Positron emission tomography imaging of CD105 expression with 89Zr-Df-TRC105
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High tumor microvessel density correlates with a poor prognosis in multiple solid tumor types. The clinical gold standard for assessing microvessel density is CD105 immunohistochemistry on paraffin-embedded tumor specimens. The goal of this study was to develop an 89Zr-based PET tracer for noninvasive imaging of CD105 expression.
TRC105, a chimeric anti-CD105 monoclonal antibody, was conjugated to p-isothiocyanatobenzyl-desferrioxamine (Df-Bz-NCS) and labeled with 89Zr. FACS analysis and microscopy studies were performed to compare the CD105 binding affinity of TRC105 and Df-TRC105. PET imaging, biodistribution, blocking, and ex-vivo histology studies were performed on 4T1 murine breast tumor-bearing mice to evaluate the pharmacokinetics and tumor-targeting of 89Zr-Df-TRC105. Another chimeric antibody, cetuximab, was used as an isotype-matched control.
FACS analysis of HUVECs revealed no difference in CD105 binding affinity between TRC105 and Df-TRC105, which was further validated by fluorescence microscopy. 89Zr labeling was achieved with high yield and specific activity. Serial PET imaging revealed that the 4T1 tumor uptake of 89Zr-Df-TRC105 was 6.1 ± 1.2, 14.3 ± 1.2, 12.4 ± 1.5, 7.1 ± 0.9, and 5.2 ± 0.3 %ID/g at 5, 24, 48, 72, and 96 h after injection, respectively (n = 4), higher than all organs starting from 24 h after injection, which provided excellent tumor contrast. Biodistribution data as measured by gamma counting were consistent with the PET findings. Blocking experiments, control studies with 89Zr-Df-cetuximab, and ex-vivo histology all confirmed the in vivo target specificity of 89Zr-Df-TRC105.
We report here the first successful PET imaging of CD105 expression with 89Zr as the radiolabel. Rapid, persistent, CD105-specific uptake of 89Zr-Df-TRC105 in the 4T1 tumor was observed.
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- Positron emission tomography imaging of CD105 expression with 89Zr-Df-TRC105
European Journal of Nuclear Medicine and Molecular Imaging
Volume 39, Issue 1 , pp 138-148
- Cover Date
- Print ISSN
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- Positron emission tomography (PET)
- Tumor angiogenesis
- Industry Sectors
- Author Affiliations
- 1. Department of Radiology, University of Wisconsin - Madison, Madison, WI, USA
- 2. Department of Medical Physics, University of Wisconsin - Madison, Madison, WI, USA
- 3. Department of Medicine, University of Wisconsin - Madison, Madison, WI, USA
- 4. University of Wisconsin Carbone Cancer Center, Room 7137, 1111 Highland Ave, Madison, WI, 53705-2275, USA
- 5. TRACON Pharmaceuticals, Inc, San Diego, CA, USA