1. Evaluation of apoptosis imaging biomarkers in a genetic model of cell death
- Author
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Vessela Vassileva, Stephen M. Stribbling, Chris Barnes, Laurence Carroll, Marta Braga, Joel Abrahams, Kathrin Heinzmann, Caroline Haegeman, Marion MacFarlane, Kathryn L. Simpson, Caroline Dive, Jamie Honeychurch, Timothy M. Illidge, and Eric O. Aboagye
- Subjects
Apoptosis ,Caspases ,Molecular imaging ,18F-ICMT-11 ,PET ,Radiotracer ,Medical physics. Medical radiology. Nuclear medicine ,R895-920 - Abstract
Abstract Purpose We have previously developed the caspase-based radiotracer, 18F-ICMT-11, for PET imaging to monitor treatment response. We further validated 18F-ICMT-11 specificity in a murine melanoma death-switch tumour model with conditional activation of caspase-3 induced by doxycycline. Methods Caspase-3/7 activity and cellular uptake of 18F-ICMT-11, 18F-ML-10 and 18F-FDG were assessed in B16ova and B16ovaRevC3 cells after death-switch induction. Death-switch induction was confirmed in vivo in xenograft tumours, and 18F-ICMT-11 and 18F-ML-10 biodistribution was assessed by ex vivo gamma counting of select tissues. PET imaging was performed with 18F-ICMT-11, 18F-ML-10 and 18F-FDG. Caspase-3 activation was confirmed by immunohistochemistry. Results Significantly increased caspase-3/7 activity was observed only in B16ovaRevC3 cells after death-switch induction, accompanied by significantly increased 18F-ICMT-11 (p
- Published
- 2019
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