Journal
MOLECULAR IMAGING AND BIOLOGY
Volume 9, Issue 5, Pages 267-277Publisher
SPRINGER
DOI: 10.1007/s11307-007-0101-8
Keywords
Gaussia luciferase; bioluminescence; carcinoembryonic antigen; engineered antibodies; nude mouse xenograft models
Funding
- NCI NIH HHS [R24 CA92865, R01 CA082214, P30 CA16042, P01 CA43904] Funding Source: Medline
- NIGMS NIH HHS [T32 GM08652] Funding Source: Medline
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The bioluminescent protein Gaussia luciferase (GLuc) was fused to an anti-carcinoembryonic antigen (CEA) antibody fragment, the diabody, for in vivo optical tumor imaging. A 15-amino acid N-terminal truncation (GL Delta 15) resulted in a brighter protein. Fusions of the anti-CEA diabody to full-length GLuc and GL Delta 15 retained high affinity for the antigen, emitted light, and exhibited excellent enzymatic stability. In vivo optical imaging of tumor-bearing mice demonstrated specific targeting of diabody-GL Delta 15 to CEA-positive xenografts, with a tumor/background ratio of 3.8 +/- 0.4 at four hours after tail-vein injection, compared to antigen-negative tumors at 1.3 +/- 0.1 (p=0.001). MicroPET imaging using I-124-diabody-GL Delta 15 demonstrated specific uptake in the CEA-positive tumor (2.6% ID [injected dose]/g) compared to the CEA-negative tumor (0.4% ID/g) at 21 hours. Although further optimization of this fusion protein may be needed to improve in vivo performance, the diabody-GL Delta 15 is a promising optical imaging probe for tumor detection in vivo.
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