Abstract
Purpose
This study evaluated the use of molecular imaging of fluorescent glucose analog 2-(N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino)-2-deoxyglucose (2-NBDG) as a discriminatory marker for intraoperative tumor border identification in a murine glioma model.
Procedures
2-NBDG was assessed in GL261 and U251 orthotopic tumor-bearing mice. Intraoperative fluorescence of topical and intravenous 2-NBDG in normal and tumor regions was assessed with an operating microscope, handheld confocal laser scanning endomicroscope (CLE), and benchtop confocal laser scanning microscope (LSM). Additionally, 2-NBDG fluorescence in tumors was compared with 5-aminolevulinic acid–induced protoporphyrin IX fluorescence.
Results
Intravenously administered 2-NBDG was detectable in brain tumor and absent in contralateral normal brain parenchyma on wide-field operating microscope imaging. Intraoperative and benchtop CLE showed preferential 2-NBDG accumulation in the cytoplasm of glioma cells (mean [SD] tumor-to-background ratio of 2.76 [0.43]). Topically administered 2-NBDG did not create sufficient tumor-background contrast for wide-field operating microscope imaging or under benchtop LSM (mean [SD] tumor-to-background ratio 1.42 [0.72]). However, topical 2-NBDG did create sufficient contrast to evaluate cellular tissue architecture and differentiate tumor cells from normal brain parenchyma. Protoporphyrin IX imaging resulted in a more specific delineation of gross tumor margins than intravenous or topical 2-NBDG and a significantly higher tumor-to-normal-brain fluorescence intensity ratio.
Conclusion
After intravenous administration, 2-NBDG selectively accumulated in the experimental brain tumors and provided bright contrast under wide-field fluorescence imaging with a clinical-grade operating microscope. Topical 2-NBDG was able to create a sufficient contrast to differentiate tumor from normal brain cells on the basis of visualization of cellular architecture with CLE. 5-Aminolevulinic acid demonstrated superior specificity in outlining tumor margins and significantly higher tumor background contrast. Given the nontoxicity of 2-NBDG, its use as a topical molecular marker for noninvasive in vivo intraoperative microscopy is encouraging and warrants further clinical evaluation.
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Abbreviations
- 2-NBDG:
-
2-(N-(7-nitrobenz-2-oxa-1, 3-diazol-4-yl) amino)-2-deoxyglucose
- 5 ALA:
-
5-Aminolevulinic Acid
- FDG:
-
18F labeled 2-fluoro-2-deoxy-D-glucose
- CLE:
-
Confocal laser endomicroscope
- IV:
-
Intravenous
- PET:
-
Positron emission tomography
- PpIX:
-
Protoporphyrin IX
- RFP:
-
Red fluorescent protein
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Acknowledgments
The authors thank the staff of Neuroscience Publications at Barrow Neurological Institute for assistance with manuscript preparation. We thank Carl Zeiss, AG, Oberkochen, Germany, for providing the LSM 710 confocal laser scanning microscope.
Funding
The Barrow Neurological Foundation and the Newsome Chair in Neurosurgery Research (to MCP). The confocal laser endomicroscope was provided by Zeiss. Zeiss did not have any contribution or effect on the idea, study design, data collection, analysis, or paper preparation.
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Belykh, E., Jubran, J.H., George, L.L. et al. Molecular Imaging of Glucose Metabolism for Intraoperative Fluorescence Guidance During Glioma Surgery. Mol Imaging Biol 23, 586–596 (2021). https://doi.org/10.1007/s11307-021-01579-z
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DOI: https://doi.org/10.1007/s11307-021-01579-z