Journal
MOLECULES
Volume 25, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/molecules25071709
Keywords
nitroxide radicals; spin probes; organic radical contrast agents; human serum albumin; homocysteine thiolactone; magnetic resonance imaging
Funding
- Russian Foundation for Basic Research [18-53-76003, ST2017-382, 18-04-00393]
- Russian Science Foundation [19-13-00235]
- Ministry of Science and Education of the Russian Federation [14.W03.31.0034]
- German Academic Exchange Service (DAAD)
- Russian Ministry of Education and Science within the program Mikhail Lomonosov
- Russian Science Foundation [19-13-00235] Funding Source: Russian Science Foundation
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Four albumin-nitroxide conjugates were prepared and tested as metal-free organic radical contrast agents (ORCAs) for magnetic resonance imaging (MRI). Each human serum albumin (HSA) carrier bears multiple nitroxides conjugated via homocysteine thiolactones. These molecular conjugates retain important physical and biological properties of their HSA component, and the resistance of their nitroxide groups to bioreduction was retained or enhanced. The relaxivities are similar for these four conjugates and are much greater than those of their individual components: the HSA or the small nitroxide molecules. This new family of conjugates has excellent prospects for optimization as ORCAs.
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