From Zn(II) to Cu(II) Detection by MRI Using Metal-Based Probes: Current Progress and Challenges

Area of Science:

• Medical Imaging
• Biochemistry
• Nanotechnology

Background:

• Zinc and copper are vital cations implicated in various diseases, including neurodegenerative disorders, diabetes, and cancers.
• Accurate detection and quantification of these cations are critical for early disease diagnosis and management.
• Magnetic resonance imaging (MRI) responsive contrast agents offer a promising avenue for non-invasive cation detection.

Purpose of the Study:

• To review the development of MRI contrast agents for detecting Zn2+ and Cu2+.
• To highlight the challenges in achieving selectivity and sensitivity for in vivo cation detection.
• To discuss advancements in MRI techniques and quantification methods for cation-responsive probes.

Main Methods:

• Utilizing Lanthanide(+III) complexes as MRI-responsive contrast agents.
• Exploiting relaxation-based (T1) and paramagnetic induced hyperfine shift (paraCEST, parashift) properties.
• Investigating fast-field cycling MRI for enhanced detection capabilities.

Main Results:

• MRI contrast agents have shown success in detecting Zn2+ and are under development for Cu2+ detection.
• Key challenges include probe selectivity for the target cation and achieving sensitivity at physiological concentrations.
• In vivo applications are emerging, but quantification remains a significant hurdle.

Conclusions:

• Advancements in MRI contrast agents and techniques show potential for in vivo cation detection.
• Overcoming selectivity and sensitivity challenges is crucial for clinical translation.
• Integration with other imaging modalities may be necessary for accurate quantification.