Reductive microenvironment responsive gadolinium-based polymers as potential safe MRI contrast agents

2019 ◽  
Vol 7 (5) ◽  
pp. 1919-1932 ◽  
Author(s):  
Shiwei Guo ◽  
Xueyang Xiao ◽  
Xiaoming Wang ◽  
Qiang Luo ◽  
Hongyan Zhu ◽  
...  
Keyword(s):  
Contrast Agents ◽  
Retention Time ◽  
Mri Contrast Agents ◽  
Mri Contrast ◽  
Gadolinium Retention

A ROX and enzyme-responsive biodegradable gadolinium-based mCA was prepared, demonstrating a short gadolinium retention time and sufficient MRI contrast efficacy in tumors.

scholarly journals Biological effects of MRI contrast agents: gadolinium retention, potential mechanisms and a role for phosphorus

2017 ◽  
Vol 375 (2107) ◽  
pp. 20170180 ◽  
Author(s):  
Joel Garcia ◽  
Stephen Z. Liu ◽  
Angelique Y. Louie
Keyword(s):  
Molecular Imaging ◽  
Contrast Agents ◽  
Biological Effects ◽  
Blood Pool ◽  
Mri Contrast Agents ◽  
Mri Contrast ◽  
Treatment Regimens ◽  
Gadolinium Retention ◽  
Magnetic Resonance Imaging Mri ◽  
Blood Pool Agents

No discussion of challenges for chemistry in molecular imaging would be complete without addressing the elephant in the room—which is that the purest of chemical compounds needs to interact with a biological system in a manner that does not perturb normal biology while still providing efficacious feedback to assist in diagnosis of disease. In the past decade, magnetic resonance imaging (MRI) agents long considered inert have produced adverse effects in certain patient populations under certain treatment regimens. More recently, inert blood pool agents have been found to deposit in the brain. Release of free metal is often suspected as the culprit but that hypothesis has yet to be validated. In addition, even innocuous agents can cause painful side effects during injection in some patients. In this brief review, we summarize known biological effects for gadolinium- and iron-based MRI contrast agents, and discuss some of the potential mechanisms for the observed biological effects, including the potential role of phosphorus imbalance, related to kidney disease or cancer, in destabilizing gadolinium-based chelates and precipitating free gadolinium. This article is part of the themed issue ‘Challenges for chemistry in molecular imaging’.

scholarly journals The biological fate of gadolinium-based MRI contrast agents: a call to action for bioinorganic chemists

Metallomics ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 240-254 ◽  
Author(s):  
Mariane Le Fur ◽  
Peter Caravan
Keyword(s):  
Contrast Agents ◽  
Chemical Speciation ◽  
Mri Contrast Agents ◽  
Mri Contrast ◽  
Call To Action ◽  
Physical Methods ◽  
Biological Fate ◽  
Gadolinium Retention ◽  
Biological Distribution

Gadolinium retention in tissues: description of our state of knowledge, and physical methods to investigate the biological distribution and chemical speciation of retained gadolinium.

Cubosomes as Carriers for MRI Contrast Agents

2017 ◽  
Vol 24 (5) ◽  
pp. 470-482 ◽  
Author(s):  
Nicolas Alcaraz ◽  
Ben J. Boyd
Keyword(s):  
Contrast Agents ◽  
Mri Contrast Agents ◽  
Mri Contrast

Biocompatible dextran-coated gadolinium-doped cerium oxide nanoparticles as MRI contrast agents with high T1 relaxivity and selective cytotoxicity to cancer cells

2021 ◽  
Author(s):  
Anton Popov ◽  
Maxim Artemovich Abakumov ◽  
Irina Savintseva ◽  
Artem Ermakov ◽  
Nelly Popova ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Contrast Agents ◽  
Mri Contrast Agents ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Resonance Imaging ◽  
Mri Contrast ◽  
Selective Cytotoxicity ◽  
Magnetic Resonance Imaging Mri

