An Activatable T
| Autor: | Sankarprasad Bhuniya, Jong Seung Kim, Mi Young Cho, Hak Nam Kim, Jongeun Kang, Jonathan L. Sessler, Sanu Karan, Hyunseung Lee, Eunha Hwang, Kwan Soo Hong |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
vicinal thiols
Magnetic Resonance Spectroscopy Gadolinium Pharmaceutical Science chemistry.chemical_element Contrast Media activatable contrast 010402 general chemistry 01 natural sciences Article Analytical Chemistry lcsh:QD241-441 Thioredoxins lcsh:Organic chemistry Cell Line Tumor Drug Discovery Molecule Humans Sulfhydryl Compounds Physical and Theoretical Chemistry MR relaxivity Structural motif chemistry.chemical_classification Gene knockdown 010405 organic chemistry Phantoms Imaging Organic Chemistry thioredoxin 0104 chemical sciences chemistry Chemistry (miscellaneous) Cell Tracking Cancer cell Thiol Biophysics Molecular Medicine Thioredoxin Vicinal |
| Zdroj: | Molecules, Vol 26, Iss 2018, p 2018 (2021) Molecules Volume 26 Issue 7 |
| ISSN: | 1420-3049 |
| Popis: | We have synthesized new magnetic resonance imaging (MRI) T1 contrast agents (CA1 and CA2) that permit the activatable recognition of the cellular vicinal thiol motifs of the protein thioredoxin. The contrast agents showed MR relaxivities typical of gadolinium complexes with a single water molecule coordinated to a Gd3+ center (i.e., ~4.54 mM−1s−1) for both CA1 and CA2 at 60 MHz. The contrast agent CA1 showed a ~140% relaxivity enhancement in the presence of thioredoxin, a finding attributed to a reduction in the flexibility of the molecule after binding to thioredoxin. Support for this rationale, as opposed to one based on preferential binding, came from 1H-15N-HSQC NMR spectral studies these revealed that the binding affinities toward thioredoxin were almost the same for both CA1 and CA2. In the case of CA1, T1-weighted phantom images of cancer cells (MCF-7, A549) could be generated based on the expression of thioredoxin. We further confirmed thioredoxin expression-dependent changes in the T1-weighted contrast via knockdown of the expression of the thioredoxin using siRNA-transfected MCF-7 cells. The nontoxic nature of CA1, coupled with its relaxivity features, leads us to suggest that it constitutes a first-in-class MRI T1 contrast agent that allows for the facile and noninvasive monitoring of vicinal thiol protein motif expression in live cells. |
| Databáze: | OpenAIRE |
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