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Visualizing the target

Metastatic melanoma (skin cancer) has a high mortality rate. Yang et al. designed radiolabeled positron emission tomography and fluorescent imaging probes targeting melanocortin-1 receptor, which is overexpressed in melanoma cells. The probes detected melanoma cells in vitro, in xenografts and mouse models, and in metastases in two patients with melanoma. These results suggest that melanocortin-1 receptor-targeting probes may be useful for melanoma imaging.

Abstract

Melanocortin-1 receptor (MC1R) is a molecular target for melanoma imaging and therapy because of its overexpression on rodent and human melanoma cells. Here, we evaluated the MC1R targeting and specificity of 68Ga-DOTA-GGNle-CycMSHhex and Cy5.5-GGNle-CycMSHhex using murine and human melanoma cells, and murine and xenografted tumors. 68Ga-DOTA-GGNle-CycMSHhex was used first in human as an imaging probe to evaluate the possibility of radionuclide therapy in patients with advanced-stage melanoma. 68Ga-DOTA-GGNle-CycMSHhex and Cy5.5-GGNle-CycMSHhex displayed MC1R-specific targeting properties in murine and human melanoma cells, as well as in murine melanoma and human melanoma–xenografted tumors. Both B16/F10 and M21 melanoma lesions could be easily imaged by positron emission tomography using 68Ga-DOTA-GGNle-CycMSHhex. The first-in-human images of melanoma brain metastases in patients demonstrated the clinical relevance of MC1R as a molecular target for melanoma imaging, highlighting the potential of 68Ga-DOTA-GGNle-CycMSHhex as an MC1R-targeting melanoma imaging probe and underscoring the need to develop MC1R-targeting therapeutic agents for treating patients with metastatic melanoma.
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Published In

Science Translational Medicine
Volume 10Issue 4667 November 2018
PubMed: 30404861

History

Received: 11 June 2018
Accepted: 15 October 2018

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Acknowledgments

We thank F. Gallazzi, L. Cheuy, N. Serkova, and K. Huber for technical assistance and E. R. Prossnitz for helpful discussions. Funding: This work was supported in part by NIH grant number R01CA225837 and the University of Colorado Denver start-up fund. Microscopy imaging experiments were performed in the University of Colorado Anschutz Medical Campus Advance Light Microscopy Core supported in part by NIH/NCATS Colorado CTSI grant number UL1 TR001082. PET imaging experiments were conducted in the University of Colorado Anschutz Medical Campus Animal Imaging Shared Resources supported in part by the University of Colorado Cancer Center (NCI P30 CA046934) and the Colorado Clinical and Translational Sciences Institute (NIH/NCATS UL1 TR001082). Author contributions: J.Y. and J.X. were responsible for the execution of experiments, data collection, and statistical analysis. J.Y. also contributed to manuscript preparation. R.G. contributed to research project organization and execution and review and critique of the manuscript. T.L. contributed to human doses production. C.K. was responsible for first-in-human studies on patients with melanoma, image data interpretation, and review and critique of the manuscript. Y.M. was responsible for research project conception, organization, and execution; contributed to the statistical analysis design and execution; wrote the first draft of the manuscript; and reviewed and edited the final draft of the manuscript. Competing interests: Y.M. is an inventor on awarded U.S. patents (US-8,986,651-B2, US-9,493,537-B2, and US-10,047,135-B2) held by the University of New Mexico that cover compounds with reduced ring size for use in diagnosing and treating melanoma, including metastatic melanoma and methods related to same. The other authors declare that they have no competing interests. Data and materials availability: All data associated with this study are present in the paper. Request for peptides will be handled by the corresponding authors through a licensing agreement (for commercial purposes) or a material transfer agreement (for research and noncommercial purposes).

Authors

Affiliations

Department of Radiology, University of Colorado Denver, Aurora, CO 80045, USA.
Jingli Xu
Department of Radiology, University of Colorado Denver, Aurora, CO 80045, USA.
Rene Gonzalez
Department of Medical Oncology, University of Colorado Denver, Aurora, CO 80045, USA.
Department of Nuclear Medicine, University Hospital Heidelberg, 69120 Heidelberg, Germany.
Department of Nuclear Medicine, University Hospital Heidelberg, 69120 Heidelberg, Germany.
Department of Radiology, University of Colorado Denver, Aurora, CO 80045, USA.

Notes

*Corresponding author. Email: [email protected] (Y.M.); [email protected] (C.K.)

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Science Translational Medicine
Volume 10|Issue 466
November 2018
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Received:11 June 2018
Accepted:15 October 2018
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