Gd-based complexes are widely used as magnetic resonance imaging (MRI) contrast agents. The safety of previously approved contrast agents is questionable and is being re-assessed. The main causes of concern...

scholarly journals Correction to: Magnetic Nanoparticles as MRI Contrast Agents

2021 ◽  
Vol 379 (4) ◽  
Author(s):  
Ashish Avasthi ◽  
Carlos Caro ◽  
Esther Pozo-Torres ◽  
Manuel Pernia Leal ◽  
María Luisa García-Martín
Keyword(s):  
Magnetic Nanoparticles ◽  
Contrast Agents ◽  
Mri Contrast Agents ◽  
Mri Contrast

A correction to this paper has been published: https://doi.org/10.1007/s41061-021-00340-y

One-Step Synthesis of Single-Stranded DNA-Bridged Iron Oxide Supraparticles as MRI Contrast Agents

Nano Letters ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2793-2799
Author(s):  
Jingfang Zhang ◽  
Zhenghan Di ◽  
Husheng Yan ◽  
Yuliang Zhao ◽  
Lele Li
Keyword(s):  
Iron Oxide ◽  
Contrast Agents ◽  
Mri Contrast Agents ◽  
Single Stranded Dna ◽  
Mri Contrast ◽  
One Step

scholarly journals Study on Establishing Reference Safe Concentrations of MRI Contrast Agents for Optimized Images: Paramagnetic Gd-DTPA-BMEA and Superparamagnetic Ferucarbotran

2021 ◽  
Vol 11 (3) ◽  
pp. 1165
Author(s):  
Wen-Tien Hsiao ◽  
Yi-Hong Chou ◽  
Jhong-Wei Tu ◽  
Ai-Yih Wang ◽  
Lu-Han Lai
Keyword(s):  
Contrast Agent ◽  
Contrast Agents ◽  
Mri Contrast Agents ◽  
Mri Contrast Agent ◽  
In Vitro Experiments ◽  
Mri Contrast ◽  
In Vivo Experiments ◽  
Contrast Agent Injection

The purpose of this study is to establish the minimal injection doses of magnetic resonance imaging (MRI) contrast agents that can achieve optimized images while improving the safety of injectable MRI drugs. Gadolinium-diethylenetriamine penta-acetic acid (Gd-DTPA) and ferucarbotran, commonly used in clinical practice, were selected and evaluated with in vitro and in vivo experiments. MRI was acquired using T1-weighted (T1W) and T2-weighted (T2W) sequences, and the results were quantitatively analyzed. For in vitro experiments, results showed that T1W and T2W images were optimal when Gd-DTPA-bisamide (2-oxoethyl) (Gd-DTPA-BMEA) and ferucarbotran were diluted to a volume percentage of 0.6% and 0.05%; all comparisons were significant differences in grayscale statistics using one-way analysis of variance (ANOVA). For in vivo experiments, the contrast agent with optimal concentration percentages determined from in vitro experiments were injected into mice with an injection volume of 100 μL, and the images of brain, heart, liver, and mesentery before and after injection were compared. The statistical results showed that the p values of both T1W and T2W were less than 0.001, which were statistically significant. Under safety considerations for MRI contrast agent injection, optimized MRI images could still be obtained after reducing the injection concentration, which can provide a reference for the safety concentrations of MRI contrast agent injection in the future.

scholarly journals Defining the conditions for the development of the emerging class of FeIII-based MRI contrast agents

2021 ◽  
Author(s):  
Zsolt Baranyai ◽  
Fabio Carniato ◽  
Alessandro Nucera ◽  
Dávid Horváth ◽  
Lorenzo Tei ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Contrast Agents ◽  
Mri Contrast Agents ◽  
Model Systems ◽  
Mri Contrast

An integrated 1H and 17O NMR relaxometric study on model systems allowed to highlight that the Fe(III) complexes might represent the best alternative to Gd-based MRI contrast agents at the magnetic fields of current and future clinical scanners.

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