Cited by 72Virus-based gene therapy researchCancer Research and TreatmentsTelomeres, Telomerase, and Senescence

Visualization of Intrathoracically Disseminated Solid Tumors in Mice with Optical Imaging by Telomerase-Specific Amplification of a Transferred Green Fluorescent Protein Gene

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Umeoka, Tatsuo, Kawashima, Takeshi, Kagawa, Shunsuke, Teraishi, Fuminori, Taki, Masaki, Nishizaki, Masahiko, Kyo, Satoru, Nagai, Katsuyuki +3 more·2004·Cancer Research

Abstract

Currently available methods for detection of tumors in vivo such as X-ray, computed tomography, and ultrasonography are noninvasive and have been well studied; the images, however, are not specific for tumors. Direct optical imaging of tumor cells in vivo that can clearly distinguish them from surrounding normal tissues may be clinically useful. Here, we describe a new approach to visualizing tumors whose fluorescence can be detected using tumor-specific replication-competent adenovirus (OBP-301, Telomelysin) in combination with Ad-GFP, a replication-deficient adenovirus expressing green fluorescent protein (GFP). Human telomerase reverse transcriptase is the catalytic subunit of telomerase, which is highly active in cancer cells but quiescent in most normal somatic cells. We constructed an adenovirus 5 vector in which the human telomerase reverse transcriptase promoter element drives expression of E1A and E1B genes linked with an internal ribosome entry site and showed that OBP-301 replicated efficiently in human cancer cells, but not in normal cells such as human fibroblasts. When the human lung and colon cancer cell lines were infected with Ad-GFP at a low multiplicity of infection, GFP expression could not be detected under a fluorescence microscope; in the presence of OBP-301, however, Ad-GFP replicated in these tumor cells and showed strong green signals. In contrast, coinfection with OBP-301 and Ad-GFP did not show any signals in normal cells such as fibroblasts and vascular endothelial cells. We also found that established subcutaneous tumors could be visualized after intratumoral injection of OBP-301 and Ad-GFP. A549 human lung tumors and SW620 human colon tumors transplanted into BALB/c nu/nu mice were intratumorally injected with 8 × 105 plaque-forming units of Ad-GFP in combination with 8 × 106 plaque-forming units of OBP-301. Within 3 days of treatment, the fluorescence of the expressed GFP became visible by a three-chip color cooled charged-coupled device camera in these tumors, whereas intratumoral injection of Ad-GFP alone could not induce GFP fluorescence. Moreover, intrathoracic administration of Ad-GFP and OBP-301 could visualize disseminated A549 tumor nodules in mice after intrathoracic implantation. Our results indicate that intratumoral or intrathoracic injection of Ad-GFP in combination with OBP-301 might be a useful diagnostic method that provides a foundation for future clinical application.

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Authors
Umeoka, T., Kawashima, T., Kagawa, S., Teraishi, F., Taki, M., Nishizaki, M., Kyo, S., Nagai, K., Urata, Y., Tanaka, N., & Fujiwara, T.
Affiliations
  • Okayama University (JP)
  • Kanazawa University (JP)
  • Oncolys BioPharma (Japan) (JP)
Venue
Cancer Research
Published
2004-09-01
Volume
64
Issue
17
Pages
6259-6265
ISSN
  • 0008-5472 (ISSN-L)
  • 1538-7445
OpenAlex
W2160107647
Cited by
72
References
23
Citations by year
2024: 1 · 2023: 4 · 2022: 1 · 2019: 1 · 2016: 3 · 2015: 4 · 2014: 2 · 2013: 4 · 2012: 6
FWCI
3.04
Type
journal article
Language
en
Locations
  • Cancer Research (publishedVersion)
  • PubMed (publishedVersion)
  • Institutional Repositories DataBase (IRDB) (submittedVersion)
  • Okayama University Scientific Achievement Repository (Okayama University) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Virus-based gene therapy research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biotechnology › Cancer Research and Treatments
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
Keywords
tumor imaging, human telomerase reverse transcriptase, adenoviral vector, OBP-301, green fluorescent protein, lung cancer, colon cancer, tumor-specific gene expression, tumor nodules, fluorescence imaging, nude mice, A549 cells, SW620
MeSH terms
Adenoviridae, Animals, Carcinoma, Non-Small-Cell Lung, DNA-Binding Proteins, Female, Gene Amplification, Humans, Luminescent Proteins, Lung Neoplasms, Mice, Inbred BALB C, Mice, Nude, Microscopy, Fluorescence, Neoplasm Transplantation, Transplantation, Heterologous, Gene Transfer Techniques, Transgenes, Telomerase, Green Fluorescent Proteins, Mice

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