High Yield Production and Radiochemical Isolation of Isotopically Pure Arsenic-72 and Novel Radioarsenic Labeling Strategies for the Development of Theranostic Radiopharmaceuticals
Abstract
Radioisotopes of arsenic are of considerable interest to the field of nuclear medicine with unique nuclear and chemical properties making them well-suited for use in novel theranostic radiopharmaceuticals. However, progress must still be made in the production of isotopically pure radioarsenic and in its stable conjugation to biological targeting vectors. This work presents the production and irradiation of isotopically enriched 72Ge(m) discs in an irrigation-cooled target system allowing for the production of isotopically pure 72As with capability on the order of 10 GBq. A radiochemical separation procedure isolated the reactive trivalent radioarsenic in a small volume buffered aqueous solution, while reclaiming 72Ge target material. The direct thiol-labeling of a monoclonal antibody resulted in a conjugate exhibiting exceptionally poor in vivo stability in a mouse model. This prompted further investigations to alternative radioarsenic labeling strategies, including the labeling of the dithiol-containing chelator dihydrolipoic acid, and thiol-modified mesoporous silica nanoparticles (MSN-SH). In conclusion, radioarsenic-labeled MSN-SH showed exceptional in vivo stability toward dearsenylation.
- Authors:
-
- Univ. of Wisconsin School of Medicine and Public Health, Madison, WI (United States)
- TRACON Pharmaceuticals, Inc., San Diego, CA (United States)
- Univ. of Wisconsin School of Medicine and Public Health, Madison, WI (United States); Univ. of Wisconsin, Madison, WI (United States)
- Publication Date:
- Research Org.:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1467565
- Grant/Contract Number:
- SC0005281; SC0008384
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Bioconjugate Chemistry
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 1; Journal ID: ISSN 1043-1802
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
Citation Formats
Ellison, Paul A., Barnhart, Todd E., Chen, Feng, Hong, Hao, Zhang, Yin, Theuer, Charles P., Cai, Weibo, Nickles, Robert J., and DeJesus, Onofre T. High Yield Production and Radiochemical Isolation of Isotopically Pure Arsenic-72 and Novel Radioarsenic Labeling Strategies for the Development of Theranostic Radiopharmaceuticals. United States: N. p., 2015.
Web. doi:10.1021/acs.bioconjchem.5b00592.
Ellison, Paul A., Barnhart, Todd E., Chen, Feng, Hong, Hao, Zhang, Yin, Theuer, Charles P., Cai, Weibo, Nickles, Robert J., & DeJesus, Onofre T. High Yield Production and Radiochemical Isolation of Isotopically Pure Arsenic-72 and Novel Radioarsenic Labeling Strategies for the Development of Theranostic Radiopharmaceuticals. United States. https://doi.org/10.1021/acs.bioconjchem.5b00592
Ellison, Paul A., Barnhart, Todd E., Chen, Feng, Hong, Hao, Zhang, Yin, Theuer, Charles P., Cai, Weibo, Nickles, Robert J., and DeJesus, Onofre T. Tue .
"High Yield Production and Radiochemical Isolation of Isotopically Pure Arsenic-72 and Novel Radioarsenic Labeling Strategies for the Development of Theranostic Radiopharmaceuticals". United States. https://doi.org/10.1021/acs.bioconjchem.5b00592. https://www.osti.gov/servlets/purl/1467565.
@article{osti_1467565,
title = {High Yield Production and Radiochemical Isolation of Isotopically Pure Arsenic-72 and Novel Radioarsenic Labeling Strategies for the Development of Theranostic Radiopharmaceuticals},
author = {Ellison, Paul A. and Barnhart, Todd E. and Chen, Feng and Hong, Hao and Zhang, Yin and Theuer, Charles P. and Cai, Weibo and Nickles, Robert J. and DeJesus, Onofre T.},
abstractNote = {Radioisotopes of arsenic are of considerable interest to the field of nuclear medicine with unique nuclear and chemical properties making them well-suited for use in novel theranostic radiopharmaceuticals. However, progress must still be made in the production of isotopically pure radioarsenic and in its stable conjugation to biological targeting vectors. This work presents the production and irradiation of isotopically enriched 72Ge(m) discs in an irrigation-cooled target system allowing for the production of isotopically pure 72As with capability on the order of 10 GBq. A radiochemical separation procedure isolated the reactive trivalent radioarsenic in a small volume buffered aqueous solution, while reclaiming 72Ge target material. The direct thiol-labeling of a monoclonal antibody resulted in a conjugate exhibiting exceptionally poor in vivo stability in a mouse model. This prompted further investigations to alternative radioarsenic labeling strategies, including the labeling of the dithiol-containing chelator dihydrolipoic acid, and thiol-modified mesoporous silica nanoparticles (MSN-SH). In conclusion, radioarsenic-labeled MSN-SH showed exceptional in vivo stability toward dearsenylation.},
doi = {10.1021/acs.bioconjchem.5b00592},
journal = {Bioconjugate Chemistry},
number = 1,
volume = 27,
place = {United States},
year = {Tue Dec 08 00:00:00 EST 2015},
month = {Tue Dec 08 00:00:00 EST 2015}
}
Web of Science
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