-infected tumors (5.1 ± 1.5% ID/g). These studies demonstrate the feasibility of using an epitope-tagged reporter receptor for non-invasively imaging gene transfer.

Original languageEnglish
Pages (from-to)105-114
Number of pages10
JournalGene therapy
Issue number2
StatePublished - Jan 2003


  • Gene transfer
  • Hemagglutinin
  • Imaging
  • Somatostatin receptor
  • Tc


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