Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 106, Issue 37, Pages 15599-15603Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0908594106
Keywords
Cypridina luciferase; far-red luminescent probe; luciferin; tumor
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology, Japan [19710196, 20249060, 19614002]
- Grants-in-Aid for Scientific Research [19710196, 19614002, 20249060] Funding Source: KAKEN
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We aimed to develop a far-red luminescence imaging technology for visualization of disease specific antigens on cell surfaces in a living body. First, we conjugated a far-red fluorescent indocyanine derivative to biotinylated Cypridina luciferase. This conjugate produced a bimodal spectrum that has long-wavelength bioluminescence emission in the far-red region as a result of bioluminescence resonance energy transfer. To generate a far-red luminescent probe with targeting and imaging capabilities of tumors, we then linked this conjugate to an anti-human Dlk-1 monoclonal antibody via the biotin-avidin interaction. This far-red luminescent probe enabled us to obtain high-resolution microscopic images of live, Dlk-1-expressing Huh-7 cells without an external light source, and to monitor the accumulation of this probe in tumor-bearing mice. Thus this far-red luminescent probe is a convenient analytical tool for the evaluations of monoclonal antibody localization in a living body.
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