Simultaneous evaluation of dual gene transfer to adherent cells by gamma-ray imaging

A gamma camera imaging method was developed to detect dual gene transfer to adherent cells growing as monolayers in cell culture plates. Human cancer cells were infected with replication-incompetent adenoviral vectors encoding the human type 2 somatostatin receptor (Ad-hSSTr2) and/or herpes virus thymidine kinase (Ad-TK). The hSSTr2 and TK reporter proteins were detected by imaging internally bound ^99mTc-P2045 peptide (Diatide, Inc.) and radioiodinated 2′-deoxy-2′-fluoro-β-D-arabinofuranosyl-5-iodouracil (FIAU), respectively. Following gene transfer, expression of hSSTr2 and TK were accurately imaged in vitro.