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Journal of Biomedical Optics • Open Access

Tomography of epidermal growth factor receptor binding to fluorescent Affibody <italic<in vivo</italic< studied with magnetic resonance guided fluorescence recovery in varying orthotopic glioma sizes
Author(s): Robert W. Holt; Jennifer-Lynn H. Demers; Kristian J. Sexton; Jason R. Gunn; Scott C. Davis; Kimberley S. Samkoe; Brian W. Pogue

Paper Abstract

The ability to image targeted tracer binding to epidermal growth factor receptor (EGFR) was studied in vivo in orthotopically grown glioma tumors of different sizes. The binding potential was quantified using a dual-tracer approach, which employs a fluorescently labeled peptide targeted to EGFR and a reference tracer with similar pharmacokinetic properties but no specific binding, to estimate the relative bound fraction from kinetic compartment modeling. The recovered values of binding potential did not vary significantly as a function of tumor size (1 to 33  mm3), suggesting that binding potential may be consistent in the U251 tumors regardless of size or stage after implantation. However, the fluorescence yield of the targeted fluorescent tracers in the tumor was affected significantly by tumor size, suggesting that dual-tracer imaging helps account for variations in absolute uptake, which plague single-tracer imaging techniques. Ex vivo analysis showed relatively high spatial heterogeneity in each tumor that cannot be resolved by tomographic techniques. Nonetheless, the dual-tracer tomographic technique is a powerful tool for longitudinal bulk estimation of receptor binding.

Paper Details

Date Published: 4 February 2015
PDF: 7 pages
J. Biomed. Opt. 20(2) 026001 doi: 10.1117/1.JBO.20.2.026001
Published in: Journal of Biomedical Optics Volume 20, Issue 2
Show Author Affiliations
Robert W. Holt, Dartmouth College (United States)
Jennifer-Lynn H. Demers, Thayer School of Engineering at Dartmouth (United States)
Kristian J. Sexton, Thayer School of Engineering at Dartmouth (United States)
Jason R. Gunn, Thayer School of Engineering at Dartmouth (United States)
Scott C. Davis, Thayer School of Engineering at Dartmouth (United States)
Kimberley S. Samkoe, Thayer School of Engineering at Dartmouth (United States)
Geisel School of Medicine at Dartmouth (United States)
Brian W. Pogue, Thayer School of Engineering at Dartmouth (United States)
Dartmouth College (United States)
Geisel School of Medicine at Dartmouth (United States)


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