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Early-Phase Luciferase Signals of Islet Grafts Predicts Successful Subcutaneous Site Transplantation in Rats

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Abstract

Purpose

The transplantation of pancreatic islets is a promising cell replacement therapy for type 1 diabetes. Subcutaneous islet transplantation is currently under investigation as a means to circumvent problems associated with standard intra-hepatic islet transplantation. As modifications are being developed to improve the efficacy of subcutaneous islet transplantation, it is important to have robust methods to assess engraftment. Experimentally, ATP-dependent bioluminescence imaging using luciferase reporter genes has been effective for non-invasively tracking engraftment. However, it was heretofore unknown if the bioluminescence of subcutaneously transplanted luciferase-expressing islet grafts correlates with diabetes reversal, a primary outcome of transplantation.

Procedures

A retrospective analysis was conducted using data obtained from subcutaneous islet transplantations in Lewis rats. The analysis included transplantations from our laboratory in which islet donors were transgenic rats ubiquitously expressing luciferase and recipients were wild type, streptozotocin-induced diabetic rats. Data from 79 bioluminescence scans were obtained from 27 islet transplantations during the post-transplant observation period (up to 6 weeks). The bioluminescence intensity of the subcutaneously transplanted grafts, captured after the intravenous administration of luciferin, was correlated with diabetes reversal.

Results

After subcutaneous transplantation, islet bioluminescence decreased over time, dropping > 50 % from 1 to 3 weeks post-transplant. Bioluminescence intensity in the early post-transplant phase (1–2 weeks) correlated with the subsequent reversal of diabetes; based on optimized bioluminescence cutoff values, the bioluminescence intensity of islets at 1 and 2 weeks predicted successful transplantations. However, intensity in the late post-transplant phase (≥ 4 weeks) did not reflect transplantation outcomes.

Conclusions

Early-phase bioluminescence imaging of luciferase-expressing islets could serve as a useful tool to predict the success of subcutaneous islet transplantations by preceding changes in glucose homeostasis.

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Acknowledgments

We thank Dr. Eiji Kobayashi for providing the LUC-Tg Lewis rat strain. We also thank Drs. Hsun Teresa Ku, Jeffrey Isenberg, and Kerin Higa for their critical reading and editing of the manuscript.

Funding

This study was supported by a grant from the Nora Eccles Treadwell Foundation (Title of Grant: CURE OF DIABETES, Grant Period: July 1, 2012–June 30, 2020, P.I.: Yoko Mullen, MD, PhD).

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Contributions

H.K. designed the study, collected and analyzed data, and wrote the manuscript; N.G., J.O., and J.R. collected the data; K.O., F.K., and Y.M. reviewed and edited the manuscript.

Corresponding author

Correspondence to Hirotake Komatsu.

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The authors declare that they have no conflict of interest.

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Komatsu, H., Gonzalez, N., Ortiz, J. et al. Early-Phase Luciferase Signals of Islet Grafts Predicts Successful Subcutaneous Site Transplantation in Rats. Mol Imaging Biol 23, 173–179 (2021). https://doi.org/10.1007/s11307-020-01560-2

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  • DOI: https://doi.org/10.1007/s11307-020-01560-2

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