Molecular imaging contrast media for visualization of liver function.

Area of Science:

• Hepatobiliary imaging
• Molecular imaging
• Biomedical nanotechnology

Background:

• Liver disease diagnosis benefits from advanced imaging.
• Magnetic resonance imaging (MRI) offers radiation-free liver imaging.
• Current MRI methods struggle to detect subtle liver tissue changes or diseased areas.

Purpose of the Study:

• Develop novel contrast agents for visualizing liver functional changes.
• Assess the efficacy of new contrast media for liver molecular imaging.

Main Methods:

• Created molecular imaging contrast media targeting the asialoglycoprotein receptor (ASGP-R) on hepatocytes.
• Evaluated contrast media diameter and cytotoxicity.
• Confirmed ASGP-R binding specificity using confocal microscopy and blocking agents.
• Assessed MRI signal enhancement in hepatocytes using the developed contrast media.

Main Results:

• The contrast media formed 30 nm nanoparticles with low cytotoxicity.
• Demonstrated high specificity for ASGP-R on normal rat hepatocytes in vitro.
• Lactose and anti-ASGP-R antibody blocked media interaction with ASGP-R.
• Significantly enhanced T1-weighted MRI signals in normal hepatocytes compared to liver cancer cells.

Conclusions:

• The developed contrast media is effective for in vitro molecular imaging of hepatocytes via MRI.
• This novel agent shows potential for enhancing the detection and characterization of liver diseases.