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Updated: May 26, 2026
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Multimodal Imaging of Stem Cell Implantation in the Central Nervous System of Mice
Published on: June 13, 2012
Multimodal image coregistration and inducible selective cell ablation to evaluate imaging ligands
John Virostko1, Joseph Henske, Laurent Vinet
1Vanderbilt University Institute of Imaging Science, Vanderbilt University, Nashville, TN 37232, USA.
Summary
Multimodal imaging successfully identified the pancreas, but PET radiotracers targeting vesicular monoamine transporter 2 did not detect beta-cell loss or bind human islets, highlighting imaging platform utility.
Area of Science:
- Nuclear medicine and molecular imaging
- Endocrinology and metabolic diseases
- Preclinical research models
Background:
- Developing targeted positron emission tomography (PET) radiotracers for pancreatic beta cells is crucial for diagnosing and monitoring diseases like diabetes.
- Vesicular monoamine transporter 2 (VMAT2) is a potential target for PET imaging of beta cells.
- Accurate validation of novel PET tracers requires robust imaging methodologies.
Purpose of the Study:
- To evaluate three novel PET radiotracers, [(18)F]FP-DTBZ, (18)F-AV-266, and (18)F-AV-300, for their ability to target and image pancreatic beta cells.
- To assess the efficacy of a multimodal imaging approach combining bioluminescence, PET, and X-ray computed tomography for accurate PET signal quantification in the pancreas.
- To validate the specificity of VMAT2-targeting PET ligands for human beta cells in vivo.
Main Methods:
- Combined bioluminescence imaging (BLI), PET, and X-ray computed tomography (CT) in preclinical models.
- Utilized tomographic reconstruction of bioluminescent sources to precisely delineate the pancreas.
- Coregistered BLI, PET, and CT images for accurate pancreatic PET signal quantification.
- Evaluated PET tracer signal after conditional beta-cell ablation and in mice transplanted with human islets.
Main Results:
- The multimodal imaging strategy enabled unambiguous identification and accurate quantification of the pancreatic PET signal.
- Bioluminescence imaging detected rapid beta-cell loss, but the PET signal from the three VMAT2-targeting radiotracers remained unchanged.
- PET ligands did not specifically bind to luciferase-expressing human islets transplanted into mice, despite successful BLI detection.
Conclusions:
- The evaluated VMAT2-directed PET radiotracers did not specifically bind to mouse or human beta cells in vivo.
- Coregistered multimodal imaging is a powerful platform for the evaluation and validation of candidate islet-targeting ligands.
- This study underscores the importance of rigorous validation for novel PET tracer development.
