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Replacing 99mTc with 111In improves MORF/cMORF pretargeting by reducing intestinal accumulation
Guozheng Liu1, Dengfeng Cheng, Shuping Dou
1Division of Nuclear Medicine, Department of Radiology, University of Massachusetts Medical School, 55 Lake Ave North, Worcester, MA 01655-0243, USA. guozheng.liu@umassmed.edu
Molecular Imaging and Biology
|March 28, 2009
Summary
For abdominal imaging using MORF/cMORF pretargeting, indium-111 (111In) demonstrated superior performance over technetium-99m (99mTc) due to significantly less intestinal accumulation. This suggests 111In is a better radiolabel for deep abdominal organ imaging.
Area of Science:
- Nuclear Medicine
- Radiopharmaceutical Development
- Pretargeted Imaging
Background:
- MORF/cMORF pretargeting is a novel imaging strategy.
- Reducing radiotracer accumulation in abdominal organs is crucial for clear imaging.
Purpose of the Study:
- To compare the efficacy of technetium-99m (99mTc) and indium-111 (111In) as radiolabels for MORF/cMORF pretargeting.
- To evaluate the impact of radiolabel choice on abdominal accumulation.
Main Methods:
- Normal and tumored mice were administered either 99mTc- or 111In-labeled cMORF.
- Pharmacokinetics and biodistribution were assessed through imaging and ex vivo analysis.
- Pretargeted imaging was performed in tumored mice using MORF-antibody followed by radiolabeled cMORF.
Main Results:
- Both 99mTc-cMORF and 111In-cMORF showed rapid renal excretion.
- Significant intestinal accumulation of 99mTc-cMORF (approximately 2%) was observed, whereas 111In-cMORF showed negligible intestinal accumulation.
- Tumor accumulation of the radiotracer remained consistent regardless of the radiolabel.
Conclusions:
- Indium-111 (111In) is a potentially superior radiolabel compared to technetium-99m (99mTc) for MORF/cMORF pretargeting.
- 111In labeling is advantageous for imaging abdominal organs like the pancreas due to reduced non-specific intestinal uptake.
